High Pressure Proportional Relief Valves

RH Series proportional relief valves protect pressure sensitive equipment in systems with working pressures up to 6000 psig (413 bar) and set pressures from 50 to 6000 psig (3.4 to 413 bar). Standard RH Series proportional relief valves are shipped without springs. To order spring kits, see the Spring Kit catalog category.

Maximum Working Pressure: 6000 psig (413 bar)
Set Pressure: 50 to 6000 psig (3.4 to 413 bar) Multiple springs for a selection of set pressure ranges improve accuracy and reduce hysteresis
Temperature Range: -10 to 275°F (-23 to 135°C)
End Connections:

RH3: 1/4 in., 6 mm and 12 mm tube ends 1/4 in. NPT and BSPT pipe ends
RH4: 1/2 in. and 12 mm tube ends 1/2 in. NPT and BSPT pipe endsOptions:

Choice of Duolok, Griplok and Unilok tube end connections 316 SS valve bodies
Factory set valves R Series valves are available with springs factory-set to a specified set pressure. Valves are set, tested, locked, and tagged with the set pressure. Certificates of testing are included.
Manual override handle
Seal Materials

Fluorocarbon FKM (Standard)
Nitrile
Ethylene Propylene
Perfluoroelastomer FFKM (RH3 valves only)

Unit of Measure

Items	RH34MRT4FRT-316 Proportional Relief Valves - High Pressure	RH34MRT4FRT-316-BN Proportional Relief Valves - High Pressure	RH34MRT4FRT-316-EP Proportional Relief Valves - High Pressure	RH34MRT4FRT-316-FFKM Proportional Relief Valves - High Pressure	RH34PM4PF-316 Proportional Relief Valves - High Pressure
Description	N/A Valve, Proportional Relief, High Pressure, Body Material: 316 SS, 1/4 in Male BSPT x 1/4 in Female BSPT, Seal Material: FKM, Working Pressure: 6000, Temperature: -10 to 275	N/A Valve, Proportional Relief, High Pressure, Body Material: 316 SS, 1/4 in Male BSPT x 1/4 in Female BSPT, Seal Material: Nitrile, Working Pressure: 6000, Temperature: 0 to 250	N/A Valve, Proportional Relief, High Pressure, Body Material: 316 SS, 1/4 in Male BSPT x 1/4 in Female BSPT, Seal Material: EPDM, Working Pressure: 6000, Temperature: 30 to 250	N/A Valve, Proportional Relief, High Pressure, Body Material: 316 SS, 1/4 in Male BSPT x 1/4 in Female BSPT, Seal Material: FFKM, Working Pressure: 6000, Temperature: 30 to 200	N/A Valve, Proportional Relief, High Pressure, Body Material: 316 SS, 1/4 in MNPT x 1/4 in FNPT, Seal Material: FKM, Working Pressure: 6000, Temperature: -10 to 275
Body Material	N/A 316 SS
Connection 1 - Type	N/A Male BSPT	N/A Male BSPT	N/A Male BSPT	N/A Male BSPT	N/A MNPT
Connection 1 - Size	N/A 1/4-19	N/A 1/4-19	N/A 1/4-19	N/A 1/4-19	N/A 1/4-18
Connection 2 - Type	N/A Female BSPT	N/A Female BSPT	N/A Female BSPT	N/A Female BSPT	N/A FNPT
Connection 2 - Size	N/A 1/4-19	N/A 1/4-19	N/A 1/4-19	N/A 1/4-19	N/A 1/4-18
A Max	N/A 2.70 in68.6 mm
C	N/A 1.17 in29.7 mm
D	N/A 0.41 in10.4 mm
E Max	N/A 3.89 in98.8 mm
Orifice	N/A 0.14 in3.6 mm
O-ring Material	N/A FKM	N/A Nitrile Buna Rubber	N/A EPDM	N/A FFKM	N/A FKM
B	N/A 1.19 in30.2 mm
Set Pressure Range	N/A 50 to 6000 psig3.4 to 413 bar
Working Pressure	N/A 6000 psig413 bar
Product Descriptions	N/A Male to Female ISO Tapered Proportional Relief Valve	N/A Male to Female ISO Tapered Proportional Relief Valve	N/A Male to Female ISO Tapered Proportional Relief Valve	N/A Male to Female ISO Tapered Proportional Relief Valve	N/A Male to Female NPT Proportional Relief Valve
End Connection Type	N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered	N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered	N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered	N/A Male British Standard Pipe Tapered by Female British Standard Pipe Tapered	N/A Male National Pipe Thread by Female National Pipe Thread