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Bulletin 71.2:LR125

Specications

The Specications section lists the specications for the Type LR125 regulator. Factory specication is stamped

on the nameplate fastened on the regulator at the factory.

Main Valve Body Sizes, End Connection Styles and

Structural Design Ratings

(1)(2)

See Table 1

Maximum Inlet Pressures

(1)

Type LR125 Main Valve: See Table 1

Type MR95H Pilot: See Table 2

Type 112 Restrictor: 1500 psig / 103 bar

Maximum Outlet Pressure

Type LR125 Main Valve: See Table 1

Type MR95H Pilot: See Table 2

Outlet (Control) Pressure 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 5

Temperature Capabilities

(1)

See Table 4

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)

(3)

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

10 Mesh (0.0787 in. / 2 mm)

(3)

Regulating Capacities

See Table 11

Flow and IEC Sizing Coefcients

Type LR125 Main Valve: See Table 6

Type MR95H Pilot: See Table 7

Type 112 Restrictor: See Table 8

Pressure Registration

External: 1/2 NPT

Spring Case Vent

Type Y602-12

Approximate Weights

See Table 9

Options

• Pre-piped Pilot Supply

• Travel Indicator

Construction Materials

Type LR125 Main Valve

Body: WCC Steel, CF8M or CF3M Stainless Steel

Bonnet: Steel or Stainless Steel

Bonnet Bushing: Steel or Stainless Steel

Cage: Stainless steel

Spring: Stainless steel

Top Plug: Stainless steel

Bottom Plug: Stainless steel

Internal Inlet Strainer: Stainless steel

Diaphragm: Nitrile (NBR) or Fluorocarbon (FKM)

O-rings: Nitrile (NBR) or Fluorocarbon (FKM)

Flanged Locknut: Stainless Steel

Backup Rings: Polytetrauoroethylene (PTFE)

Upper Spring Seat: Stainless steel

Indicator Protector and Cover: Plastic

Indicator Stem: Stainless steel

Indicator Fitting: Stainless steel

Travel Indicator Plug: Stainless steel

Type MR95H Pilot

Body: WCC Steel or CF8M Stainless Steel

Spring Case: WCC Steel or CF8M Stainless Steel

Orice: Stainless Steel

Diaphragm: Neoprene (CR) or Fluorocarbon (FKM)

Disk: Nitrile (NBR) 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: Stainless steel

Retainer: Stainless steel

Pipe Plug: 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 Ofce.

3. Nominal sieve opening

Debris Protection—The specially engineered ow

path, along with the metal plug, allows ow 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 MR95H pilot and lower accuracy class

inherent to pilot operated pressure regulator design

provide the Type LR125 with tight and accurate control.

Long Life—The robust design of the Type LR125 with

its metal plug and specially engineered ow path allows

ow through the regulator without seat impingement.

The diaphragm design eliminates the possibility of

taking a “set”, a common problem with exible element

1 2 3 4 5 6 7 ... 11 12

Bulletin 71.2:LR125 1

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