Zurn-Wilkins 2-350XL Installation Guide
Contents
1. 13 20 23 35 32 48 52 78 iver 32 48 63 22 5 amp 2 78 1 167 SPECIFICATIONS Maximum working water pressure 175 PSI Maximum working water temperature 180 F Hydrostatic test pressure 350 PSI End connections Threaded ANSI B1 20 1 Proper performance is dependent upon licensed qualified personnel performing regular periodic testing according to ZURN WILKINS specifications and prevailing governmental amp industry standards and codes and upon following these installation instructions Failure to do so releases ZURN WILKINS of any liability that it might otherwise have with respect to that device Such failure could also result in an improperly functioning device ZURN WILKINS 1747 Commerce Way ZURN WILKINS Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 4 IS350 114 2 REV 4 13 www zurn com2. Close high side bleed needle valve If a tube is attached to test cock 4 open test cock 4 to fill the tube Close test cock 4 Close 1 shut off valve 3 Hold gauge at same level as test cock 4 or water level in tube Slowly open test cock 4 Record the static pressure drop across check valve 2 after gauge reading stabilizes and water stops running out of test cock 4 4 Close all test cocks slowly open shut off valve 1 amp 2 and remove test equipment 2 TEST COCK 3 TEST COCK 4 TEST COCK 2 SHUT OFF VALVE LOW SIDE BLEED NEEDLE VALVE LOW SIDE HOSE ZURN WILKINS www zurn com Maintenance Instructions All Model 350 Double Check Valve Backflow Preventers must be inspected and maintained by licensed personnel at least once a year or more frequently as specified by local codes Replacement of worn or damaged parts must only be made with genuine ZURN WILKINS parts i O RING GENERAL MAINTENANCE SEAT 2 SEAL Ay 1 Clean all parts thoroughly with water after disassembly Gane 2 Carefully inspect rubber seal rings and o rings for damage G 3 Test unit after reassembly for proper operation refer 1 by to TESTING PROCEDURES SPRING SPRING RETAINER 2 SEAT 1 AM SERVICING CHECK VALVES SPRING SPRING 1 Close inlet and outlet shut off valves Ba Bs ao Open No 2 No 3 and No 4 test cocks to release pressure from valve 3 Unscrew the 4 bolts 1 4 20 UNC
3. Hex Flange hold ing the housing in place Lift housing up to remove 4 Twist and remove sleeve from body Using finger or blunt object push in outlet end of body both checks should slide out the body inlet A short object like a CHECK ASSEMBLY socket can be placed on a flat surface Place body over object so it pushes into valve outlet and push down on body 5 Twist spring retainers counter clockwise to remove from seats and access poppets 6 Inspect the rubber seal ring for cuts or embedded de bris To remove seal ring remove screw and seal ring retainer If the reverse side of the seal ring is unused it is possible to invert the seal ring This will be consi dered a temporary solution to fixing a fouled check TEST CORKS and should be replaced with a new seal ring as soon g K B as possible i F 7 Inspect seat surface for nicks or dings and replace if T pour necessary Use fingernail to check for dings Re grease seat o rings 8 Inspect seat o ring sealing areas in body and wipe SLEEVE clean 9 Reverse the above procedures to reinstall check valve assembly Drop 2 check assembly in body Then drop 1 check assembly in and turn until 1 spring retainer lines up with 2 seat Then push both assemblies into body Insert sleeve against checks Place sleeve down against flat surface and push on body with rocking motion 10 Lightly grease face of o rings on housing and reinstall into body following the above proce
4. Slowly open all 4 test cocks to remove any foreign material and attach fittings 2 Attach hose from the high side of the test kit to the 2 test cock 3 Open test cock 2 and bleed all air from the hose and gauge by opening the high side bleed needle valve Close high side bleed needle valve If a tube is attached to test cock 3 open test cock 3 to fill the tube Close test cock 3 Close 2 shut off valve then close the 1 shut off valve 4 Hold gauge at same level as test cock 3 or water level in tube Slowly open test cock 3 Record the static pressure drop across check valve 1 after gauge reading stabilizes and water stops running out of test cock 3 5 Close all test cocks open shut off valve 1 and remove test equipment 1 TEST COCK 1 SHUT OFF VALVE HIGH SIDE BLEED NEEDLE VALVE HIGH SIDE HOSE VENT HOSE 2 ZURN WILKINS 1747 Commerce Way Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 TEST NO 2 TIGHTNESS OF 2 CHECK VALVE REQUIREMENT The static pressure drop across check valve 2 shall be at least 1 0 psid If test cock 4 is not at the highest point of the check valve body then a vertical tube must be installed on test cock 4 so that it rises to the top of the check valve body PROCEDURE 1 Attach hose from the high side of the test kit to the 3 test cock 2 Open test cock 3 and bleed all air from the hose and gauge by opening the high side bleed needle valve
5. Model 350 Double Check Valve Assembly 1 1 4 2 ZURN WILKINS Installation U Testing Q Maintenance Instructions INSTALLATION INSTRUCTIONS CAUTION Installation of Backflow Preventers must be performed by qualified licensed personnel The installer should be sure the proper device has been selected for the par ticular installation Faulty installation could result in an improperly functioning device ZURN WILKINS Model 350 Double Check Valve assemblies are for use on water lines where a health hazard does not exist in the event of a backflow situation Damage to the device could result wherever water hammer and or water thermal expan sion could create excessive line pressure Where this could occur shock arresters check valves and or pressure relief valves should be installed downstream of the device If installation is in a pit or vault the Backflow Preventer must never be submerged in water because this could cause a cross connection Make sure that the pit or vault always remains dry by providing ample drainage 1 Before installing a Model 350 Backflow Preventer flush the line thoroughly to remove all debris chips and other foreign matter If required a strainer should be placed upstream ofthe Backflow Preventer CAUTION Do not use a strainer in seldom used emergency waterlines such as fire lines 2 Provide adequate space around the installed unit so that the test cocks will be accessible for te
6. dures in revers order Rock body side to side to help o rings slide in If it does not drop in completely do not use screws to force it An overly greased o ring might slide out of groove at top of ball valve Use a screw driver to push o ring back in groove then push body down in lt O RING N o HOUSING O RING Note When installing housing match slight taper on the outlet of the housing with corresponding taper in body AE e ZURN ZURN WILKINS 3 WILKINS 1747 Commerce Way Paso Robles CA 93446 Phone 855 663 9876 Fax 805 238 5766 www zurn com Troubleshooting PROBLEM POSSIBLE CAUSES CORRECTIVE ACTION 1 LEAKING CHECK VALVES 1 Debris on seat or seal ring 1 Clean seat and seal ring area 2 Damaged seat 2 Replace seat 3 Damaged seal ring 3 Replace poppet 4 Damaged check o ring 4 Replace check o ring 2 LOW OR NO FLOW 1 Device installed backwards Shut off valves or valve upstream may not be fully open 3 Low supply pressure Performance Characteristics Flow Characteristics MODEL 350 1 1 4 1 1 2 amp 2 STANDARD amp METRIC FLOW RATES l s 0 0 3 2 6 3 9 5 12 6 15 8 15 103 e e 9 ee a o 3 ao EE 1 1 4 32mm TAIAO s99 u o 4 7 40mm ie 2 o 5 8 no 2 N lio g 5 34 u a a 0 0 0 50 100 150 200 250 FLOW RATES GPM Rated Flow Established by approval agencies 5 7 9 6 12 17 m of 13 20 23 35 5 7 12
7. ndoor installation is preferred in areas that are subject to freezing conditions All the basic installation instructions apply to such installations DIRECTION OF FLOW lt gt OUTDOOR INSTALLATION The Model 350 Backflow Preventer may be installed outdoors only if the device is protected against freezing conditions Exposure to freezing conditions will result in improper function or damage to the device The installation location must be kept above 32 F All the basic installation instructions apply Proposition 65 Warning This product contains chemicals known to the State of California to cause cancer or birth defects or other reproductive harm In accordance with U S Federal Safe Drinking Water Act Lead Free requirements as of January 4 2014 this product can only be used in water systems considered non potable Please contact your local water utility for further requirements Testing Procedures MODEL 350 DOUBLE CHECK VALVE ASSEMBLY Equipment Required Differential pressure gauge test kit TEST NO 1 TIGHTNESS OF 1 CHECK VALVE REQUIREMENT The static pressure drop across check valve 1 shall be at least 1 0 psid If test cock 3 is not at the highest point of the check valve body then a vertical tube must be installed on test cock 3 so that it rises to the top of the check valve body PROCEDURE 1
8. sting and servicing 3 Install valve at least 12 inches above surrounding flood level 4 Always consult local codes for installation methods approvals and guidance l DIRECTION OF FLOW gt gt l VERTICAL INSTALLATION Vertical installation is acceptable in applica tions where inlet and outlet piping are flow ing vertically upwards All the basic installa tion instructions apply to such installations Consult factory for approval status PLACING THE MODEL 350 IN SERVICE 1 Start with both shut off valves closed Slowly open the inlet shut off valve until the backflow preventer is completely pressur ized 2 When the unit has been pressurized vent any trapped air by slightly opening each of the four test cocks 3 Slowly open the downstream shut off valve The Model 350 Double Check Valve assembly is now in service 4 After the Model 350 has been prop erly installed test the device see TEST PROCEDURES If the device fails the test remove the first and second check valves and thoroughly flush the device Clean rubber and seats of all debris and place unit back in service DIRECTION OF FLOW Sy OPTIONAL STRAINER MODEL SXL PROTECTIVE E ENCLOSURE DIRECTION OF FLOW gt gt I INDOOR INSTALLATION I
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