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Bulletin 71.4:LR128

MAIN VALVE

BODY SIZE

MAIN VALVE

BODY

MATERIAL

END CONNECTION STYLE

(2)

STRUCTURAL DESIGN

RATING

(3)

MAXIMUM OPERATING

RELIEF (INLET)

PRESSURE INCLUDING

BUILD-UP

(3)

MAXIMUM OPERATING

OUTLET PRESSURE

In. DN psig bar psig bar psig bar

1, 2, 3

and 4

25,

50, 80

and 100

WCC Steel

NPTorSWE

(1 and 2 in. only)

1500 103 450 31.0 450 31.0

CL150 RF 290 20.0 290 20.0 290 20.0

CL300 RF 750 51.7

450 31.0 450 31.0CL600 RF 1500 103

PN 16/25/40 RF 580 40.0

CF8M

Stainless steel

NPT

(1 and 2 in. only)

1440 99.2 450 31.0 450 31.0

CL150 RF 275 19.0 275 19.0 275 19.0

CL300 RF 720 49.6

450 31.0 450 31.0CL600 RF 1440 99.2

PN 16/25/40 RF 580 40.0

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Ofce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 1. Type LR128 Main Valve Body Sizes, End Connection Styles, Structural Design Ratings and Maximum Operating

Relief (Inlet) Pressure

(1)

Table 2. Type MR98H Pilot Maximum Cold Working Pressure

(1)(2)

BODY SIZE

BODY AND SPRING

CASE MATERIAL

MAXIMUM INLET PRESSURE MAXIMUM OUTLET PRESSURE

1/2 NPT

Steel

Stainless steel

450 psig / 31.0 bar 450 psig / 31.0 bar

1.Thepressure/temperaturelimitsinthisBulletinandanyapplicablestandard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

PILOT

SET PRESSURE RANGE SPRING WIRE DIAMETER SPRING FREE LENGTH

SPRING MATERIAL

SPRING PART NUMBER

AND COLOR

psig bar In. mm In. mm

Type MR98H

25 to 75

70 to 140

130 to 200

150 to 375

(1)

1.7 to 5.2

4.8 to 9.7

9.0 to 13.8

10.3 to 25.9

(1)

0.234

0.283

0.331

0.394

5.94

7.19

8.41

10.0

2.595

2.44

2.250

5.063

65.9

62.0

57.2

129

Powder-coated steel

ERAA01910A0,Green

ERAA01911A0,Red

ERAA02889A0,Blue

1N943427142 , Unpainted

1. 150 to 375 psig / 10.3 to 25.9 bar spring range is for the Type MR98HH pilot construction.

Pilot Type Description

Type MR98H – High-pressure relief pilot for 25 to

375 psig / 1.7 to 25.9 bar set pressure. Designed to

handle inlet pressure up to 450 psig / 31.0 bar.

Principle of Operation

A pressure relief valve is a throttling pressure control

device that limits pressure build-up, it opens to prevent

theriseofinternalpressureinexcessofaspecied

value. Fisher

reliefvalvescannotbeusedasASME

safety relief valves.

A backpressure regulator is a device that maintains

adesiredupstreampressurebyvaryingtheow

in response to changes in upstream pressure. It

functions the same as a relief valve, i.e., it opens on

increasing upstream pressure.

Relief Valve

As long as the inlet pressure is below the set pressure,

the Type MR98H pilot control spring keeps the pilot

valve plug closed (Figure 3). Inlet pressure passes

through the Type 112 restrictor and registers as

loading pressure on top of the Type LR128 diaphragm

1 2 3 4 5 6 7 8 9 10 ... 15 16

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Emerson LR128 Scheda Tecnica Pagina 5

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