Low Pressure Proportional Relief Valves

RL Series proportional relief valves protect pressure sensitive equipment in systems with working pressures up to 300 psig (20.6 bar) and set pressures from 10 to 225 psig (0.7 to 15.5 bar).

Set Pressures:

• Temperature Range: -40 to 300°F (-40 to 300°C)
• MAWP:  300 psig (20.6 bar)
• Set Pressure Range: 10 to 225 psig (0.7 to 15.5 bar) One spring for the full set pressure range. RL Series valves are shipped with springs installed.

End Connections:

• RL3: 1/4 in., 6 mm and 8 mm tube ends, 1/4 in. NPT and BSPT pipe ends
• RL4: 1/2 in. and 12 mm tube ends 1/2 in. NPT and BSPT pipe ends

 Options

• Factory set valves
• Manual override handle
• Seal Materials
• Fluorocarbon FKM (Standard)
• Nitrile
• Ethylene Propylene

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)

Spring kits are needed for all standard RH Series Proportional Relief Valves. Spring kits are used to set the pressure for R-Series proportional relief valves. Select spring kits by valve size, RH3 or RH4, then set pressure range.