Emerson LR128 Scheda Tecnica Scaricare il pdf (Pagina 1)

Bulletin 71.4:LR128

D103577X012

November 2014

www.fisherregulators.com

Type LR128 Relief Valve or

Backpressure Liquid Regulator

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exibleelementstyle

regulatorsandthespeciallyengineeredowpath

deects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.

• Rugged design

• Reliable

• Thoroughly tested

• Internally actuated

• Compact

• 1, 2, 3 and 4 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

Backpressure Liquid Regulator

1 2 3 4 5 6 ... 15 16

Sommario

Pagina 1 - Backpressure Liquid Regulator

Bulletin 71.4:LR128D103577X012November 2014www.fisherregulators.comType LR128 Relief Valve or Backpressure Liquid RegulatorFigure 1. Type LR128 Relief

Pagina 2

Bulletin 71.4:LR12810Capacity InformationNoteFlow capacities are laboratory veried; therefore, regulators may be sized for 100% ow published capacit

Pagina 3

Bulletin 71.4:LR12811SPRING RANGE, PART NUMBER AND SPRING COLORSET PRESSUREBODY SIZE1 In. / DN 25 2 In. / DN 50 3 In. / DN 80 4 In. / DN 100psig bar

Pagina 4

Bulletin 71.4:LR12812SPRING RANGE, SPRING PART NUMBER ANDSPRING COLORSET PRESSUREBODY SIZE1 In. / DN 25 2 In. / DN 50psig bar10% 20% 30% 40% 10% 20% 3

Pagina 5

Bulletin 71.4:LR12813Table 13. Capacity(1), Water (GPM / L/min) for 3 and 4 in. / DN 80 and 100 Bodies at % Offset (Pressure Build-Up Above Setpoint

Pagina 6

Bulletin 71.4:LR12814Figure 5. Type LR128 Dimensions Schematic Table 15. Type LR128 DimensionsBODYSIZE, In. / DNDIMENSIONS, In. / mmA BD D1E GMT VCL15

Pagina 7

Bulletin 71.4:LR12815Ordering InformationCarefullyrevieweachspecicationonpage2,thencompletetheOrderingGuideonthispage.Ifapilotsetpo

Pagina 8

Pagina 9

Bulletin 71.4:LR1282SpecicationsMain Valve Body Sizes, End Connection Styles and Structural Design Ratings(1)(2) See Table 1Maximum Inlet Pressure(1

Pagina 10 - Bulletin 71.4:LR128

Bulletin 71.4:LR12831091326TYPE MR98H PILOTTYPE LR128 RELIEF VALVE OR BACKPRESSURE REGULATOR57TRIM PACKAGEW739811TYPE MR98H PILOTFigure 2. Type LR128

Pagina 11

Bulletin 71.4:LR128481291011W734578124Figure 2. Type LR128 Features and Bene ts (continued)and shows the actual valve position. The travel indicator

Pagina 12

Bulletin 71.4:LR1285MAIN VALVE BODY SIZEMAIN VALVE BODY MATERIALEND CONNECTION STYLE(2)STRUCTURAL DESIGN RATING(3)MAXIMUM OPERATING RELIEF (INLET) PR

Pagina 13

Bulletin 71.4:LR1286Figure 3. Type LR128 Operational SchematicINLET PRESSUREOUTLET PRESSUREATMOSPHERIC PRESSURELOADING PRESSURETYPE LR128 WITH TYPE MR

Pagina 14

Bulletin 71.4:LR1287the elements. The powder paint coating protects against minor impacts, abrasions and corrosion. When installed outdoors, the Type

Pagina 15

Bulletin 71.4:LR1288Table 4. Build-up Pressure Needed to Begin Opening and Fully Open Main Valve and Pressure Drop Needed to Reseat PilotSPRING RANGE

Pagina 16

Bulletin 71.4:LR1289Table 5. Type LR128 Main Valve Minimum Differential Pressure(1)MAIN VALVE BODY SIZEDIAPHRAGMMINIMUM DIFFERENTIAL, PERCENT OF CAPA