Operation and Maintenance Manual
Contents
1. 11 2 11 2 6 3 4 3 4 2 11 2 6 3 4 3h 21 2 21 2 8 1 2 1 1 3 3 8 1 2 1 1 4 4 9 1 1 1 A Std Wt 6 6 10 5 3 1 1 p Pipe Steel 8 8 12 5 1 1 10 8 12 5 1 1 NOTE This information is provided to expedite servicing of FEBCO products See pages 16 amp 19 for instructions on use 1 EM C Milled Notch C x C SO 120 Apart 3 Places 30 a gt N 00 oj gt io N ro a D N 5 N eo d gt N gt io N 4 Wi m E lt 2 2 Z Wi JOU 1nq ejqejie e AjjeroeuJuJoo osje syexseb aBuel 5532021591 91er sJo ie18 JO sIo1nquisip SOW YBNosy AjeioeuuJoo sued eseu 1861 01 Joud peunjoejnueuu seA eA uo pesn sued sejoue f Uf X9 X9 Ek X IL X Y BEX WeLX BEX MeL X vc 9 X 96 X 9 9 X 86 XY 811 899 811 899 911 899 911 899 Y 10 899 Y 10 898 NYNNg 19 v v v p v 5902 541 541 541 Sdl 4 Sdl 4 Sdl 4 Sdl JJ Sdl Al SSVug 1591 Ov 98 70 70 70 ZL c1 ZL INN NE X 69 EX OLY 11586 CX 195 ACX 11586 CX 1196 79315 8109 ZL 91 S1 S1 GL 91 89 9 91 vi VV 91 9 00 4 024 0074 YCA 11515 PANDO SL 2 z 2 4 0 2 A X L X MCL2. 72510 0L L 668 S78 9pOW JPY 10 SEd PWO gt N 00 oj gt io N a D N 00 9 N 00 d N 00 gt io N ro 4 m e lt 2 2 2 1861 O seA e uo pesn sued selousq y pear ued ued peer ued ued peo ued peor ued Malas A X OTI 9 X OT 9 X OT 9 X OTIA 9 X OTA 9 X OTIA 115 15 deg 8v 9S0 X 95019 X Sql 2 95019 X Sql 2 9502 X 1 9S0 X Sd 1 1 9502 X Sdl 9 11515 ejddiN edid 6 05 X 819 9 X 819 X 819 X 819 9 X 819 X 819 115 15 deg 8 0 X 960 9 4 X 860 X 966 X 90 9 X 960 X g 9 0 X SC 9 X 966 X 9C 622 394 620 898 6 899 6 899 6 899 6 899 age Uf X Ve C X Wez OX Vc C X Wez CX Ve C X Iez 6 X VAC X 9060 6 X WAC X 960 Oe X WC X 960 9 1 898 871 898 871 898 GV 1 895 871 898 811 898 BUL O VLE 8 8 8 8 8 8 M S LX 91 3 01 LX 91 3 LX OL LX 91 LX 901 11515 deg GC 98 X9 xv xv XY 98 Xy xv gy Xv 000 894 002 894 000 894 000 894 000 894 000 894 N VNNG VCC OL 8 9 ub uf
3. With this symptom the pressure drop across the c Disc holder stem not moving freely in guide s c Inspect for dirt or other foreign material No 1 check valve would be 2 to 3 PSID If a flow of water more than the discharge is created through the valve the pressure drop should increase to approximately 7 PSID d Damaged seat or seat disc d Inspect and replace Seat disc can be reversed e Leakage at o ring on the seat ring or disc holder e Inspect and replace o ring ERN f Leakage under seat disc due to dirt or damage disc f Inspect and replace or repair mec 9 Leakage through diaphragm due to stretched holes g Inspect and replace diaphragm or cut 825 amp 835YD Intermittent discharge from relief valve during NO FLOW condition With this symptom the pressure drop across the No 1 check valve would b Pressure surges water hammer causing relief be varying from about 2 to 7 PSID through ZONE Continuous discharge from relief valve during FLOW and NO FLOW conditions With this symptom the pressure drop across the stem this can be caused by pressure surges a Inlet line pressure variations causing relief valve a Elimate or reduce pressure variations to discharge b Eliminate or reduce pressure surges valve to discharge as pressure wave passes a Seat disc dislodged from cavity in the in the main a Reposition disc in main stem cavity Repressurize system sl
4. 29 Ball Valve Inlet 1 781 053 781 054 781 055 781 056 781 057 29A Ball Valve Outlet 1 781 048 781 049 781 050 781 051 781 052 30 4 781 074 781 074 781 075 781 075 781 075 Quantity required per valve 14 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825Y 825YR and YA 4 2 Parts Cont Assemblies Kits Model 825Y amp YA SIZE SIZE SIZE SIZE SIZE DESCRIPTION QTY x m ae i Check Valve Rubber Kit 2 ea 8 10 1Kit 905 042 905 042 905 042 905 053 905 053 Relief Valve Rubber 1 ea 17 22 24 25 1 Kit 905 043 905 043 905 043 905 054 905 054 Check Valve Assembly 1 ea 8 9 10 11 12 2Assy 905 044 905 044 905 044 905 055 905 055 Relief Valve Assembly 1 ea 17 18 19 20 21 22 23 34 25 28 27 1 905 045 905 045 905 045 905 056 905 056 RV Seat Ring Kit 101 102 1Ki 905 113 905 113 905 114 905 114 4 Rubber Parts 8 4 5 8 10 17 22 24 dki 905 111 905 111 905 111 905 112 905 112 825YR Seat Ring Repair Kit 35 36 1Kit 905 280 905 280 905 281 905 281 Quantity required per valve Model 825Y 3 2 Figure No 11 Relief Valve Assembly 3 Discharge 19 SES Shield ON iN j Check Assembly Denotes Commercial Parts Available see pages 31 33 T Unit is shown with ball valve shutoffs Some parts are sold in kits only Consult Parts Price List for specifics Model
5. eI249UdUJ07 JOU 1nq ejgejie e AjjeroeuJuJoo osje sjeyseb 5 002169 91er sJo ie18 10 sIo1nquisip SOW Ajeno sued eseu N gt N oj gt Ww N eo a 17 N ro 5 N eo d gt D N 17 N 4 e lt 2 2 zZ lt 1861 JOUd peunjoejnueuJ uo pesn Ajuo sued Sejousq y peisi JOU 1nq AjeinjeuJuJoo osje 949 sjexseD 9x2001se1 5 sJo Ie1eJ 10 sioinquisip 150 ufinoJui AjeroJeuuugo0 eie sued eseu 0 0 0 2 0 0 9 X 9 X tf 94 X 9 X tf 94 X tc X 96 I X tj X 9 9 X 85 X Y 9 X 8 X 21 811 898 811 898 911 898 911 898 710 899 710 899 NVNA8 Lg 921 921 921 921 9215 921 SC LLZ LLS SC LLZ LLS SC LLZ LLS SC LLZ LLS St LLZ LLS 34 eqn 921 9215 9215 9215 9215 921 206 C LE7 LLS 7 LEZ LLS S LET LLS S LET LLS S LET LLS S7 LE7 LLS 34 eqn 9219 9215 9215 9215 9215 921 9 121 18 9 181 18 9 181 1 9 181 18 181 18 ZHLEL LLG giy 0 925 c 9216 c 9215 c ezis c ezis c 9215 amp 181 18 6 181 18 181 1 G t 181 184 t 181 184 t 181 1 G Viv E 925 E
6. 1 1 1 1 1 1 ITEM DESC QTY 21 Cover RV 22 Body RV 22A O ring 22B Bushing 24 Diaphragm Button 25 Capscrew 26 Diaphragm Outer 28 Spring 630 128 630 128 630 128 630 128 630 128 630 128 30 Main Stem 500 298 500 298 500 298 500 298 500 298 500 298 31 Upper Guide 101 114 101 114 101 114 101 114 101 114 101 114 31A O ring 398 145 72 398 145 72 398 145 72 398 145 72 398 145 72 398 145 72 32 Seat Disc 780 395 780 395 780 395 780 395 780 395 780 395 33 Diso Washer 300 119 300 119 300 119 300 119 300 119 300 119 34 Retainer 101 116 101 116 101 116 101 116 101 116 101 116 35 Lower Guide 240 102 240 102 240 102 240 102 240 102 240 102 36 Seat Ring 101 115 101 115 101 115 101 115 101 115 101 115 36A Bushing 1 500 299 500 299 500 299 500 299 500 299 500 299 36B O ring 398 229 72 398 229 72 398 229 72 398 229 72 398 229 72 398 229 72 37 Mountain Plate 1 101 143 101 143 101 143 101 142 101 142 101 142 38 Capscrew 4 511 514 07 511 514 07 511 514 07 511 514 07 511 514 07 511 514 07 39 Nipple 1 573 181 81 573 181 81 573 181 81 573 181 81 573 181 81 573 181 81 48 Capscrew 519 513 04 519 513 04 519 513 04 519 513 04 519 513 04 519 513 04 50 Air Bleed 9594A110 9594A110 9594A110 9594A110 95944110 9594A110 Relief Valve Model 825YD Figure No 18 905 104 Relief Valve Module Denotes Commercial Parts Available see page 31 33 See page 32 for size 26 MAI
7. AXALLX LL 9 X v6 X 746 y 9 X 8X A X yy X AP 9 X v X KE 9 XWe X e 197 898 040 9894 692 894 090 895 770 899 072 894 760 894 NvNng vl v2 91 91 91 91 91 ZL 8 M S l X 01 WX 1196 9 X 9l LX EL 115 15 d9 El 2 2 0 2 2 2 94 X OL X OL X 6 A X VeL XUL X G X AG 9 X ey X Vy 9 X AE X HE 9 X 0 KC AX ACX Wc X 840 640 894 790 8904 792 894 92 895 862 894 62 894 800 894 NYNNg zl 2 Nc 2 LX 91 96 L X 91 9 9 11515 M HS V7 c 2 c 2 2 iN WE vL WP 1 92 81 26 81 819 0cv 11515 Duusng gz 01 8 49 uA ud dl ON 3715 3715 3715 3715 3715 3715 3715 3715 OSA 01 41 SC8 SDOW JO SHEd 8 8 8 8 8 8 8 8 peer 19205 peer 19205 peer 19205 pear 19205 peer 19205 peer 19205 19205 peer 193005 M S y X CEOL X CEOL 4 X CEOL 4X CEOL X CEOL Y X CEOL YX CEOL X CEOL 11515 de 8v E X Vc X AE EX ACX 90 WXNCXAC 9 X TEL X VE 9 X VeL X 4L 9 X Vel X VL 0 8696 0 898 0 898 0 898 000899 040899 046 899 710 894 N VNNG 66 8 8 8 8 8 8 8 8 MN 0 91 4 91 0 91 X 91 96 T X OL 0 91 A T X 91 96 AC X 91 96 11515 9109 OL 8 9 uv 442 wAL ON 3715 3715 3715 3715 3715 3715 3715 3715
8. For standard models not equipped with optional drain plugs loosen the relief valve cover and allow water to drain from both sides of the diaphragm Ball Valve ShutOff Draining Procedure 5a If the assembly has been installed with ball valve shutoff valves they must also be properly drained to prevent freeze damage After draining procedure has been completed on the backflow prevention assembly position all ball valve shut offs and test cocks in a half open half closed 45 degree position see Figure 5 5b Open the ball valve approximately 45 degrees while draining the pipeline and assembly to allow water between the ball and valve body to drain Leave the ball valve in this position for the winter to prevent freeze damage 5c The ball valves must be fully closed before the system is repressurized OPEN AND CLOSE BALL VALVES SLOWLY TO PREVENT DAMAGE TO THE SYSTEM CAUSED BY WATER HAMMER Model 825 8250 and 825YD 21 2 10 Reduced Pressure Zone and Relief Valve Freeze Protection 1 Slowly close supply valve within freeze protected area open ir bleed valves on No 1 check valve and relief valve 3 places and open No 2 and 3 test cocks Water within the zone will be drained to the lowest point of the relief valve discharge port relief valve seat A minor amount of water will remain in the bottom of the valve body but this is not suffi cient to cause freezing damage N With this procedure abou
9. Inspect seat disc for wear or damage Replace with new seat disc or turn used disc over if new disc is not available NOTE The discs are symmetrical It is usually possible to turn the disc over and obtain an effective seal e If the seat disc has been severely cut along the seat disc ring diameter the assembly is being subjected to extremely high back pressure from thermal water expansion water hammer or other causes of excessive water pressure A seat disc damaged in this manner should be replaced and not turned over for reuse d Remove disc holder from stem NOTE On older Model 825 valves the disc holder is sealed to the stem with a sealant If the seal is broken the stem and holder must be cleaned and new sealant applied Newer valves Models 825D and 825YD use an o ring so a sealant is not required Spring Removal Sizes 4 10 See Figures No 15 amp 16 CAUTION TO AVOID POSSIBLE INJURY DO NOT ATTEMPT TO REMOVE SPRING TENSION WITHOUT THE USE OF THE SPRING REMOVAL TOOL SHOWN IN FIGURE NO 20 ON PAGE 30 ON OLDER MODEL 825 VALVES IT IS NECESSARY TO REMOVE THE SPRING BEFORE THE RUBBER SEAT DISC CAN BE REMOVED a Leave check assembly in body b Install long studs in body 180 degrees apart c Place spring removal tool over stud and retain with nuts See Figure No 20 for dimensions MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedures 825 825D and 825YD
10. See Figure No 11 a Close inlet and outlet shut off valves Bleed residual pres sure by opening first the 4 test cock then the 3 and 2 test cocks See Figure No 7 for test cock locations b Unscrew Cap using appropriate size wrench CAUTION Cap is spring loaded First check spring force on 3 4 to 11 2 is 10 Ib First check spring force on 11 2 to 2 is 28 lb Retain cap with appropriate amount of hand force to avoid injury Second check spring force is approximately 1 4 of the first check spring c Remove the spring and disc holder assembly d Inspect guiding bore of the cap and poppet stem for any buildup of calcium or other mineral deposits If this condition exists it may be removed with the careful use of an appro priate size reamer or a thin blade knife 3 41 1 4 5 6250 reamer 11 2 2 cap s 8750 reamer e Check disc holder and stem movement in the guide to ensure they move freely Debris can inhibit proper move ment 2 Check Valve Seat Replacement Model 825Y 4 2 See Figure No 11 a Hold disc holder assembly in one hand and remove screw and disc washer CAUTION The use of pliers or other tools may damage the guiding surfaces and require unnecessary replacement Do not scratch or mark sealing or guiding surfaces b Inspect seat disc for wear or cuts remove old seat disc and install new or turn used disc over if new seat disc is not available NOTE Th
11. that a drip tight closure can be achieved to prevent refilling of the assembly after the freeze protection procedure is performed The unit must be protected from freezing by a heated enclosure draining insulation using heat tape or other suitable means However the unit must always be accessible for testing and maintenance If the system will be shut down during freezing weather use the following procedure to drain internal passages The Model 825YA can be removed from the line as a winterizing procedure See Figure 5 for proper ball valve procedure Model 825Y 3 4 2 Reduced Pressure Zone and Relief Figure No 5 Valve Freeze Protection 1 Slowly close the main shutoff valve upstream of the assembly which provides water to the system 2 Drain system water upstream of the first check by means other than through the assembly Check Valve Draining Procedure 3a First check zone Open 2 and 3 test cocks All water between the first and second check valves will drain through the relief valve port 3b Second check downstream Remove the second check cap spring and disc holder All water downstream of the second check that is higher than the outlet shutoff valve will drain through the body Relief Valve Draining Procedure 4a If device is equipped with optional drain plugs remove plugs in the relief valve cover and body Open 2 and 3 test cocks All water will drain through plug holes 4b
12. 1 Thin blade knife or reamer 1 Socket 1 2 and 9 16 size Differential pressure test kit FDA approved lubricant Needle nose pliers Model 825 825D 825YD 21 2 10 1 Crescent wrench 127 1 Medium Phillips screw driver 1 Medium straight blade screw driver 1 Set of drive sockets 3 8 or 1 2 1 Spring removal tool see page 33 1 Torque wrench Differential pressure test kit FDA approved lubricant MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Troubleshooting Procedure With Differential Pressure Gauge SYMPTOM NO 1 CHECK DIFFERENTIAL ACROSS NO 1 CHECK VALVE mo O OS 2to 3 PSID Leak in No 1 or With Differential Pressure Gauge SYMPTOM NO 2 CHECK DIFFERENTIAL ACROSS NO 1 CHECK VALVE 2to 3 PSID Leak in No 1 or No 2 check valve 6 to 8 PSID and steady Malfunctioning pressure relief valve Troubleshooting Guide Without Differential Pressure Gauge SYMPTOMS NO 1 AND NO 2 A Close Gate Valve No 2 B Open No 4 testcock to produce a flow greater than If discharge stops Leak in No 1 check valve If discharge does not stop Malfunctioning pressure relief valve 1 Continuous discharge from relief valve during a Debris fouling No 1 check valve a Inspect and clean NO FLOW condition discharge stops with water b Outlet pressure higher than inlet pressure and b Inspect and clean flow debris fouling No 2 check valve
13. 2 10 the model number is located on the name plate On small assemblies 3 4 27 the model number is cast on the body Identify the type code on 21 2 10 size valves Ductile Iron bodies use Type D or YD code on name plate 4 5 6 serial number located on the D plate will assist in ordering the proper kits 7 Some parts are sold only in kit form Give part number Provide new part number if appropriate CERTIFIED A Division of Watts Water Technologies Inc USA 4381 N Brawley Ste 102 Fresno CA e 93722 e Tel 559 441 5300 Fax 559 441 5301 www FEBCOonline com Canada 5435 North Service Rd Burlington ONT L7L 5H7 Tel 905 332 4090 e Fax 905 332 7068 www FEBCOonline ca IOM F 825_826 0829 FEBCO 2008
14. 4 10 Continued d Un thread capscrew Item 7A using 2 6 hex socket e Release spring tension by un threading nuts on long studs Use alternating turns to keep tool parallel to valve body f Remove spring guide and stem assembly g Remove guide bushing by un threading 4a Valve Seat Removal Sizes 4 10 Threaded in Seat Ring Type Model 825 See Figure No 13 4b Valve Seat Removal Sizes 4 10 Bolted in Seat Ring Type Model 825D and 825YD See Figure No 14 1 Remove check valve as described above 2 Remove the three capscrews and washers retaining the seat ring 3 Pull the seat ring from the valve body 4 Un thread the bushing Item 2A from the seat ring 5 Remove the o ring Valve Seat Reassembly Sizes 4 10 Threaded in Seat Ring Type Models Model 825 See Figure No 13 1 Remove check valve as described above 2 Remove seat ring by un threading in the counterclockwise direction For ease of removal Figure No 21 on page 30 defines a simple tool for this purpose 3 Remove bushing and bushing nut if used bushing and nut is used on older Model 825 4 Remove o ring 1 Lubricate o ring with FDA approved lubricant Reposition the o ring in the seat ring groove 2 Replace the bushing and bushing nut if used in the seat ring the bushing and nut is used on older Model 825 3 Thread the seat ring into the seating area in a clockwise direction Be careful
15. 4246 ON 3715 3715 3715 3715 3715 3715 enaze 72530 401 210 CIASC9 JOHAN 40 Steg 2 920 898 920 898 610 898 610 898 NYNNE 001 Sdl Sdl J Sdl 54 Sdl 34 3ZNOU8 2002 1591 0 5541 4 deL Sdl A de 554 4 deL epis 541 4 de epIS 541 7 4ZNOUS de epis LdN c Zl ul ldN 3ZNOU8 9182 6c Sdl Sdl J Sdl 8A Sdl 91 Sdl 81 SSvdg Bid 8 peeH punoy punoy punoy 0 X 0C A X 0C X CEOL 96 X CEOL 96 X c 0l 115 LS LC 161 894 461 894 000 894 620 895 60 894 NYNNE vC 021 895 021 895 11 898 11 898 11 898 18H 208 18H 208 Pes 16H 208 Pes 16H 208 pes 115 208 X OC 96 X OC X OCA X OCA Y X OC 7116 15 M S 8l peer peo peor peor peer 9 X 91 3 9 X 91 96 Ve X 81 96 Ve X 81 98 Ve X 8194 115 LS 109 Gl pesH ued ued peaH Uld peaH ued ued 86 X 82 7 96 X 8T 86 X 8C 86 X 8C 9c X 80 7 115 15 Melos cl 9 899 9 899 9 899 9 899 922 394 N VNNG 8 Pes pes uel pes pes uay peeH Melos Vc X 81 8 ye X gL3va 86 X 06 7 86 X OCT 96 X OT 115 15 deg 9 000 894 000 894 000 894 002 894 002 894 N VNNG v uc VAL wAL ub 4 ON 3715 3715 3715 3715 3715 Jeue3e u 725304 10 79 9A A JOJ
16. 925 E 925 E 925 E 925 E 925 99 181 18 99 181 1 9 99 181 1 9 181 1 9 181 1 9 181 1 9 ejddiN lv p t t t t v 3202 Sdl Sdi Sdi 54 4 54 4 54 4 SSvu8 1s0 Ov 98 72 70 70 cL ZL MN HEX 6 9 EX OL X 0L ATX 11586 C X 186 AC X 1586 14315 109 i 91 91 91 91 91 91 1 9 vl 9 96 91 02 4 02 7 11515 11 901 9 0 2 0 0 2 c WeX BTL X CE 9e X 9eLLX LL 9 X 966 X 46 XALX L eX 448 X 819 9 X Hy X AY 18 899 61 899 7 9 899 596 890 756 894 976 899 vl 91 91 91 91 91 91 M8JoS Vel X OL V X Ol w 7 X L1 96 LX ELA LX ploy LX ploy 11515 de9 l 0 0 0 0 0 0 9 XV0LOL A X 46X7 6 9 Xu XL 9 X 869 X G 9g Xu 84 X BEE X BE 717 804 217 890 92 806 GZ 89G 72 895 190 899 ZL 0 0 0 0 LX 91 36 LX 91 86 L X 91 86 L X 91 11515 195 VL 9 9 9 9 9 9 8196 e X 81 2 e X 81 96 e X 81 96 4 X OZ 4 X OTI 115 15 M9J9S az OL 8 9 V uf 44 4 ON 3715 3715 3715 3715 3715 3715 2534 w 0L Ac GASC8 9 41458 9pOW 10 Seg co MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD How to Order Repair Parts 1 Locate item number and kit number in this maintenance manual 2 3 Verify the size of the valve the parts are to be used on Provide full model number On large assemblies 21
17. Valve Inspection Repair Model 825Y 3 4 2 See Figure No 11 a Slowly close the inlet and outlet shutoff valves and bleed off the residual pressure by opening first test cocks 4 then 3 and 2 See Figure No 7 for test cock locations b Remove capscrews diaphragm cover diaphragm and port bushing of relief valve c Remove the integral relief valve assembly by pulling straight out of the body to remove the internal assembly d Remove the disc washer and seat disc by unthreading the screw e To remove spring and or main stem from the guide keep unit compressed and remove the screw item 18 located in the center of the button Push the main stem through the guide and remove the o ring from the main stem Inspect and clean or replace o ring and seat disc as required Clean all parts thoroughly with clean water before reassembly 12 5 Relief Valve Seat Removal Model 825Y G 4 2 Standard only on units manufactured after October of 1988 with serial numbers higher than listed below See Figure No 11 for exploded view of this relief valve Serial 5 of new Model 825Y with replaceable valve seat ring 1 4 Serial No 56528 and above 1 Serial No S6163 and above 11 2 Serial No 55710 and above 2 Serial No S5089 and above a While relief valve is disassembled remove the two Allen head socket capscrews using the appropriate sized Allen head wrench 3 1 Allen head wrench for 3 4 and 1 assem blie
18. and a minimum of 18 horizontal clear ance around the unit for access and ease of testing and maintenance of the relief valve Approval agencies do not recommend installation of a Reduced Pressure Assembly in a pit Flooding of the pit can result in cross connection contamination If local codes permit installation of a Reduced Pressure Assembly in a pit adequate drainage must be provided to prevent the pit from flooding under maximum discharge conditions Placement of the assembly should be planned where water discharged from the relief port will not be objectionable or cause damage to property and or equipment To be approved by the University of Southern California Foundation for Cross Connection Control and Hydraulic Research USC the assembly must be purchased and installed with resilient seated shutoffs to ensure bubble tight closure for more consistent results during testing CAUTION Open and close resilient seated shut offs slowly to prevent water hammer damage to the system and assembly Since the FEBCO Reduced Pressure Assembly is designed to be serviced while in line the unit need not be removed from the line during servicing Ensure the supply water pressure does not exceed the manu facturer s maximum water pressure rating of the assembly to avoid damage to the system or the assembly caused by sys tem pressure In addition protection must be provided against thermal water expansion extreme backpres
19. approved lubricant and replace in Seat ring 2 Thread bushing into seat ring 3 Place the seat ring carefully into body and retain with three capscrews and washers being careful not to damage the internal epoxy coating of valve a Position the disc in the cleaned holder and retain with disc washer Insert stem into disc holder replace the nut on stem and tighten NOTE On older Model 825 valves the disc holder is sealed to the stem with a sealant If the seal is broken the stem and holder must be cleaned and new sealant applied Newer valves Models 825D and 825YD use an o ring so a sealant is not required b Thread bushing into cover c Carefully place stem of check assembly into seat ring bush ing Replace spring centering diameter on the disc washer NOTE Be sure the heavier spring 6 psi is placed in first check and lighter spring 2 psi is placed in second check or the unit will not operate properly and discharge from the relief valve could occur The wire diameter is visibly thicker on the heavier spring and thinner on the lighter spring Care should be taken to avoid damaging internal epoxy coating of valve d Place cover on check body securing spring and stem into cover e Bolt cover onto check body while holding cover in place with appropriate hand force Spring will be retained in body by cover f Slowly open inlet shutoff valve Bleed air from valve by opening first the 4 test cock then the
20. not to damage internal epoxy coated surfaces 5b Valve Seat Reassembly Sizes 4 10 Bolted in Seat Ring Type Models Model 825D and 825YD See Figure No 14 1 Lubricate o ring with FDA approved lubricant Reposition the o ring in the seat ring groove 2 Thread the bushing into the seat ring 3 Place the seat ring carefully into the valve body and retain with three capscrews and washers being careful not to damage the internal expoxy coated surfaces 6 Check Valve Reassembly Models 825 825D and 825YD a Use reverse procedure for assembly b Make sure the o ring is properly placed in the groove Do not force the cover into the body c Do not damage epoxy coated surfaces d Test unit to ensure proper operation MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 21 2 10 Parts Check Valve Body Model 825 ITEM SIZE SIZE SIZE SIZE SIZE SIZE NO DESCRIPTION QTY 2 4 3 4 6 8 10 2 Seat Ring 2 780 273 780 274 780 275 780 276 780 277 780 278 2A Bushing 2 780 280 780 280 780 281 780 281 780 282 780 282 3 Guide 22 00000000 190 001 190 002 190 003 190 004 4 Cover 2 780 306 780 307 780 308 780 309 780 310 780 311 4A Bushing 2 780 312 780 312 780 313 780 313 780 313 780 313 5 Disc Holder 2 190 013 190 014 190 005 190 006 190 007 190 008 6 Disc Washer 2 190 016 190 017 190 009 190 010 190
21. 0 905 100 905 101 905 101 905 101 Relief Valve Kit Rubber 26 27 27 31A 32 905 102 905 102 905 102 905 102 905 102 905 102 Relief Valve Seat Ring Kit 22 22B 36 36A 36B 905 103 905 103 905 103 905 103 905 103 905 103 Internal Modular Assembly Relief Valve Kit 905 104 905 104 905 104 905 104 905 104 905 104 Check Assembly 4 10 825D and 825YD Figure No 15 Spring Assembly Check 1 905 085 or 905 087 Check 42 905 086 or 905 088 Cover and Check 21 2 3 825D and 825YD Figure No 16 24 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 and 825D 2 5 10 Parts Relief Valve Body Model 825 amp 825D ITEM SIZE SIZE SIZE SIZE SIZE SIZE HO DESCRIPTION s a p B m s 21 Diaphragm Cover 1 780 372 780 372 780 372 780 372 780 372 780 372 23 Diaphragm Spacer 1 780 377 780 377 780 377 780 377 780 377 780 377 24 Diaphragm Button 1 780 379 780 379 780 379 780 379 780 379 780 379 25 Bolt 8 511 515 22 511 515 22 511 515 22 511 515 22 511 515 22 511 515 22 25A Nut 8 521 515 00 521 515 00 521 515 00 521 515 00 521 515 00 521 515 00 26 Diaphragm 1 780 381 780 381 780 381 780 381 780 381 780 381 27 Diaphragm 1 780 383 780 383 780 383 780 383 780 383 780 383 28 Spring 1 780 385 780 385 780 386 780 386 780 386 780 386 29 Spring Button 1 780 388 780 388 780 389 780 389 780 389 780 389 1 1 1 1 1 1 1 8 2 30 Main Stem 780 391 780 391 780 392 780 392 780 39
22. 011 190 012 7 Stem 2 780 332 780 333 780 334 780 335 780 336 780 337 Screw 22 0 000000000 511 515 08 511 515 08 511 515 08 511 515 08 7B Washer 2 2 780 338 780 338 780 338 780 338 9 Spring Outlet 780 341 780 342 780 343 780 344 780 345 780 346 10 Spring Inlet 780 349 780 350 780 351 780 352 780 353 780 354 11 Seat Disc 2 780 357 780 358 780 359 780 360 780 361 780 362 12 O ring 2 398 238 72 398 246 72 398 254 72 398 264 72 398 273 72 780 095 13 Capscrew 16 511 516 08 511 516 08 511 517 08 511 519 12 511 520 12 13 Capscrew 24 511 520 14 14 O ring 2 398 244 72 398 252 72 398 263 72 398 272 72 398 451 72 740 102 15 Locknut 2 521 547 00 521 547 00 521 550 00 521 550 00 521 551 00 521 551 00 16 Gasket 3 780 365 780 366 780 367 780 368 780 369 780 370 17 Bolt 12 511 019 18 511 019 20 ane 17 Bolt 24 9 0000000 521 019 22 521 020 26 521 020 28 17 Bolt 36 w2Z m 0 000000 000000 0 m 0 0000 em 511 021 30 17A Nut 12 521 019 00 521 019 00 wee fm 17A Nut 24 000000 521 019 00 521 020 00 521 020 00 17A Nut 36 rrr ene en 521 021 00 40 Plug Cock 4 781 047 781 047 781 047 781 048 781 048 781 048 41 Nipple 4 571 181 44 571 181 44 571 181 44 571 181 55 571 181 55 571 181 55 50 Air Bleed 4 9594 110 9594A110 9594A110 9594A110 9594A110 9594 110 51 O ring 2 398 014 72 398 014 72 398 116 72 398 116 72 398 118 72 398 118 72 121 Relief Valve Assem 1 902 440L 902 440L 902 446L 902 4
23. 190 012 T Stem 2 780 332 780 333 780 334 780 335 780 336 780 337 Screw 2 2 511 515 08 511 515 08 511 515 08 511 515 08 7B Washer 2 0 0 000000000 780 338 780 338 780 338 780 338 9 Spring Outlet 780 341 780 342 780 343 780 344 780 345 780 346 10 Spring Inlet 780 349 780 350 780 351 780 352 780 353 780 354 11 Seat Disc 2 780 357 780 358 780 359 780 360 780 361 780 362 12 O ring Seat Ring 2 398 237 72 398 242 72 398 253 72 398 263 72 398 272 72 398 274 72 13 Capscrew 16 24 511 516 08 511 516 08 511 517 10 511 519 12 511 520 12 511 520 14 14 O ring Cover 2 398 346 72 398 354 72 398 365 72 398 374 72 398 379 72 398 381 72 15 Locknut 2 521 547 00 521 547 00 521 550 00 521 550 00 521 551 00 521 551 00 16 Gasket 3 780 365 780 366 780 367 780 368 780 369 780 370 17 10 511 019 18 511 019 20 5 17 Bolt 18 0 511 019 22 511 020 26 511 020 28 17 Bolt 36 were eee wee 511 021 30 17 Nut 14 521 019 00 521 019 00 17 Nut 30 521 019 00 521 020 00 521 020 00 17A Nut 36 c 00000 0 0200 521 021 00 17B Stud 2 513 019 26 513 019 26 5 17B Stud 6 513 019 26 513 020 32 513 020 32 39 1 573 181 81 573 181 81 573 181 81 573 183 11 573 183 11 573 183 11 40 Plug Cock 4 781 047 781 047 781 047 781 048 781 048 781 048 41 Nipple 3 571 181 44 571 181 44 571 181 44 571 181 55 571 181 55 571 181 55 41A Nipple 2 571 181 43 571 181 43
24. 2 780 392 32 Seat Disc 780 395 780 395 780 395 780 395 780 395 780 395 33 Disc Washer 780 397 780 397 780 398 780 398 780 398 780 398 35 Orifice Bolt 780 399 780 399 780 399 780 399 780 399 780 399 36 Ring 825 780 402 780 403 780 404 780 404 780 405 780 405 36 Ring 8250 780 403 780 403 780 403 780 404 780 405 780 405 39 O rin 398 222 72 398 222 72 398 330 72 398 330 72 398 330 72 398 330 72 48 49 Daphragm Washer 700 137 700 137 700 137 700 137 700 137 700 137 780 415 780 415 780 415 780 415 780 415 780 415 Quantity required per valve Relief Valve Assembly Model 825 and 825D Figure No 17 Denotes Commercial Parts Available see page 31 33 25 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 Type YD 21 2 10 Parts Relief Valve Body Model 825YD SIZE SIZE SIZE SIZE SIZE SIZE 2 3 4 6 8 10 1 101 113 101 113 101 113 101 113 101 113 101 113 1 101 112 101 112 101 112 101 112 101 112 101 112 1 398 202 72 398 202 72 398 202 72 398 202 72 398 202 72 398 202 72 1 500 290 500 290 500 290 500 290 500 220 500 290 1 300 118 300 118 300 118 300 118 300 118 300 118 8 511 515 08 511 515 08 511 515 08 511 515 08 511 515 08 511 515 08 1 400 108 400 108 400 108 400 108 400 108 400 108 27 Inner 1 400 109 400 109 400 109 400 109 400 109 400 109 27 Ring 1 340 103 240 102 340 103 340 103 340 103 340 103 1 1
25. 3 2 and 1 test cocks and air bleeds on all covers See Figure No 8 for test cock locations g Slowly open outlet shutoff valve and return the valve to ser vice h Test the assembly to ensure it is operating properly 1 Check Valve Disassembly Sizes 4 10 See Figures No 15 amp 16 a Slowly close outlet gate valve then slowly close inlet gate valve Bleed residual pressure by opening first the 4 test cock then 3 and 2 test cocks See Figure No 8 for test cock locations b Remove cover bolts and cover Unscrew bolts uniformly to avoid binding of the cover The spring will push the cover approximately 1 2 inch off the top of the valve body 2 Seat Disc Removal Sizes 4 10 CAUTION The newer model 825 cast iron units have threaded disc holders with four 4 cast lugs 6 lugs on 10 assemblies 1 2 high located on back side outside the spring diameter If the Model 825 you are servicing does not have these lugs SPRING TENSION MUST BE RELEASED BY USING THE SPRING REMOVAL TOOL BEFORE FURTHER DISASSEMBLY DO NOT ATTEMPT TO REMOVE SPRING TENSION ON OLDER MODEL 825s WITHOUT THE USE OF THIS TOOL SEE SPRING REMOVAL INSTRUCTIONS Newer Models 825 825D and 825YD assemblies have the disc holder threaded on the stem Therefore the seat disc can be removed without releasing spring tension on these newer models a Un thread retaining nut from stem and remove disc washer and seat disc 18 b
26. 46L 902 446L 902 446L Quantity required per valve Shutoffs Model 825 ITEM SIZE SIZE SIZE SIZE SIZE SIZE HO DESCRIPTION Qu oo ae B g de 42 Resilient Sealed NRS Inlet 781 005 781 006 781 007 781 008 781 009 781 010 42 Resilient Sealed OS amp Y Inlet 780 891 780 893 780 895 780 897 780 899 780 901 42A Resilient Sealed NRS Outlet 781 011 781 012 781 013 781 014 781 015 781 016 42A Resilient Sealed OS amp Y Outlet 780 890 780 892 780 894 780 896 780 898 780 900 Quantity required per valve PO PP n5 20 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 2 5 10 Parts Continued Assemblies Kits Model 825 SIZE SIZE SIZE SIZE SIZE SIZE DESCRIPTION 21 2 3 4 6 8 10 Relief Valve Assembly 121 825 905 526 905 100 905 101 905 101 905 522 905 522 825D 905 100 905 100 905 100 905 101 905 522 905 522 Spring Assembly 1 Check _ _ 3 4 5 6 7 7A 10 11 15 51 905 085 905 087 902 466 902 468 902 470 902 472 Spring Assembly 2 Check _ 7 3 4 5 6 7 7A 7B 9 10 11 15 51 905 086 905 088 902 467 905 469 902 471 902 473 Seat Ring Kit 2 2A 12 902 386 902 385 902 384 902 383 902 382 902 381 Rubber Parts Cl amp DI Boddies 11 14 51 905 059 905 060 905 061 905 062 905 063 905 064 Relief Valve Kit Rubber Parts 26 27 32 39 49 2 ea 905 066 905 066 905 067 905 067 905 067 905 067 LG Mounting
27. 571 181 43 571 181 538 571 181 53 571 181 53 41B 571 131 42 571 131 42 571 131 42 571 131 52 571 131 52 571 131 52 43 Tube Fitting 90 1 571 231 28 571 231 23 571 231 23 571 231 23 571 231 23 571 231 23 43 Tube Fitting 1 571 211 23 571 211 23 571 211 23 571 211 23 571 211 23 571 211 23 50 Air Vent 4 9594A110 9594A110 9594A110 9594A110 9594A110 9594A110 51 O ring 2 398 014 72 398 014 72 398 116 72 398 116 72 398 118 72 398 118 72 Quantity required per valve See Page 24 for Assemblies and Kits Shutoffs Model 825D amp 825YD ITEM SIZE SIZE SIZE SIZE SIZE SIZE NO obse inca 25 3 4 6 8 10 42 Resilient Sealed NRS Inlet 781 005 781 006 781 007 781 008 781 009 781 010 42 Resilient Sealed OS amp Y Inlet 780 891 780 893 780 895 780 897 780 899 780 901 42A Resilient Sealed NRS Outlet 781 011 781 012 781 013 781 014 781 015 781 016 42A Resilient Sealed OS amp Y Outlet 780 890 780 892 780 894 780 896 780 898 780 900 22 Parts List continued on page 24 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825D and 825YD 27 gt 10 Figure No 14 121 AL Relief Valve for Model 825YD see Figure No 18 on page 26 for exploded view Denotes Commercial Parts Available see page 31 33 Some parts are sold in kits only Consult Parts Price List for specifics 23 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 Type D YD 2 10 Pa
28. 825YA 2 Figure No 12 104 O ring 103 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedures 825 825D 825YD and 826YD 2 5 3 1 Check Valve Disassembly Models 825 825D Valve Seat Removal Sizes 22 3 and 825YD Sizes 2 2 3 See Figure No 13 Threaded in Seat Ring Type Models a Slowly close outlet shutoff valve and inlet shutoff valve Model 825 See Figure No 13 Bleed residual pressure by opening 4 3 and 2 test 1 Remove seat ring by un threading in counterclockwise cocks See Figure No 8 for test cock location direction being careful not to damage the internal epoxy b Remove cover bolts uniformly while holding cover in place coating in valve A tool to aid in this process is described in Remove cover Figure No 21 on page 30 CAUTION Spring is retained in body by cover c Lift check assembly from body being careful not to damage internal epoxy coating d If necessary un thread bushing item 4A from cover 2 Remove bushing and bushing nut item 2A amp 2B 2 Check Assembly Repair Models 825 825D 3 Remove o ring and 825YD Sizes 21 2 3 See Figures No 15 amp 16 a Un thread nut on stem and remove disc washer and seat disc b Inspect seat disc for wear or damage Replace with new seat disc or turn used disc over if new disc is not available NOTE The discs are symmetrical It is usually possible to turn the disc over and
29. IOM F 825_826 INSTALLATION OPERATION MAINTENANCE Operation and Maintenance Manual Reduced Pressure Backflow Prevention Assemblies Models 825Y 825YA 825 825D 825YD amp 826YD Series 825YA TABLE OF CONTENTS Features and Operating Procedures 2 Installation 2 3 Freeze Protection Procedures 4 Vandalism Protection Procedures 5 General Service 6 Troubleshooting Procedures and Guide 7 8 Field Testing Procedures cor Poe UPS 9 10 Service Procedures Model 825Y 8 4 2 11 12 13 Parts Lists and Part Numbers Model 825Y 8 4 2 14 15 Exploded View of Model 825Y 9 29 15 Service Procedures Models 825 825D and 825YD 2 2 3 16 17 Service Procedures Models 825 825D and 825YD 4 10 18 19 Parts Lists and Part Numbers Model 825 272 107 20 21 Exploded View of Model 825 21 2 10 21 Parts Lists and Part Numbers Models 8250 and 825YD 22 Exploded View Models 825D and 825 23 Parts List and Exploded View of Model 825D and 825YD Check Assembly 24 P
30. Kit 16 17 17A 40 41 Both Ends 905 036 905 037 905 038 905 039 905 040 905 041 825YD Relief valve is used for replacement See Figure 18 on page 26 for details Quantity required per valve Model 825 21 10 Cast Iron Body Figure No 13 121 Relief Valve for Model 4 10 Only 825YD Disc Holder amp Spring see Figure No 17 on page Assembly for 21 23 25 for exploded view see Figure No 14 1 1A Body Denotes Commercial Parts Available see pages 31 33 Some parts are sold in kits only Consult Parts Price List for specifics 21 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825 Type D and YD 27 2 10 Parts Check Valve Body Model 825D amp 825YD ITEM SIZE SIZE SIZE SIZE SIZE SIZE NO DESCRIPTION Hes af 2 B n 2 Seat Ring 2 101 145 101 144 101 136 101 137 101 138 101 139 2A Bushing 2 500 291 500 291 500 292 500 292 780 282 780 282 2C Washer 6 360 079 360 079 360 078 360 078 360 078 360 078 2D Capscrew 6 519 513 04 519 513 04 511 514 06 511 514 06 511 514 06 511 514 06 3 Guide 22 0000000000 190 001 190 002 190 003 190 004 4 Cover 2 902 497 902 498 902 499 902 500 902 501 902 502 4A Bushing 2 780 312 780 312 780 313 780 313 780 313 780 313 5 Disc Holder 2 190 013 190 014 190 005 190 006 190 007 190 008 6 Disc Washer 2 190 016 190 017 190 009 190 010 190 011
31. NTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 826 YD 2 5 10 Parts Relief Valve with Bypass Model 826YD REF SIZE SIZE SIZE SIZE SIZE SIZE NO DESCRIPTION 3 4 6 8 10 9 1stCheck Spring 780 349 780 350 630 142 630 143 630 144 630 145 9 2nd Check Spring 630 140 630 141 780 778 780 779 780 780 780 781 Resilient Wedge 42 OS amp Y Gate 1 780 891 780 893 780 895 780 897 780 899 780 901 61 Bypass Kit 905 127 905 127 905 127 905 127 905 127 905 127 61B Meter Std Gal 780 666 780 666 780 666 780 666 780 666 780 666 The following information combined with the information in this Manual gives you all the necessary technical information for the 826YD For information on Installation Servicing Field Testing and Trouble Shooting please refer to those section in this Maintenance Manual The items listed above are used only on the Model 826YD and are not interchangeable with the Model 825YD Model 826YD Figure No 19 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedures Relief Valve 825 825D and 825YD 27 2 10 1a Relief Valve Disassembly Non Modular Type Relief Valve Models 825 and 825D See Figures No 13 and 17 zx Remove copper tubing from relief valve body Un thread the relief valve completely from the check valve body leaving the seat ring in the check valve body NOTE If the seat ring
32. a with FDA avpproved lubricant Insert the relief valve module into relief valve body using your fingers to help guide the lower guide into the bushing Item 36a on the relief valve seat ring Push the module straight in DO NOT TWIST 5 If the relief valve module does not have a center label piece cov ering the screw Item 48 inspect the screw for burrs If a burr is visible remove or cover burr with a piece of flexible tape This will protect the surface of the diaphragm 6 Replace the diaphragm placing the fabric side against the button Work the rolled edge into the space between the module and the body making sure it is not pinched or buckled 7 Replace the cover tighten the cover bolts and reconnect the sensing tubing Return to service and test the assembly to ensure proper operation MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedures Relief Valve 825 825D and 825YD 27 2 10 Cont 4a Relief Valve Seat Ring Replacement Modular Type Relief Valve Model 825YD See Figures No 14 amp 18 1 Disconnect sensing tubing Loosen and remove the four mount ing bolts Item 38 from the adapter Remove the relief valve 2 Pull the seat ring Item 36 out from the relief valve body and inspect for damage Replace as required 3 Reposition the relief valve to the adapter insuring the o ring Item 36b is properly positioned Tighten the mounting bolts 4 Reconnect
33. arts List and Exploded View of Model 825 and 825D Relief Valve 25 Parts List and Exploded View of Model 825YD Relief Valve 26 Parts List and Exploded View of Model 826YD Relief Valve and Bypass 27 Service Procedure Relief Valve Models 825 825D and 825YD 21 2 10 28 29 Spring Removal Tool Instructions Model 825 2 10 30 Commercially Available Parts Lists 31 32 33 HOW To Order Parts be be ere oad Ubera erga 34 Read and understand this manual prior to installing operating or servicing this equipment MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Feature and Operating Procedures Reduced Pressure Backflow Preventer FEBCO manufactures several models of Reduced Pressure Backflow preventers The Model 825Y 825YA are available in sizes 3 4 2 with bronze body and cover as standard Other materials are avail able The FEBCO Model 825 sizes 21 2 10 were manufactured with cast iron The FEBCO Model 825 Type D and 825 Type YD sizes 21 2 10 are manufactured with standard body material of ductile iron The FEBCO Reduced Pressure Backflow preventer assembly con sists of two independently operating spring loaded check valves with a pressure differential relief valve located between the two checks The pressure drop across the first check valve is approxi Model 825Y 3 4 2 Figure No 1 mately 6 0 psid with no flow T
34. ate the retainer threads using an FDA approved lubricant and thread the retainer onto the upper guide Tighten to 60 inch lbs of torque Insert the main stem into the diaphragm and roll the diaphragm into position by grasping the end of the diaphragm and main stem with one hand and push the upper guide towards your other hand Test to make sure diaphragm is positioned properly by sliding the upper guide back and forth through the full travel It must move freely and easily O1 N co Once the inner diaphragm has been rolled force the end of the main stem snug against the end of the inner diaphragm The screw hole in the end of the main stem should be visible 9 Replace the spring and button and tighten the screw while hold ing the button in place 10 Make sure the screw Item 48 is free of burrs that may cut the outer diaphragm Reposition the center label piece that you have saved during disassembly over the screw head 11 Replace the disc washer and lower guide insuring that the seat disc is clean and in position Lubricate the upper guide o ring Item 31a using an FDA approved lubricant to ease installation DO NOT USE LUBRICANT ON ANY OTHER PART 12 Position the relief valve module back into the body using your finger to help guide the lower guide into the relief valve seat ring bushing Push the module straight in DO NOT TWIST 13 Replace the outer diaphragm placing the fabric side agai
35. auge at the moment the first discharge is noted from the relief valve The differential pres sure at the time the relief valve opens must be no lower than 2 psi A O1 e Close the bypass needle valve FEBCO Model 825Y 24 2 Reduced Pressure Assembly Figure No 7 i Bypass Valve 2 Differential Pressure Gauge Bypass Needle Valve 1 ee Test Cock 2 Test Cock 3 Test Cock 1 11 H 1 M CE IU D e wn Inlet Shutoff Check Check Valve 2 Outlet Shutoff Value Value Valve 1 Test Check Valve 1 The check valve must be at least 3 psi more than the relief valve opening pressure 1 Open test cock 4 to flow a small amount of water through the unit to restore normal pressures 2 Observe the differential gauge with bypass valve 1 closed and test cock 2 and 3 open The gauge should remain at a reading of at least 3 PSI above the relief valve If it drops below this the check valve is leaking and must be serviced Test Check Valve 2 The check valve must be tight against reverse flow under all pres sure differentials 1 Connect the high side of the differential pressure gauge to test cock 4 2rd hose 2 Open test cock 4 With bypass needle valve 1 closed and bypass valve 2 open observe gauge reading T
36. e seat discs are symmetrical It is usually possible to turn the disc over and obtain an effective seal c If the seat disc has been severely cut along the seat ring diameter the assembly is being subjected to extremely high back pressure from thermal water expansion water hammer or other causes of excessive water pressure Seat discs damaged in such a manner should be replaced and not turned over to be reused 3 Check Valve Reassembly Model 825Y 3 4 2 See Figure No 11 a Position the disc in the cleaned holder and retain with disc washer and screw CAUTION DO NOT OVERTIGHTEN SCREW SECURE WITH APPROXIMATELY 12 INCH LBS b Position the spring around the centering ring of the disc holder and reinsert the disc holder assembly into the check body NOTE Ensure the heavy check spring is installed in the No 1 check valve or the valve will not operate properly and a con tinuous discharge may occur c Apply a thin coating of FDA approved lubricant on the o ring in the cap and thread cap onto the check valve body using the appropriate sized wrench MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedure 825Y and YA 84 2 Continued d Close the 4 3 and 2 test cocks and slowly open first the inlet and then outlet shutoff valves and return the assembly to service See Figure No 7 for test cock loca tions e Test the assembly to ensure it is operating properly 4 Relief
37. enter button e Place the disc washer and seat disc in position and retain with machine screw Depress the diaphragm button to ensure it is free moving f Place the relief valve module into the relief valve body and mount the diaphragm Be careful to position the diaphragm over the port bushing Replace the relief valve cover and tighten the capscrews g After completing reassembly by slowly open the inlet shut off valve Then bleed air from each chamber and from the relief valve cover by opening test cocks 4 3 and 2 See Figure No 7 for test cock locations Slowly open outlet shut off valve and return the valve to service h Test the assembly to ensure it is operating properly MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Model 825Y and YA 3 4 2 Parts Model 825Y amp YA Part Numbers Sizes 34 2 ITEM SIZE SIZE SIZE SIZE SIZE NO DESCRIPTION 1 14 14 2 3 Bushing 3 500 290 500 290 500 290 500 290 500 290 4 O ring 2 398 202 72 398 202 72 398 202 72 398 202 72 398 202 72 5 Gasket 2 340 078 340 078 340 078 340 079 340 079 6 Capscrew 2 515 513 05 515 513 05 515 513 05 515 514 06 515 514 06 7 Cap 2 101 134 101 134 101 134 101 135 101 135 8 O ring 2 398 226 72 398 226 72 398 226 72 398 235 72 398 235 72 9 Disc Holder 2 500 270 500 270 500 270 500 278 500 278 10 Seat D
38. he differential pressure should not drop to the relief valve opening point Restore Operation 1 Restore all valves and test cocks to their original positions Open and close resilient seated shut offs slowly to prevent damage to the system and assembly FEBCO Model 825YD 2 2 10 Reduced Pressure Assembly Figure No 8 Inlet Outlet Shutoff alla Shutoff Value Check Valve 1 Check Valve 2 i Value NS DN E X Test Cock Test Cock 4 Test Test oak Cock 1 2 A 3 Bypass Differential Pressure Needle Gauge Valve 1 Bypass Valve 2 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Field Testing Procedures Continued Test for the 826YD This device is tested with the same procedure as the Model 825YD However the bypass 825Y 3 4 valve must be isolated from the mainline valve using the 3 4 ball valves during the test and tested separately Proper Bypass Operations Flow 3 GPM through the bypass by opening the mainline test cock 4 Use the flow meter for this measurement 1 gallon flow a 20 second time period After the flow rate has been set col lect the discharge flow in a container for 20 seconds The volume of water collected should be one gallon FEBCO Model 826YD 215 10 Reduced Pressure Assembl
39. he relief valve consists of a hydrauli cally balanced diaphragm with the high pressure side hydraulically connected to the upstream side of the first check The low pres sure side is hydraulically connected to the reduced pressure zone thus the relief valve remains closed during normal operation The low pressure side of the diaphragm is spring loaded to force the relief valve open when the pressure drop across the first check and across the diaphragm reduces to approximately 2 5 psid A com plete assembly includes two shut off valves and four test cocks Example sectional views below show typical components and flow passages with corresponding pressure readings no flow conditions at the various locations within the assembly Model 825YD 21 10 Figure No 2 Inlet Shutoff Relief Valve Relief Valve Rotated 90 for Clarity Outlet Shutoff 1 gt First po gt VANS S 93 PSI Relief Valve Rotated 90 for Clarity Relief Valve MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Installation Guidelines Proper installation of the assembly is essential to the protection of the water supply N B O1 The assembly should be installed in a horizontal position with a minimum clearance of 12 between the relief valve discharge port and floor or grade
40. is removed with the relief valve the seat ring must be un threaded from the relief valve diaphragm plate being careful not to damage the seat ring threads and seating surface Remove cover bolts and nuts diaphragm cover and spacer from the relief valve assembly B j urn the relief valve upside down un thread screw Item 35 using 9 1 hex socket and remove diaphragm assembly spring button and spring 5 Un thread screw Item 48 and remove diaphragm washer and diaphragm from diaphragm button 6 Push main stem out of bottom of relief valve body 7 Remove o ring from body 2a Relief Valve Reassembly Non Modular Type Relief Valve Model 825 and 825D See Figure No 17 ES Assemble washer outer diaphragm spacer diaphragm button inner diaphragm and washer by securing with capscrews to form diaphragm assembly When installing diaphragms make sure side of diaphragm marked button side fabric side is toward diaphragm button and that diaphragm is not pinched ubricate main stem o ring with FDA approved lubricant Place seat disc on main stem and place disc washer on seat disc 3 Slide main stem bolt through main stem assembly and place inside relief valve body cavity with main stem bolt protruding gt Position spring over bolt and fit diaphragm assembly over spring Compress diaphragm assembly into spring until main stem bolt threads into diaphragm assembly Secure using a torque
41. isc e Inspect and replace as required f Worn guide bushings or stem f Inspect and replace as required g Guide not properly seated in cover 825 825D amp g Inspect and reassemble 825YD only Note If check valve seat disc has been severely cut at the seat ring diameter the assembly is being subject to extremely high and repeated back pressure Either thermal water expansion or water hammer are the most likely causes MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Field Testing Procedures Purpose of Test To test the operation of the DIFFERENTIAL PRESSURE RELIEF VALVE and CHECK VALVE Equipment Required for Test Differential Pressure Gauge test kit Equal to the RPTK1 shown on page 13 Test Differential Relief Valve The Differential relief valve must operate to keep the zone between the two check valves at least 2 psi less than the supply pressure i Slowly close the outlet shut off on the discharge side of the backflow preventer N Open air bleeds and test cocks until all air from the check valves is released Co Connect the high side of the differential pressure gauge to test cock 2 and the low side to test cock 3 Open test cock 2 and test cock 3 and bleed all air from the hose and gauge Slowly open the bypass valve needle 1 until the differential gauge needle starts to drop Hold the bypass in this position and observe the reading on the g
42. isc 2 400 099 400 099 400 099 400 103 400 103 11 Washer 2 300 084 300 084 300 084 300 108 300 108 12 Screw 2 516 543 03 516 543 03 516 543 03 516 543 03 516 543 03 13 Spring Inlet 1 630 125 630 125 630 125 630 137 630 137 14 Spring Outlet 1 630 115 630 115 630 115 630 118 630 118 15 Bolt 4 511 514 06 511 514 06 511 514 06 e 15 Bolt 8 o 00000 511 515 07 511 515 07 16 Cover 1 101 029 101 029 101 046 101 035 101 035 17 Diaphragm 1 400 101 400 101 400 101 400 104 400 104 18 Screw 1 700 107 700 107 700 107 519 513 03 519 513 03 19 Button 1 500 284 500 284 500 284 300 107 300 107 20 Spring 1 630 126 630 126 630 126 630 138 630 138 21 Mainstem 1 500 273 500 273 500 273 500 280 500 280 22 O ring 1 398 113 72 398 113 72 398 113 72 398 120 72 398 120 72 23 Guide 1 500 277 500 277 500 277 500 281 500 281 24 O ring 1 398 022 72 398 022 72 398 022 72 398 127 72 398 127 72 25 Seat Disc 1 400 102 400 102 400 102 400 105 400 105 26 Washer 1 300 104 300 104 300 104 300 105 300 105 27 Screw 1 700 137 700 137 700 137 519 513 03 519 513 03 101 Seat Ring Relief Valve 1 200 779 200 779 200 780 200 780 102 O ring Relief Valve 1 398 019 72 398 019 72 398 026 72 398 026 72 103 Elbow YA only 2 101 194 101 195 101 189 101 190 104 O ring YA only 2 398 223 72 398 223 72 398 230 72 398 230 72 Quantity required per valve Shutoffs Model 825Y amp YA ITEM SIZE SIZE SIZE SIZE SIZE NO DESCRIPTION QTY 1 114 D 2
43. ns causing inaccurate gauge c Eliminate pressure variations reading d Disc holder not perpendicular to stem d Inspect and reassemble if required NOTE Spring therefore disc not parallel to seat ring must be removed when tightening disc holder to 825 825D and 825YD stem e Damaged seat or seat disc e Inspect and replace as required f Worn guide bushings or stem f Inspect and replace as required g Guide not properly seated in cover 825 825D and g Inspect and reassemble IF RR NE 6 Discharge from drain hole in relief valve spacer a Leakage under diaphragm retaining screw 8 a Apply thin layer of sealant around each thread b Leakage under diaphragm at main stem diameter b Apply thin layer of sealant on button at the main stem diameter DO NOT EXCEED 15 INCH POUNDS when tightening center bolt c Hole in diaphragm c Replace diaphragm with fabric side towards the button 7 Second check fails to hold back pressure during a Outlet gate valve not closed completely a Check for debris blocking gate field testing b Debris fouling second check seat b Inspect and clean c Disc holder stem not moving freely in guide s c Inspect for dirt or other foreign material d Disc holder not perpendicular to stem d Inspect and reassemble if required NOTE SPRING therefore disc not parallel to seat ring MUST BE REMOVED WHEN TIGHTENING DISC 825 825D amp 825YD HOLDERTO STEM e Damaged seat or seat d
44. nst the button Work the rolled edge into the space between the mod ule and the body makings sure it is not pinched or buckled 14 Replace the cover tighten the cover bolts and reconnect the sensing tubing Return the valve to service and test to ensure proper operation 29 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Spring Removal Tool Figure No 20 Dimensions Inches 1 2 Steel Valve C DIA 2 PL S Plate 2 B C D E Min Size 4 91 4h 5 2 13 5 8 Y 6 1212 5 5 s 55 11 51 1 1 E 8 14 1 4 6 3 s 7 3 10 7 ii T 10 16 1 71 7 3 4 10 7 NOTE This information is provided to expedite servicing of FEBCO B i B products One tool may be fabricated for use on all required sizes A ral by drilling all holes at appropriate dimensions in a single steel plate of maximum required length See pages 18 amp 19 for instructions on D Threaded Rod use To order FEBCO spring removal tool order part number 905 121 CAUTION To avoid possible injury during use do not fabricate tool n from lesser strength material or to smaller dimensions than the minimums shown Seat Ring Tool Figure No 21 E DIA Th For Model 825 Only 1 i Dimensions Inches D i aNG A B
45. obtain an effective seal c If the seat disc has been severely cut along the seat disc ring diameter the assembly is being subjected to extremely high back pressure from thermal water expansion water hammer or other causes of excessive water pressure A disc damaged in such a manner should be replaced and not turned over to be reused 16 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedures 825 825D 825YD and 826YD 2 2 3 Continued 3b Valve Seat Removal Sizes 212 3 Bolted in 5 Check Valve Reassembly Sizes 212 3 Seat Ring Type Models 825D amp 825YD See Figure No 14 See Figures No 15 amp 16 1 Remove the three capscrews and washers retaining the seat ring 2 Pull the seat ring from the valve body being careful not to damage the internal epoxy coating of valve 3 If necessary un thread the bushing Item 2A from the seat ring 4 Remove the o ring 4a Valve Seat Reassembly Sizes 27 3 Threaded in Seat Ring Type Models Model 825 See Figure No 13 1 Lubricate o ring with FDA approved lubricant and replace on seat ring 2 Reinsert bushing into seat ring center 3 Thread seat ring into valve body in clockwise direction being careful not to damage the internal epoxy coating of valve 4b Valve Seat Reassembly Sizes 212 3 Bolted in Seat Ring Type Models Model 825D amp 825YD See Figure No 14 1 Lubricate o ring with FDA
46. off valve to allow sufficient flow of water through the assembly to clear all sand debris etc from the line If debris in the water continues to cause fouling a strainer may be installed upstream of the assembly Rinse all parts with clean water before reassembly Do not use any petroleum based oil grease solvent or pipe dope on any parts unless instructed to do so Use only water resistant lubricants that comply with FDA requirements for use in potable water systems Carefully inspect diaphragms seals and seating surfaces for damage or debris If the check valve seat disc has been severely cut at the seat ring diameter the assembly has been subjected to extremely high and repeated back pressure Either thermal water expansion or water hammer are the most likely causes If back pressure persists consider installation of a pressure relief valve downstream of the assembly Use caution to avoid damaging any guiding surfaces while han dling parts Do not force parts together The o ring seals used in FEBCO assemblies require only a small tightening force to ensure a positive seal Test unit after servicing to ensure proper operation 8 Refer to applicable parts list and figures for visual aid informa tion Figure No 6 Suggested Tool Kits Model 825Y 3 4 2 1 Crescent wrench 10 1 Medium Phillips screwdriver 1 Medium straight blade screw driver Allen head wrench 3 16 amp 1 4 size
47. owly during initial filing of system lines No 1 check valve would be 7 PSID or more at all b Debris fouling the relief valve seat b Inspect and clean times c Debris fouling the relief valve seat passage c Inspect and clean d Dirt or scaling jamming main stem or spring d Inspect and clean or replace button e Leakage at main stem or o ring diaphram e Inspect and clean or replace o ring and or main stem f Jammed main stem due to excessive torque on f Do not exceed 15 inch pound torque on main stem center bolt 825 and 825D center bolt MAINTENANCE MANUAL MODELS 82 825 825D 825YD amp 826YD Troubleshooting Guide Continued 4 Relief valve does not open above 2 0 psid during a Outlet gate valve not closed completely a Check for debris blocking gate field testing b Plugged low pressure hydraulic passage b Inspect and clean from ZONE to inner diaphragm c Improper alignment of internal parts during c Disassemble and center the button spring and reassembly causing high resistance to main stem movement d Jammed main stem due to excessive torque on d Do not exceed 15 inch pound torque on main stem center bolt 825 and 825D only center bolt 5 First check pressure drop is low a Debris fouling first check seat a Inspect and clean less than 5 psid during field testing b Debris fouling second check seat with b Inspect and clean backpressure c Inlet pressure variatio
48. rts Assemblies Kits Model 825D SIZE SIZE SIZE SIZE SIZE SIZE DESCRIPTION 24 3 4 6 8 10 Spring Assembly 1 Check 3 4A 5 6 7 7A 7B 10 11 15 51 905 085 905 087 902 466 902 468 902 470 902 472 Spring Assembly 2 Check 3 4A 5 6 7 7A 7B 9 10 11 15 51 905 086 905 088 902 467 905 469 902 471 905 473 Rubber Parts Cl amp DI Bodies 11 14 51 905 059 905 060 905 061 905 062 905 063 905 064 Relief Valve Kit Type D Only 902 440 902 440 902 440 902 446 902 446 902 446 Relief Valve Kit 26 27 32 39 49 2 Rubber Parts 905 066 905 066 905 066 905 067 905 067 905 067 LG Mounting Kit 16 17 17A 17B 40 41 Both Ends Assemblies Kits Model 825YD 905 036 905 037 905 038 905 039 905 040 905 041 SIZE SIZE SIZE SIZE SIZE SIZE DESCRIPTION 3 4 6 8 10 Spring Assembly 1 Check 3 4A 5 6 7 7A 7B 10 11 15 51 Spring Assembly 2 Check 3 4A 5 6 7 7A 7B 9 10 11 15 51 905 085 905 087 902 466 902 468 902 470 902 472 905 086 905 088 902 467 905 469 902 471 905 473 Seat Ring Kit 2 2A 2C 2D 12 902 386YD 902 385YD 902 384YD 902 383YD 902 382YD 902 381YD Rubber Parts Cl amp DI Boddies 11 14 51 905 059 905 060 905 061 905 062 905 063 905 064 Large Mounting KIEG 4 905 036 905 037 905 038 905 039 905 040 905 041 Both Ends Relief Valve Assy Type YD Only 21 50 905 100 905 10
49. s and 1 4 Allen head wrench for 17 2 and 2 assemblies b Pull the relief valve body from the main valve body Pull the discharge shield from the seat ring c Remove seat ring with the appropriate sized socket or needle nose pliers Use care to avoid damage to the seat edge Replaceable relief valve seat is standard only on units manufactured after October of 1988 d Inspect seat ring o rings bushings and gasket seals for damage Rinse all parts with clean water before reassembly MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedure 825Y and YA 4 2 Cont 6 Relief Valve Reassembly Model 825Y 3 4 2 See Figure No 11 a Lubricate the seat ring o ring with FDA approved lubricant and thread seat ring into the valve body until seated Do not over tighten Replaceable relief valve seat ring standard on units manufactured after October of 1988 b Position the discharge shield over the seat ring diameter and taking care not to damage the two flow passages rein Stall o rings and guide bushings c Carefully place the relief valve body over the bushing and tighten the two capscrews to retain the relief valve body to the main valve body New capscrew sealing washers should be installed to avoid leakage d Lubricate the o rings and main stem using FDA approved lubricant Place the main stem and spring into the guide and replace the flat head screw located at the c
50. sure and or water hammer Most field problems occur because dirt or debris present in the system at the time of installation becomes trapped in the first check seating area resulting in continuous discharge from the relief valve in a static or backflow condition THE SYSTEM SHOULD BE FLUSHED BEFORE THE ASSEMBLY IS INSTALLED However to effectively flush the system after the assembly has been installed remove the internal compo nents of both checks and open the inlet shut off to allow water to flow for a sufficient time to flush debris from the line and assembly If debris In the water system continues to cause fouling a strainer can be installed upstream of the assembly Typical Installations Cy Wye Strainer il Figure No 3 o Flow a M Maintain Support ax approved 12 Min air gap Air Gap and distance Drain Larger Indoor Installation Figure No 4 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Freeze Protection Procedure The reduced pressure backflow prevention assembly is subject to damage if the internal water is allowed to freeze It is suggested that all assemblies be installed with resilient seated shutoffs so
51. t one half of the relief valve will be drained To drain the relief valve on Models 825 and 825D loosen the relief valve cover bolts and allow the relief valve to drain Retighten bolts before repressurizing system To drain relief valve on Models 825YD open the two air bleeds one on the body the other on the cover then remove drain plugs Replace drain plugs before repressurizing system Co The system design must provide a means for draining upstream of the 1 check valve and downstream of the 2 check valve Test cocks 1 2 and 4 and the air bleed valve on 2 check valve may be opened to allow air to enter to assist in draining Depending on system design these sec tions should be able to be drained to the pipe centerline Position the assembly shutoff valves and test cocks in the half open half closed position to allow complete draining of the assembly shutoff valve bodies and test cocks A O1 Some units contain a drain plug in the bottom of the second check body Open test cocks and remove plug to drain MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Vandalism Protection Procedure 1 If the unit is installed where vandalism may be a problem the 2 A protective cage can be installed over the unit to discourage assembly should be protected and secured On 3 4 2 units vandals If a cage is used it should be installed so that ade the handles of shutoff valves can be removed to discourage q
52. the sensing tubing Return to service and test the assembly to ensure proper operation 5a Relief Valve Inner Diaphragm Replacement Modular Type Relief Valve Model 825YD See Figure No 18 i Disconnect the sensing tubing Remove the cover Item 21 by loosening and removing cover bolts Item 25 N ton Item 24 with one hand Insert your fingers into the rectan gular relief valve port on the bottom of the relief valve and apply force to the seat disc Pull the relief valve module straight out DO NOT TWIST Remove the lower guide item 35 and disc washer item 33 Co Place the relief valve module upside down on a clean flat surface Remove the center label piece protecting the screw head and save this piece for reassembly With one hand apply force suf ficient to hold the button against the main stem Keep the spring Item 28 compressed spring is approximately 35 lbs while unscrewing the pan head screw item 48 Remove the screw and relieve the spring tension Remove the button and spring B Remove the main stem and un thread the retainer Item 34 from Remove the outer diaphragm Item 26 Grasp the relief valve but the upper guide Item 32 Remove the slip ring Item 27a and inner diaphragm item 27 Inspect clean and replace parts as required To reassemble position the bead on the inner diaphragm into the groove of the upper guide Place the slip ring over the diaphragm Lubric
53. uate clearance is available for maintenance and testing or it tampering On 2 2 10 units a chain can be looped between should be completely removable Also allow for any discharge shutoffs and locked in position to prevent tampering with from the relief valve to fully drain from the protective cage shutoff valves Test cock handles can also be removed On backflow prevention assemblies installed in conjunction with fire sprinkler systems an alarm can be placed on the OS amp Y shut off valves that will sound if unauthorized closure should occur 3 Some units include screw driver adjusted test cocks for vandal resistance MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD General Service Procedures General Service Instructions applicable to all models and sizes eme FEBCO backflow prevention assemblies can be serviced with commonly available tools and are designed for ease of mainte nance The assemblies are designed to be serviced in line so the unit should not need to be removed from the line during servicing The most common cause of check fouling and relief valve dis charge is dirt and debris in the seating areas The line should Am f be flushed clean of debris before installation of the assembly To flush the line after installation of the assembly slowly close the inlet shutoff valve remove the covers and internal assem blies of both check valves and open the inlet shut
54. wrench DO NOT TIGHTEN MAIN STEM BOLT BEYOND 15 INCH LBS OR DISTORTION OF THE MAIN STEM ITEM 30 WILL OCCUR Thread seat ring into main valve body and thread relief valve into seat ring 28 O1 6 Reconnect copper tubing to relief valve 7 Slowly open inlet shut off valve and bleed air by opening first test cock 4 then test cocks 3 and 2 and all air bleeds 8 Slowly open outlet shut off valve and return the valve to service 9 Test the assembly to ensure it is operating properly 3a Relief Valve Seat Disc Replacement Modular Type Relief Valve Model 825YD See Figure No 18 1 Disconnect sensing tubing Remove relief valve cover Item 21 by loosening cover bolts Item 25 and remove the outer dia phragm Item 26 2 Grasp the relief valve button Item 24 with one hand Insert fingers into the rectangular relief valve port on the bottom of the relief valve and apply force to the seat disc Pull the relief valve module straight out from the body DO NOT TWIST 3 Place the relief valve module on a flat surface Holding the main stem with one hand loosen and remove the lower guide Item 35 and disc washer Item 33 Remove the rubber seat disc Item 32 and turn over or replace as required Inspect all parts and clean using clean water Refer to section 5a on replacing relief valve diaphragms if this procedure is necessary 4 Replace the disc washer and lower guide and tighten Lubricate the o ring Item 31
55. y Figure No 9 SS 4 e e i 4 Od p p 10 Restore Operation After testing restore all valves to their original positions Note This is a suggested typical test method Check with your local code for approved test procedures in your area Testing with the FEBCO Test Kit The FEBCO Test Kit includes gauge complete with hoses fit tings adapters and laminated instructions in a compact plastic case The FEBCO Test Kit includes a differential pressure gauge used to test all approved Reduced Pressure Assemblies including the FEBCO Models 825Y 825YA 825YD Reduced Pressure Assemblies and the 826YD Reduced Pressure Detector Check Figure No 10 BLUE RED BLUE YELLOW e 5 MAINTENANCE MANUAL MODELS 825Y 825YA 825 825D 825YD amp 826YD Service Procedure 825Y and YA 2 4 2 1 Check Valve Inspection Repair Model 825Y 34 2
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