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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)
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RH3-Male-to-Female-Render

Proportional Relief Valves - High Pressure
RH3-Male-to-Female-Render

Proportional Relief Valves - High Pressure
RH3-Male-to-Female-Render

Proportional Relief Valves - High Pressure
RH3-Male-to-Female-Render

Proportional Relief Valves - High Pressure
RH3-Male-to-Female-Render

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 in
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 in
A Max N/A 2.70 in68.6 mm
C N/A 1.17 in20.7 mm
D N/A 0.41 in10.4 mm
E Max N/A 3.89 in98.8 mm
Orifice N/A N/A 0.14 in N/A 0.14 in N/A 0.14 in N/A
O-ring Material N/A FKM N/A Nitrile 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 Female ISO/BSPT N/A Female ISO/BSPT N/A Female ISO/BSPT N/A Female ISO/BSPT N/A Male NPT to Female NPT