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Type LR128

Introduction

Scope of the Manual

This Instruction Manual provides installation, startup,

adjustment, maintenance and parts ordering information

for Type LR128 relief valve or backpressure regulator,

1/2 NPT Type MR98H pilot and Type 112 restrictor.

Product Description

The Type LR128 pilot-operated, relief valve or

backpressure regulator is used for liquid applications

and include a Type 112 restrictor and a 1/2 NPT

Type MR98H pilot.

1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.

2. Nominal sieve opening.

Main Valve Body Sizes, End Connection Styles

and Structural Design Ratings

(1)

See Table 1

Maximum Inlet Pressures

(1)

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 Valve: See Table 1

Type MR98H Pilot: 450 psig / 31.0 bar

Relief Set Pressure/Backpressure Control Ranges

See 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 Pressures

(1)

See Table 6

Main Valve Maximum Differential Pressures

(1)

See Table 7

Main Valve Internal Inlet Strainer Sizes

1 in. / DN 25:

12 Mesh (0.0661 in. / 1.68 mm)

(2)

2, 3 and 4 in. / DN 50, 80 and 100:

10 Mesh (0.0787 in. / 2.00 mm)

(2)

Temperature Capabilities

(1)

See Table 11

Pressure Registration

External: 1/8 NPT

Spring Case Vent

Type Y602-12

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

Type LR128 Main Valve (continued)

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 Fluorocarbon (FKM)

Flanged Locknut: 17-4 Stainless steel

Backup Rings: Polytetrauoroethylene (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 CF8M Stainless steel

Spring Case: WCC Steel or CF8M Stainless steel

Orice: 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)

Options

• Pre-piped Pilot Supply

• Travel Indicator

Specications

Specications for the Type LR128 relief valve or backpressure regulator are shown below. Other information for the main

valve appears on the nameplate. The control spring range for the pilot is marked on the nameplate of Type MR98H pilot.

1 2 3 4 5 6 7 ... 27 28

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