The Lee Company's new 375 High Pressure PRI is a relief valve designed for optimal performance in applications with high backpressure. This new relief valve has shown stable relief flow performance in applications with backpressures up to 850 psig. (read more)

The UFDV diaphragm valve is a pressure control device. The selected pressure is adjustable, and applied via a spring-loaded diaphragm. The valves are available in a variety of materials and with a locking set-screw for OEM use, or an easily-adjusted control knob. An optional vacuum or pressure gauge is available. (read more)

New high performance, 5000 psi, direct-acting relief valves provide an effective pressure limiting solution for systems requiring dynamic relief, low hysteresis, low pressure rise, and low internal leakage. (read more)

All of our relief valves are custom designed and manufactured to our customers' individual and unique application requirements. We try to use existing valve designs whenever possible to help keep costs to a minimum. As a custom designer, we are able to make minor adjustments in the original design to meet your requirements. Check out our website and contact us for additional information. (read more)

Series 69 is an industry standard Valve for liquid relief, liquid by-pass and over protection. Usages include liquid relief and overprotection, (read more)

Hayward Pressure Relief Valves protect piping system components from damage due to over pressurization. The valves work by sensing system pressure. When the system pressure exceeds the set pressure, the force of the excess pressure moves the valve piston off its seat to relieve the excess pressure and diverts some of the flow out the discharge port. (read more)

The Thermal Relief Valve passively relieves liquid fuel system pressure build-up due to thermal expansion of the fuel during turbine operation on gas. This avoids unintended evacuation of fuel into the combustion chamber during gas operation and helps prolong the life of check valves and other key components of the liquid fuel system that are normally purged with air during operation on gas.... (read more)

SC Hydraulic Engineering direct acting relief valves are available in 1/4" NPT and 9/16-18 60° cone high pressure fitting for relieving pressures from 100 to 60,000 psi. The stainless steel construction makes these valves suitable for hydraulic fluids, water and gas applications. Standard seal material is Buna-N (-N). Substitute a "-V" for Viton® or "-E" for EPR after the part number for the... (read more)

Performance Specifications:

Operating Fluid: Air, Nitrogen

Operating Temperature: 550° F

Cracking Pressure: 70± 8 PSIG

Flow Rate: 5.5 SCFM at 100 PSIG maximum

Leakage: 40 Bubbles/minute maximum at 300 PSIG applied in checked direction

Notes: Valve utilizes high temperature Polymer Poppet and Inconel spring. (read more)

The valve instantly opens when the pressure in the pipeline exceeds the preset safe level, thus relieving excessive pressure from the pipeline. When the pressure returns to normal, the valve closes slowly, at an adjustable speed.The valve also can be used to sustain upstream pressure to a preset pressure value. (read more)