Proportional Relief Valves
- Provide simple, reliable, over-pressure protection for a variety of general-industry applications
- Have easy external set pressure adjustment
- Are available with high- and low- pressure ratings
High-Pressure Proportional Relief Valves (R3A Series and R4 Series)
Specifications
Working Pressures
up to 6000 psig (413 bar)
Springs
multiple springs available for a selection of pressure ranges
Low-Pressure Proportional Relief Valves (RL3 Series and RL4 Series)
Specifications
Working Pressures
up to 300 psig (20.6 bar)
Springs
one spring for the full set pressure range
Proportional Relief Valves (R3A,R4, RL3, and RL4 Series)
Options
Seal Materials
Fluorocarbon FKM is standard. Buna N, ethylene propylene, and neoprene are available factory-installed or in replacement seal kits for field assembly.
Spring Kits
Replacement spring kits are available for all models
Manual Override Handles
A manual override handle opens the valve without changing the set pressure. Available factory-installed or in kits for field assembly.
Special Cleaning and Packaging
Swagelok Special Cleaning and Packaging (SC-11) to ensure compliance with product cleanliness requirements stated in ASTM G93 Level C.
Proportional Relief Valves (IPT Series)
Options
Working Pressures
up to 20 000 psig (1378 bar)
Set Pressures
1000 to 20 000 psig (68.9 to 1378 bar)
Operation
Set or adjustable operation
Temperature
up to 250°F (121°C)
End Connections
Cone and thread (3/8 and 9/16 in., inlet), Swagelok medium-pressure tube fitting (3/8, 1/2, and 9/16 in., inlet) female NPT (3/4 in., outlet)
Proportional Safety-Relief Valve, High-Pressure (PRV Series)
Specifications
Working Pressures
up to 5800 psig (400 bar)
Set Pressure
145 to 5800 psig (10.0 to 400 bar)
Seal Materials
Fluorocarbon FKM and nitrile
