Emerson LR128 Data Sheet
Contents
1. 2 Values published in this table are laboratory tested and are presented based on offset positive control deviation only pressure build up above setpoint 13 Bulletin 71 4 LR128 TYPE MR98H PILOT OPTIONAL INDICATOR COVER TRAVEL INDICATOR T COVER REMOVAL 1 4 112 1 8 CONTROL RESTRICTOR LINE CONNECTION 1 2 NPT PILOT D4 VALVE TRIM EXHAUST CONNECTION 1 4 NPT PILOT V REMOVAL SUPPLY CONNECTION ERAA03112 A Figure 5 Type LR128 Dimensions Schematic Table 15 Type LR128 Dimensions DIMENSIONS In mm ____ _____ T V CL150 RF CL300 RF CL600 RF CL150RF CL300 RF CL600 RF SST 7 40 5 40 11 39 2 40 8 10 8 10 2 97 9 40 1 25 3 62 91 9 3 88 98 6 4 13 104 9 7 25 184 2 7 75 196 9 8 25 209 6 189 0 137 0 289 3 205 8 2058 238 8 9 00 6 89 11 651 3 10 8 18 9 18 2 00 11 00 2 50 5 0 127 0 5 3 133 4 5 6 143 0 10 00 254 0 10 50 266 7 11 25 286 0 2290 1750 2959 207 8 2332 279 4 13 30 9 33 13 68 3 80 8 66 9 66 3 80 15 00 3 80 5 9 149 3 6 3 158 8 6 6 168 3 11 75 298 5 12 50 317 5 13 25 336 6 338 0 2369 3475 220 0 2454 381 0 14 70 1 10 47 15 24 5 10 9 52 9 52 3 80 17 00 4 100 6 9 176 3 7 3 184 2 72. eo zs 0 o 2 5 o 5 NS 5 Q 5 o i uc o 55 n o2 5 N GN 257 GNE c QN X 29 Oo lt 70 to 140 psig 4 8 to 9 7 bar 1E395727192 N o gt e CN 2 a CN c uc 0 o c CN Q gt c e gt s o Q O O as e e 7 A I c gt Q gt 2 CN I e o 5 2 S c CN m Q gt 130 to 200 psig 9 0 to 13 8 bar 1L380027142 100 to 375 psig 11 LR128 Table 13 Capacity Water GPM L min for 1 and 2 in DN 25 and 50 Bodies at Offset Pressure Build Up Above Setpoint 2 Bulletin 71 4 BODY SIZE SET PRESSURE 2 In DN 50 1 In DN 25 umn opm o z amp o z 2 0 SPRING PART NUMBER AND SPRING COLOR lume 80 1min Lmin nin i foe mm om mm fe om nm re fm mm me mom ES me 35 to 75 psig 2 4 to 5 2 bar 1D7455T0012 Green 70 to 140 psig 4 8 to 9 7 bar 1E395727192 Red 130 to 200 psig 9 0 to 13 8 bar 1L3800
3. pressure is defined as the pressure at which the pilot starts to discharge 2 Crack point pressure of the main valve of the inlet pressure buildup over the set pressure at which the main valve starts audible flow 3 Inlet pressure buildup over the set pressure for the main valve to achieve wide open flow capacity Bulletin 1 4 L R128 Table 5 LR128 Valve Minimum Differential Pressure MAIN VALVE MINIMUM DIFFERENTIAL PERCENT OF CAPACITY DIAPHRAGM BODY SIZE For 90 Capacity For 100 Capacity _ Diaphragm Code Diaphragm Material bad 17268 standard Nitrile NBR Low Minimum Differential 17E97 Nitrile NBR High Erosion Resistance Fluorocarbon FKM adi High Temperature Capability Fluorocarbon FKM MESE High Temperature Capability 17268 standard Nitrile NBR Low Minimum Differential 17E97 Nitrile NBR High Erosion Resistance Fluorocarbon FKM S High Temperature Capability 17268 standard Nitrile NBR Low Minimum Differential 17E97 Nitrile NBR High Erosion Resistance 4 Fluorocarbon FKM m VER High Temperature Capability 1 See Table 1 for Type LR128 main valve structural design ratings and Table 2 for Type MR98H pilot rating 17E68 standard Nitrile NBR Low Minimum Differential 18 2 50 17 97 Nitrile NBR High Erosion Resistance Table 6 Type LR128 Maximum Pressure Ratings and Diaphragm Selection Information 1 MAXIMUM MAXIMUM MAXIMUM BOBVSIE
4. 6813 1874 7093 1945 362 N LA 13 8 1356 5132 1416 5360 1474 5579 1529 5787 2180 8251 8618 2370 8970 2460 9311 1042 3944 1081 4092 1542 5836 610 6094 1676 6344 1739 582 e cO e e 1888 1174 4444 1226 4640 1276 4830 1325 501 1972 7464 2053 7771 2130 062 13 8 1356 1416 5360 1474 5579 1529 5787 2180 8251 2277 8618 2370 8970 2460 9311 17 2 1516 1583 5992 1648 6238 1710 6472 2438 9228 2546 9637 2650 10 030 2750 10 409 20 7 1660 6283 1734 6563 1805 6832 1873 7089 2670 10 106 2 5738 24 1 1793 6787 1873 7089 1950 7381 2023 7657 2884 10 916 3013 11 404 3136 11 870 3254 12 316 25 9 18 7025 1939 2018 7638 2094 7926 2986 11 302 3118 11 802 3246 12 286 3368 12 748 1 Type LR128 on liquid service with 1 2 NPT Type MR98H Pilot 100 Cage Capacity with Strainer and Type 112 Restrictor Setting of 6 8 for the 3 in 80 body size and 8 for the 4 in DN 100 body size 100 to 375 psig 6 9 to 26 0 bar 14B9942X022 Unpainted N N N N N N cO e C1 C1 N cO O o cO C2 O 339 C2 N N N e e e e
5. Easy to Maintain Pilot The pilot is designed to allow quick and simple in line trim inspection and parts replacement Powder Paint Coating Carbon steel body is powder paint coated providing superior impact abrasion and corrosion resistance Bulletin 1 4 L R128 Table 1 Type LR128 Main Valve Body Sizes End Connection Styles Structural Design Ratings and Maximum Operating Relief Inlet Pressure MAXIMUM OPERATING MAIN VALVE MAIN VALVE STRUCTURAL DESIGN RELIEF INLET MAXIMUM OPERATING BODY SIZE BODY END CONNECTION STYLE 2 RATING 3 PRESSURE INCLUDING OUTLET PRESSURE MATERIAL BUILD UP 3 da or WCC Steel pm 50 80 NPT CF8M 190 0 Stainless steel CL300 RF Lm ma m CL600 RF 1440 1 The pressure temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded 2 Ratings and end connections for other than ASME standard can usually be provided Contact your local Sales Office for assistance 3 Maximum cold working pressure CWP per ASME B16 34 or product bulletin limit whichever is lowest Temperature may decrease these maximum pressure Table 2 Type MR98H Pilot Maximum Cold Working Pressure 1 2 BODY AND SPRING BODY SIZE mque MAXIMUM INLET PRESSURE MAXIMUM OUTLET PRESSURE 1 2 NPT Steel 450 psig 31 0 bar 450 psig 31 0 bar Stainless steel psig psig 1 The pressure temperature limits in this Bulletin and any applicable stand
6. branded regulators are laboratory tested One hundred percent of the published flow capacity can be used with confidence Thorough Laboratory Testing Emerson Process Management Regulator Technologies Inc Emerson M state of the art flow laboratory Bulletin 71 4 LR128 W7345 Figure 2 Type LR128 Features and Benefits continued allows thorough testing of all new designs Tests are conducted on Fisher branded regulators for performance features such as flow strength shutoff and material compatibility Easy In Line Maintenance Top entry design reduces maintenance time Trim parts can be inspected cleaned and replaced without removing the body from the pipeline No special alignment is required when replacing the diaphragm O Ring Design The LR128 uses elastomer O rings instead of gaskets reducing maintenance and assembly time In Service Travel Indicator The optional travel indicator responds to the precise movement of the diaphragm and plug assembly and shows the actual valve position The travel indicator makes in service inspection and troubleshooting easy Also it can be used for remote alarming and monitoring stem position Versatility The Type LR128 uses the making available the standard construction materials and end connections ASME and EN used by other E body regulators and control valves Type MR98H can handle set pressures up to 375 psig 25 9 bar
7. m OPERATING OPERATING EMERGENCY INLET DIFFERENTIAL AND DIFFERENTIAL MATERIAL PRESSURE PRESSURE PRESSURE STYLE om bar psia bard psia bard 17297 NBR High pressure 450 310 4502 3100 m 1 and or erosion resistance i 17288 Fluorocarbon High aromatic 450 310 4502 31 00 JEG hydrocarbon content resistance 17E68 Nitrile NBR Low temperature 17E97 Nitrile NBR High pressure 450 310 4502 3100 AEn ET 2 and or erosion resistance 17E88 Fluorocarbon FKM High aromatic 450 310 4502 31 00 hydrocarbon content resistance 17E68 Nitrile NBR Low temperature 17E97 Nitrile NBR High pressure 450 310 4500 31 00 m 3 and or erosion resistance i 17288 Fluorocarbon FKM High aromatic 450 310 4500 31 00 RED m hydrocarbon content resistance 17 68 NBR Low temperature 17297 High pressure 450 310 4502 31 02 es 4 and or erosion resistance 17E88 Fluorocarbon FKM High aromatic 450 310 4502 31 00 m hydrocarbon content resistance i 1 See Table 1 for main valve structural design ratings and Table 3 for pilot ratings 2 For differential pressure above 400 psid 27 6 bar d diaphragm temperatures are limited to 150 F 66 C 3 These are recommendations that provide the best regulator performance for a typical application Please contact your local Sales O
8. 27142 Blue 100 to 375 psig 6 9 to 26 0 bar 14B9942X022 Unpainted 1018 281 1054 292 1105 sos 1147 923 3494 964 3649 1003 3796 1041 3940 1098 1147 1196 1241 3774 1041 3940 1084 4103 1125 4258 1139 1188 1238 1283 1032 3906 1078 4080 1122 4247 1164 4406 N o gt o a e LO c CN 2 CN c gt uc gt E o c CN v q gt c gt os 09 gt o O O as e Nu 9 A I c gt gt A 2 N e o 5 2 S c CN c gt 3 o gt ka gt 3 Fa um 2 o o gt c gt c 2 2 E as c o Fa c o il o g E il Oo icy xD 59 2 5 2 e o 53 gt N 12 Bulletin 1 4 L R128 Table 13 Capacity Water L min for and 4 in DN 80 and 100 Bodies at Offset Pressure Build Up Above Setpoint 2 continued BODY SIZE SET PRESSURE SPRING RANGE SPRING P
9. 8 196 9 13 88 352 6 14 50 368 3 15 50 393 7 373 0 2659 3871 1300 2418 2418 431 8 14 Ordering Information Carefully review each specification on page 2 then complete the Ordering Guide on this page If a pilot setpoint is not requested the regulator will be factory Ordering Guide Body Size Select One 1 1 in DN 25 2 in DN 50 3in DN 80 4 in DN 100 Body Material and End Connection Style Select One WCC Steel Body 1 Available in 1 in and 2 in bodies only 1 SWE Available in 1 in and 2 in bodies only CL150 RF CL300 RF 600 RF 1 PN 16 25 40 CF8M Stainless Steel 1 NPT Available in 1 in and 2 in bodies only CL150 RF CL300 RF CL600 RF PN 16 25 40 Main Valve Diaphragm Material Select One 0 17268 Nitrile NBR low minimum differential standard L 17E97 Nitrile NBR high erosion resistance L 17E88 Fluorocarbon FKM high temperature capability specify specify Main Valve O ring Material Select One L Nitrile NBR standard L Fluorocarbon FKM 1 150 to 375 psig 10 3 to 25 9 bar spring range is for the Type MR98HH pilot construction Bulletin 1 4 L R128 set at the approximate midrange Please complete the opecification Worksheet on page 16 Travel Indicator Select One No standard O Yes Inlet Body Tap Select O
10. ART NUMBER AND SPRING COLOR 3 In DN 80 4 In DN 100 20 5 N 3 5 _ Co E 5 5 OT uH cO N N OT N O X N N O OT O N N N cO oO 1088 4118 1185 4485 c I O C2 N cO 1233 4667 1280 4845 1750 6624 4322 1188 4497 1233 4667 1610 6094 130 to 200 psig 150 10 3 1174 4444 1226 4640 1276 4830 1325 5015 1888 7146 1972 7464 2053 7771 2130 062 9 0 to 13 8 bar 1L380027142 1268 4799 1325 5015 1379 5220 1431 5416 2040 7721 2130 8062 2217 8391 2301 8709 c e 7210 1983 7506 2058 7790 1142 6949 1911 7233 1983 506 QD 35 to 75 psig UA dii 50 34 678 2566 708 2680 737 2790 765 2895 1090 4126 1139 4311 1185 4485 1230 656 1D7455T0012 Green 830 3142 867 3282 903 3418 937 3547 1335 5053 1395 5280 1452 5496 1506 700 802 3036 838 3172 872 3301 905 3425 1290 4883 1347 5098 1402 5307 1455 5507 70 to 140 psig 100 rm 959 3630 1001 3789 3944 1081 4092 1542 5836 6094 1676 6344 1739 582 4 8 to 9 7 bar 1E395727192 Red 125 907 3433 1119 4235 1165 4410 1209 4576 1459 5522 1800
11. Bulletin 71 4 LR128 November 2014 Type LR128 Relief Valve or Backpressure Liquid Regulator Rugged design Reliable Thoroughly tested nternally actuated Compact 1 2 3and4 in DN 25 50 80 and 100 body sizes Recommended for water and oil applications Full SST construction available for harsh environments API 614 Compliant Figure 1 Type LR128 Relief Valve or Backpressure Regulator Introduction The Type LR128 pilot operated pressure relief valve or backpressure regulator is designed for liquid industrial commercial applications The Type LR128 provides smooth operation tight shutoff and long life Its internally actuated metal plug eliminates disadvantages associated with flexible element style h FISHER EMERSON regulators and the specially engineered flow path deflects debris protecting the seat from damage and erosion The Type LR128 is used in conjunction with a Type MR98H pilot and Type 112 restrictor An internal inlet strainer prevents large particles from entering the main valve limiting damage to internal parts e Process Management D103577X012 Bulletin 1 4 LR126 Specifications Main Valve Body Sizes End Connection Styles and Structural Design Ratings 1 2 See Table 1 Maximum Inlet Pressure Type LR128 Main Valve See Table 1 Type MR98H Pilot See Table 2 Type 112 Restrictor 1500 psig 103 bar Maximum Outlet Pressure Type LR128 Main Va
12. Special Order Constructed from Non Stocked Parts Consult your local Sales Representative for Availability Other Requirements Availability of the product being ordered is determined by the component with the longest shipping time for the requested construction Industrial Regulators Natural Gas Technologies TESCOM Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75070 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Shanghai 201206 China Tel 86 21 2892 9000 Europe Bologna 40013 Italy Tel 39 051 419 0611 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 Emerson Process Management Regulator Technologies Inc USA Headquarters McKinney Texas 75070 USA Tel 1 800 558 5853 Outside U S 1 972 548 3574 Asia Pacific Singapore 128461 Singapore Tel 65 6770 8337 Europe Bologna 40013 Italy Tel 39 051 419 0611 Chartres 28008 France Tel 33 2 37 33 47 00 Middle East and Africa Dubai United Arab Emirates Tel 971 4811 8100 Emerson Process Management Tescom Corporation USA Headquarters EIk River Minnesota 55330 2445 USA Tels 1 763 241 3238 1 800 447 1250 Europe Selmsdorf 23923 Germany Tel 49 38823 31 287 Asia Pacific Shanghai 201206 China Tel 86 21 2892 9499 For further information visit www emersonprocess com regulators The Emerson logo is a trademark and service mark of Emerson Elec
13. arbon FKM Flanged Locknut 17 4 Stainless steel Backup Rings Polytetrafluoroethylene PTFE Upper Spring Seat 416 Stainless steel Indicator Protector and Cover Plastic Indicator Stem 303 Stainless steel Indicator Fitting 416 Stainless steel Travel Indicator Plug 416 Stainless steel Type MR98H Pilot Body WCC Steel or 316 Stainless steel Spring Case WCC Steel or 316 Stainless steel Orifice 416 Stainless steel Valve Plug 416 Stainless Steel Guide and Pusher Post 416 Stainless steel Gasket Nitrile NBR or Fluorocarbon FKM O rings Nitrile NBR or Fluorocarbon FKM Diaphragm Neoprene CR or Fluorocarbon FKM Mounting Parts Pilot Mounting Pipe Nipple Plated steel or Stainless steel Pipe Fittings Plated steel or Stainless steel Tubing Stainless steel Type 112 Restrictor Body 15 5 Stainless steel Groove Valve 416 Stainless steel Retainer 416 Stainless steel Pipe Plug 316 Stainless steel O rings Nitrile NBR or Fluorocarbon FKM 1 The pressure temperature limits in this Bulletin and any applicable standard or code limitation should not be exceeded 2 Ratings and end connections other than ASME standards can usually be provided contact your local Sales Office 3 Nominal sieve opening TYPE MR98H PILOT Bulletin 71 4 LR128 TRIM PACKAGE TYPE MR98H PILOT TYPE LR128 RELIEF VALVE OR BACKPRESSURE REGULATOR Figure 2 Type LR128 Features and Benefits Features a
14. ard or code limitation should not be exceeded 2 Temperature and or the body end connection may decrease these maximum pressure Table 3 Relief Set Pressure or Backpressure Control Ranges SET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH PILOT wig br m mm m mm SPRING MATERIAL 25 to 75 1 7 to 5 2 Powder coated steel ERAA01910A0 Green TO to 140 4 8 to 9 7 Powder coated steel ERAA01911A0 Red 130 to 200 9 0 to 13 8 Powder coated steel ERAAO2889A0 Blue 150 to 375 1 10 3 to 25 90 I Powder coated steel 1N943427142 Unpainted 1 150 to 375 psig 10 3 to 25 9 bar spring range is for the Type MR98HH pilot construction Type MR98H Pilot Type Description A backpressure regulator is a device that maintains a desired upstream pressure by varying the flow Type MR98H High pressure relief pilot for 25 to in response to changes in upstream pressure It 375 psig 1 7 to 25 9 bar set pressure Designed to functions the same as a relief valve i e it opens on handle inlet pressure up to 450 psig 31 0 bar increasing upstream pressure Principle of Operation Relief Valve A pressure relief valve is a throttling pressure control As long as the inlet pressure is below the set pressure device that limits pressure build up it opens to prevent the Type MR98H pilot control spring keeps the pilot the rise of internal pressure in excess of a specified valve plug closed Figure 3 Inlet pre
15. at the pilot spring case vent is pointed down Otherwise make sure the vent is protected so that rain moisture insects or any debris will not accumulate inside or block the vent assembly When installed indoors install remote venting of the pilot spring case as required by applicable codes and regulations Cavitation Sizing Note The cavitation sizing graph in Figure 4 applies to water only For cavitation sizing for other liquids contact your local Sales Office Use Figure 4 to determine cavitation sizing of Type LR128 The Cavitation Prediction Curve depicts P1 and P2 combinations where cavitation is likely to occur The curve shape was determined through analysis and lab confirmation on water Determine the desired inlet pressure and outlet pressure of the system and find the intersection of those values on the graph Continuous Service Region Cavitation is not expected in this region Damage to regulator components and piping is highly unlikely as a result of cavitation Intermittent Service Region Cavitation may occur Damage to regulator components and piping is possible This region is only suitable for intermittent service The risk of damage increases as P2 decreases and P1 increases or down and to the right on the graph Note Emerson denies responsibility for damage and voids the warranty if the product is used within the Full Cavitation Region see Figure 4 Full Cavitation Region Full cavitati
16. cities of the verified therefore regulators may Type LR128 relief valve or backpressure regulator be sized for 100 flow published at different percentages of pressure build up over capacities It is not necessary to reduce set pressure and selected set pressure Flows are in published capacities gallons per minute GPM and liters per minute L min of water The capacity information on the following pages is based on percentages of pressure build up over set pressure 1096 2096 3096 or 40 LR128 Bulletin 71 4 Table 12 1 at Offset Pressure Build Up Above Setpoint 2 BODY SIZE 1 In DN 25 2 In DN 50 3 In DN 80 4 In DN 100 SET PRESSURE PART NUMBER AND SPRING COLOR SPRING RANGE psig var 0 20 20 o 10 20 m aowe 10 30 aon 35 to 75 psig 2 4 to 5 2 bar 1D7455T0012 147 147 8 14 ese en n n n rd de rd ve Ed oe or rd de rd m n dd de Ed rd de Ed nnn afarer ror i LO e LO e O e LO X lt CN LO N O O B e B B zi v v v v 14 8 a E Q N gt O av 5 5 0 o gt c c gt gt c gt gt P as 0 Q Qa 23 a ce Tio SG
17. ffice for further information if a deviation from the standard recommendations are required Table 7 Flow and Sizing Coefficients for Type LR128 Main Valve at 100 Capacity REGULATING WIDE OPEN MAIN VALVE BODY SIZE COEFFICIENTS COEFFICIENTS IEC SIZING COEFFICIENTS C4 Cy C4 Bulletin 71 4 LR128 Table 8 Flow and Sizing Coefficients Type MR98H Pilot WIDE s um IEC SIZING COEFFICIENTS ___ Km F2 Table 9 Type 112 Restrictor Flow Coefficients Table 10 Diaphragm Material Selection Information 17E68 NITRILE NBR CRITERIA STANDARD 17E97 NITRILE NBR 17E88 FLUOROCARBON FKM Liquid Temperature 20 to 150 F 29 to 66 C to 150 F 18 to 66 C to 250 F 18 to 121 Best for low pressure differential General Applications and cold temperature service applications 1 Fluorocarbon FKM is limited to 200 F 93 C in hot water Best for abrasive or Best for high erosive service applications temperature applications Table 11 Approximate Weights Including Type MR98H Pilot and Restrictor BODY SIZE MAIN VALVE BODY Ibs kg DN NPT or SWE CL150 RF CL300 RF CL600 RF 3 8 103 47 107 49 110 50 123 56 139 63 145 66 159 72 192 87 Capacity Information Table 12 shows C values at different percentages of pressure build up over set pressure and selected Note set pressures Flow capacities are laboratory Table 13 shows the liquid flow capa
18. lve See Table 1 Type MR98H Pilot 450 psig 31 0 bar Relief Set Pressure Backpressure Control Ranges Table 3 Main Valve Plug Travel 1 in DN 25 0 37 in 9 4 mm 2 in DN 50 0 68 in 17 mm 3 in DN 80 0 98 in 25 mm 4 in DN 100 1 19 in 30 mm Main Valve Minimum Differential Pressure See Table 5 Main Valve Maximum Differential Pressure See Table 6 Temperature Capabilities 1 See Table 10 Main Valve Flow Direction Up through the center of the cage and down through the cage slots Main Valve Internal Inlet Strainer Sizes 1 in DN 25 12 Mesh 0 0661 in 1 68 mm 0 2 3 and 4 in DN 50 80 and 100 10 Mesh 0 0787 in 2 00 mm 3 Flow and IEC Sizing Coefficients Type LR128 Main Valve See Table 7 Type MR98H Pilot See Table 8 Type 112 Restrictor See Table 9 Flow Capacities See Table 13 Pressure Registration External 1 8 NPT Spring Case Vent Type Y602 12 Approximate Weights See Table 11 Options Pre piped Pilot Supply e Travel Indicator Construction Materials Type LR128 Main Valve Body WCC Steel CF8M or CF3M Stainless steel Bonnet LF2 Steel or 316 316L Stainless steel Bonnet Bushing 416 Hardened Stainless steel Cage 15 5 Stainless steel Spring 302 Stainless steel or 17 7 Stainless steel Top Plug 17 4 Stainless steel Bottom Plug 416 Stainless steel Inlet Strainer Stainless steel Diaphragm Nitrile NBR or Fluorocarbon FKM O Rings Nitrile NBR or Fluoroc
19. nd Benefits 6 Tight Shutoff The Type LR128 uses a diaphragm and metal plug eliminating the disadvantages of flexible element style regulators When open the metal plug deflects particles and debris away from the diaphragm The result is enhanced resistance to particle erosion which provides excellent shutoff over an extended life When closed loading pressure and the main spring push the diaphragm onto the tapered edged seat on the cage Debris Protection The specially engineered flow path along with the metal plug allows flow through the regulator without seat impingement The addition of an internal inlet strainer prevents large particles from entering the regulator minimizing damage to internal parts High Accuracy Multiple control pressure ranges offered by Type MR98H pilot and lower accuracy class inherent to pilot operated pressure regulator design provide the Type LR128 with tight and accurate control Long Life The robust design of the Type LR128 with its metal plug and specially engineered flow path allows flow through the regulator without seat impingement The diaphragm design eliminates the possibility of taking a set a common problem with flexible element style regulators To prevent damage the diaphragm is fully supported in both the open and closed positions These features enable the Type LR128 components to work longer with less wear and tear Full Usable Capacity Fisher
20. ne O Inlet body tap only standard 0 Inlet body tap with pre piped pilot supply L Inlet outlet body taps only L Inlet outlet body taps with pre piped pilot supply and pilot bleed Pilot Diaphragm Material Select One 1 Neoprene CR standard Fluorocarbon FKM Pilot Seat Gasket and O ring Material Select One Nitrile NBR standard L Fluorocarbon FKM Type MR98H Pilot Set Pressure Range Select One LO 25 to 75 psig 1 7 to 5 2 bar Green L 70 to 140 psig 4 8 to 9 7 bar Red 130 to 200 psig 9 0 to 13 8 bar Blue 150 to 375 psig 10 3 to 25 9 bar 1 Unpainted Main Valve Replacement Parts Kit Optional Yes send one diaphragm cartridge and O rings kit to match this order Pilot Replacement Parts Kit Optional LI Yes send one replacement kit to match this order Bulletin 71 4 LR128 Ordering Guide continued Specification Worksheet Application Specific Use Line Size Fluid Type and Specific Gravity Temperature Upstream Regulator Specifications Brand of upstream regulator Orifice size of the upstream regulator Wide open coefficient of the upstream regulator Maximum Inlet Pressure P1max Downstream Pressure Setting s P2 Maximum Flow Qmax Regulators Quick Order Guide Relief Valve Specifications Readily Available for Shipment Relief Valve Setpoint awan CE ELE Accuracy Requirements Need for Extremely Fast Response x
21. on expected This region is NOT recommended for service because damage to regulator components can be expected over time Cavitation damage can be avoided by dividing the total pressure drop into separate stages that lie within the Continuous Service Region Bulletin 71 4 LR128 CAVITATION PREDICTION 3751 26 0 335 23 1 295 I 20 3 255 I 17 6 215 14 8 psig bar 1751 12 1 OUTLET PRESSURE P2 135 9 3 95 6 6 55 3 8 15 1 0 0 45 90 135 180 225 2701 315 360 405 450 3 1 6 2 9 3 12 4 15 5 18 6 21 7 24 8 27 9 31 0 INLET PRESSURE P1 psig bar CONTINUOUS SERVICE REGION TT INTERMITTENT SERVICE REGION ERES FULL CAVITATION REGION Figure 4 Cavitation Sizing for Water Table 4 Build up Pressure Needed to Begin Opening and Fully Open Main Valve and Pressure Drop Needed to Reseat Pilot BUILDUP OVER SET BUILDUP OVER SET SPRING RANGE SPRING SET PRESSURE PRESSURE NEEDED TO PRESSURE NEEDED TO PART NUMBER AND BEGIN OPENING OF FULLY OPEN SPRING COLOR MAIN VALVE MAIN VALVEG PRESSURE DROP BELOW SET PRESSURE NEEDED TO RESEAT PILOT 25 to 75 psig 1 7 to 5 2 bar ERAA01910A0 Green IN 70 to 140 psig 4 8 to 9 7 ERAA01911A0 Red 130 to 200 psig 9 0 to 13 8 bar ERAA02889A0 Blue gt gt gt gt 150 to 375 psig 10 3 to 25 9 bar 1N943427142 Unpainted gt 1
22. ssure passes value Fisher relief valves cannot be used as ASME through the Type 112 restrictor and registers as safety relief valves loading pressure on top of the Type LR128 diaphragm Bulletin 1 4 L R128 TYPE 112 RESTRICTOR vl MR98H PILO MAIN SPRING DIAPHRAGM AND PLUG ASSEMBLY INTERNAL STRAINER M1217 INLET PRESSURE 77 OUTLET PRESSURE ____ ATMOSPHERIC PRESSURE LOADING PRESSURE TYPE LR128 WITH TYPE MR98H PILOT AND TYPE 112 RESTRICTOR Figure 3 Type LR128 Operational Schematic and plug assembly Force from the main spring in addition to inlet pressure bleeding through the Type 112 restrictor provides a downward loading pressure to keep the main valve diaphragm and plug assembly tightly shutoff When the inlet pressure rises above the set pressure the pressure on the pilot diaphragm overcomes the pilot control spring and opens the pilot valve plug The pilot then exhausts the loading pressure from the top of the main valve diaphragm and plug assembly The inlet pressure unbalance overcomes the main spring force and opens the diaphragm and plug assembly The pilot continuously exhausts process fluid when the inlet pressure is above the set pressure As the inlet pressure drops below the set pressure the pilot control spring closes the pilot valve plug and the exhaust to atmosphere stops Force from the main spring along with pilot loading pressure pushes the diaphragm and plug assembly on
23. to the tapered edge seat producing tight shutoff Backpressure Regulator As long as inlet pressure remains below set pressure the Type MR98H pilot control spring keeps the pilot valve plug closed Force from the main spring in addition to inlet pressure bleeding through the Type 112 restrictor provides downward loading pressure to keep the main valve diaphragm and plug assembly tightly shutoff When inlet pressure rises above the set pressure pressure on the pilot diaphragm overcomes the control spring to stroke the valve plug open The pilot then exhausts loading pressure from the top of the main valve diaphragm Inlet pressure unbalance overcomes the main spring force to open the main valve diaphragm and plug assembly As inlet pressure drops below set pressure the pilot control spring overcomes the diaphragm force to stroke the valve plug down to close Force from the main spring along with pilot loading pressure pushes the diaphragm and plug assembly onto the tapered edge seat producing tight shutoff Installation The robust design of the Type LR128 allows this relief valve or backpressure regulator to be installed indoors or outdoors Type LR128 is designed to withstand Bulletin 1 4 L R128 the elements The powder paint coating protects against minor impacts abrasions and corrosion When installed outdoors the Type LR128 does not require protective housing However the Type MR98H pilot should be oriented so th
24. tric Co All other marks are the property of their prospective owners Fisher is a mark owned by Fisher Controls International LLC a business of Emerson Process Management The contents of this publication are presented for informational purposes only and while every effort has been made to ensure their accuracy they are not to be construed as warranties or guarantees express or implied regarding the products or services described herein or their use or applicability We reserve the right to modify or improve the designs or specifications of such products at any time without notice Emerson Process Management Regulator Technologies Inc does not assume responsibility for the selection use or maintenance of any product Responsibility for proper selection use and maintenance of any Emerson Process Management Regulator Technologies Inc product remains solely with the purchaser 3 LET EMERSON OEmerson Process Management Regulator Technologies Inc 2012 2014 All Rights Reserved
Download Pdf Manuals
Related Search