Data Sheet

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Bulletin 71.2:LR125

D103575X012

November 2014

www.fisherregulators.com

Type LR125 Pressure Reducing Liquid Regulator

Figure 1. Type LR125 Pressure Reducing Liquid Regulator

Introduction

The Type LR125 pilot-operated, pressure reducing

regulator is designed for liquid industrial/commercial

applications. The Type LR125 provides smooth

operation, tight shutoff and long life. Its internally

actuated metal plug eliminates disadvantages

associated with  exible element style regulators, and

the specially engineered  ow path de ects debris,

protecting the seat from damage and erosion. The

Type LR125 is used in conjunction with a Type MR95H

pilot and Type 112 restrictor. An internal inlet strainer

prevents large particles from entering the main valve,

limiting damage to internal parts.

Features and Bene ts

Tight Shutoff—The Type LR125 uses a diaphragm

and metal plug, eliminating the disadvantages of

 exible element style regulators. When open, the

metal plug de ects 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.

• Rugged design

• Reliable

• Thoroughly tested

• Internally actuated

• Compact

• 1, 2, 3, 4 in. body sizes

• Recommended for water

and oil applications

• Full SST construction

available for harsh

environments

• API 614 Compliant

Type LR125 Pressure Reducing Liquid Regulator

Summary of content (12 pages)

PAGE 1
Bulletin 71.2:LR125 November 2014 Type LR125 Pressure Reducing Liquid Regulator • Rugged design • Reliable • Thoroughly tested • Internally actuated • Compact • 1, 2, 3, 4 in. body sizes • Recommended for water and oil applications • Full SST construction available for harsh environments • API 614 Compliant Figure 1. Type LR125 Pressure Reducing Liquid Regulator Features and Benefits The Type LR125 pilot-operated, pressure reducing regulator is designed for liquid industrial/commercial applications.
PAGE 2
Bulletin 71.2:LR125 Specifications The Specifications section lists the specifications for the Type LR125 regulator. Factory specification is stamped on the nameplate fastened on the regulator at the factory.
PAGE 3
Bulletin 71.2:LR125 3 7 7 W5092 W7398 TYPE MR95H PILOT 8 TRIM PACKAGE 4 11 9 TYPE MR95H PILOT 10 1 5 6 12 2 W7345 W7344 TYPE LR125 PRESSURE REDUCING REGULATOR Figure 2. Type LR125 Features and Benefits style regulators. To prevent damage, the diaphragm is fully supported in both the open and closed positions. These features enable the Type LR125 components to work longer with less wear and tear. 5 Full Usable Capacity—Fisher® branded regulators are laboratory tested.
PAGE 4
Bulletin 71.2:LR125 TYPE MR95H PILOT TYPE 112 RESTRICTOR CONTROL SPRING DIAPHRAGM SUPPLY LINE VALVE PLUG MAIN SPRING DIAPHRAGM AND PLUG ASSEMBLY M1215 INLET PRESSURE INTERNAL STRAINER OUTLET PRESSURE ATMOSPHERIC PRESSURE LOADING PRESSURE TYPE LR125 WITH TYPE MR95H PILOT AND TYPE 112 RESTRICTOR Figure 3. Type LR125 Operational Schematic 12 Powder Paint Coating—Carbon steel body is powder paint coated providing superior impact, abrasion and corrosion resistance.
PAGE 5
Bulletin 71.2:LR125 Table 1. Type LR125 Main Valve Body Sizes, End Connection Styles, Structural Design Ratings and Maximum Operating Inlet Pressures(1) MAIN VALVE BODY SIZE In. MAIN VALVE BODY MATERIAL DN psig 25, 50, 80 and 100 CF8M Stainless steel MAXIMUM OPERATING INLET PRESSURE(3) bar psig bar 1500 103 300 20.7 290 20.0 290 20.0 CL300 RF 750 51.7 300 20.7 NPT or SWE (1 and 2 in.
PAGE 6
Bulletin 71.2:LR125 CAVITATION PREDICTION 150 / 10.3 135 / 9.3 120 / 8.3 OUTLET PRESSURE (P2) psig / bar 105 / 7.2 90 / 6.2 75 / 5.2 60 / 4.1 45 / 3.1 30 / 2.1 15 / 1.0 0 30 / 2.1 60 / 4.1 90 / 6.2 120 / 8.3 150 / 10.3 180 / 12.4 210 / 14.5 240 / 16.5 270 / 18.6 300 / 20.7 INLET PRESSURE (P1) psig / bar CONTINUOUS SERVICE REGION INTERMITTENT SERVICE REGION FULL CAVITATION REGION Figure 4. Cavitation Sizing for Water Table 5.
PAGE 7
Bulletin 71.2:LR125 Table 7. Flow and Sizing Coefficients for Type MR95H Pilot BODY SIZE, IN. / DN WIDE-OPEN COEFFICIENT 1/2 / 15 2.9 IEC SIZING COEFFICIENTS C1 Km 35.5 0.79 Cv XT FD FL 0.797 0.70 0.89 Km = FL2 Table 8. Type 112 Restrictor Flow Coefficients RESTRICTOR SETTING Cv Setting 2 0.03 Setting 4 0.07 Setting 6 0.14 Setting 8 0.17 C1 35 Table 9. Approximate Weights Including Type MR95H Pilot and Restrictor MAIN VALVE BODY, LBS / kg BODY SIZE In.
PAGE 8
Bulletin 71.2:LR125 Table 10. Cv(1) at % Droop (Pressure Offset Below Setpoint)(2) SPRING RANGE AND COLOR 15 to 30 psig / 1.0 to 2.1 bar Yellow 25 to 75 psig / 1.7 to 5.2 bar Green OUTLET PRESSURE psig bar 15 1.0 20 1.4 30 2.1 25 1.7 50 3.4 75 5.2 70 4.8 100 6.9 125 8.6 150 10.3 70 to 150 psig / 4.8 to 10.
PAGE 9
Bulletin 71.2:LR125 Table 11. Capacity(1), Water (GPM / L/min) for 1 and 2 in. / DN 25 and 50 Bodies at % Droop (Pressure Offset Below Setpoint)(2) SPRING RANGE AND COLOR OUTLET PRESSURE psig 15 15 to 30 psig / 1.0 to 2.1 bar Yellow 20 30 25 25 to 75 psig / 1.7 to 5.2 bar Green 50 75 70 100 bar 1.0 1.4 2.1 1.7 3.4 5.2 4.8 6.9 70 to 150 psig / 4.8 to 10.3 bar Red 125 150 8.6 10.3 1 IN. / DN 25 INLET 10% 20% 2 IN.
PAGE 10
Bulletin 71.2:LR125 Table 11. C apacity(1), Water (GPM / L/min) for 3 and 4 in. / DN 80 and 100 Bodies at % Droop (Pressure Offset Below Setpoint)(2) (continued) SPRING RANGE AND COLOR OUTLET PRESSURE psig 15 15 to 30 psig / 1.0 to 2.1 bar Yellow 20 30 25 25 to 75 psig / 1.7 to 5.2 bar Green 50 75 70 100 bar 1.0 1.4 2.1 1.7 3.4 5.2 4.8 6.9 70 to 150 psig / 4.8 to 10.3 bar Red 125 150 8.6 10.3 INLET 3 IN. / DN 80 10% 20% 4 IN.
PAGE 11
Bulletin 71.2:LR125 TYPE MR95H PILOT M OPTIONAL INDICATOR COVER 1/4 NPT VENT TYPE 112 RESTRICTOR T TRAVEL INDICATOR COVER REMOVAL CLEARANCE 1/2 NPT CONTROL LINE CONNECTION 1/4 NPT PILOT SUPPLY CONNECTION E D D1 V VALVE TRIM REMOVAL CLEARANCE G A B ERAA00985_B TYPE LR125 WITH TYPE MR95H PILOT Figure 5. Type LR125 Dimensions Table 12. Type LR125 Dimensions DIMENSIONS, IN. / mm BODY SIZE In. DN 1 25 2 50 3 80 4 100 A CL150 RF CL300 RF 3.62 / 91.9 5.0 / 127.0 5.9 / 149.3 6.9 / 176.
PAGE 12
Bulletin 71.2:LR125 Ordering Guide (continued) Pilot Diaphragm Material (Select One) Neoprene (CR) (standard)*** Fluorocarbon (FKM)** Pilot Valve Plug Material (Select One) Nitrile (NBR) (standard)*** Fluorocarbon (FKM)*** Type MR95H Pilot Outlet Pressure Range (Select One) 15 to 30 psig / 1.0 to 2.1 bar, Yellow*** 25 to 75 psig / 1.7 to 5.2 bar, Green*** 70 to 150 psig / 4.8 to 10.