Pressure Relief Valves

Safety relief valves are designed to be fast-acting components that protect systems with the potential for sudden pressure spikes. These valves may sit dormant for indeterminate amounts of time before needing to be used, so it’s crucial that they always work as intended. Our safety relief valves are available in low-leak and tight hysteresis configurations. To ensure reliable operation, we 100% test each component for crack, flow point and reseat pressure.

Our safety relief valves are available in 0.187, 0.250, 0.281, and 0.375 inch insert diameters and 0.687 inch threaded configurations. They are constructed entirely of stainless steel and are available screened and unscreened. Built-in damping ensures quiet operation. Cracking pressures range from 20 to 5900 psid.

Unlike safety relief valves, pressure regulating valves operate more frequently. The Lee Company offers a “momentum-free” design concept for these applications. These valves compensate for momentum forces that upset the normal force balance of typical direct acting valves. The result is a valve that is stable throughout the operating range. These valves are available in 0.375 and 0.500 inch diameters with cracking pressures from 50-500 psid.

Instead of relying on a metal-to-metal seal, these valves incorporate an elastomeric or polymeric seal for a zero leak design, perfect for situations where eliminating leakage is a critical requirement of hydraulic or pneumatic applications. Zero Leak Relief Valves are available in a 0.187 inch diameter for low-pressure applications and a 0.281 inch diameter for cracking pressures ranging from 800 to 4700 psid.

The Hi-Q PRV is designed for applications that require both a high relief pressure and a high flow rate in a line removable unit (LRU). The valve can relieve pressures up to 5400 psid and flow rates over 19 GPM, and uses a side inlet flow path to minimize the installation boss size and weight.