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Instrumentation Process Control - AR Thomson Group

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Valves<br />

Pressure Regulators<br />

Relief Valves<br />

Valve<br />

<strong>Group</strong>s<br />

Relief<br />

Valves<br />

Model<br />

Series<br />

RL<br />

RH<br />

MPRA<br />

Maximum<br />

Operating<br />

Pressure<br />

400 psi<br />

28 bar<br />

6000 psi<br />

414 bar<br />

20999 psi<br />

1448 bar<br />

Temperature Cv<br />

RL4 Series (Catalog 4131-RL)<br />

Handle for fi eld maintenance<br />

Externally adjustable pressure<br />

settings while valve is in operation<br />

Seven different springs<br />

RH4 Series (Catalog 4131-RH)<br />

Eight springs<br />

Manual override option with positive<br />

stem retraction is available for<br />

pressures up to 1500 psi (103 bar)<br />

Quick Couplings<br />

Body<br />

Material Seal Material End Connections<br />

Buna-N Rubber<br />

Ethylene<br />

Propylene Rubber<br />

Highly Fluorinated<br />

Fluorocarbon<br />

Fluorocarbon<br />

Rubber<br />

Steel<br />

Stainless<br />

Min Max Max<br />

-70 F<br />

-57C<br />

400 F<br />

204 C<br />

0.8 x x x x x x<br />

-70 F<br />

-57C<br />

400 F<br />

204 C<br />

0.4 x x x x x x<br />

-10 F<br />

-23C<br />

400 F<br />

204 C<br />

0.7 x x x x x<br />

Manual override option with positive<br />

stem retraction is available for the<br />

full working pressure range<br />

Color coded springs and labels<br />

indicate spring cracking range<br />

Preset from factory and comes with<br />

standard springs<br />

Neoprene Rubber<br />

Min Max<br />

1/4 in 1/4 in<br />

6mm 8mm<br />

1/4 in 1/4 in<br />

6mm 8mm<br />

1/2 in 9/16 in<br />

n/a n/a<br />

Pipe Fittings<br />

Catalog<br />

4131-RL<br />

4131-RH<br />

4234<br />

11

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