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Pressure Relief Valves

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Pressure Relief Valves for Other Industries

Works Well Under Pressure

Pressure relief valves are a critical component of fuel, hydraulic, and pneumatic systems in products across many industries. These valves can serve one of three functions – safety relief, pressure regulation, or protection against thermal expansion. Lee Pressure Relief Inserts are specifically designed for these functions, helping to guarantee the safety and reliability of your product.

Like all products from The Lee Company, pressure relief valves are small, lightweight, and incredibly durable – enough to serve out the entire product lifecycle without replacement. In addition, these products are available in a range of sizes and are engineered to withstand various pressure ranges. We offer numerous configurations to ensure the proper flow and precise opening pressures to meet the specific needs of an application. Zero leak options are available for applications in which eliminating any leakage is critical.

Over half of the products we offer are designed for the unique needs of a specific application. Pressure relief valves can be designed in custom envelopes and configurations with unique cracking pressures, flow rates, leakage specifications, materials, and more. Contact your local Lee Sales Engineer to discuss your specific needs.

For an unbiased look at relief valve configurations, critical performance characteristics, design challenges, trade-offs, and common failure modes, check out our eBook: An Engineer’s Guide to Selecting a Pressure Relief Valve.

Safety 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. We 100% test each component for crack, flow point and reseat pressure to ensure reliable operation.

These valves are available in a wide range of envelopes and cracking pressures for system pressures up to 5000 psi. Some models are available with integral safety screens for added protection from rogue debris and contamination.

Pressure Regulating Relief Valves

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 a wide range of diameters and cracking pressures.

Thermal Relief Valves

When a fluidic system is subject to a rapid temperature change, the thermal expansion of fluids may potentially cause damage within the system. Thermal relief valves are designed to relieve small volumes of fluid to protect against thermal expansion. Due to the small passage size of thermal relief valves, they include an integral CRES low micron filter upstream of the valve seat to prevent internal silting due to ingested contamination.

Zero Leak Relief Valves

Instead of relying on a metal-to-metal seal, these valves incorporate an elastomeric or polymeric seal for a zero-leak design, perfect for when eliminating leakage is a critical requirement of hydraulic or pneumatic applications.

Support & Resources

Support & Resources from a Team that Speaks Your Language

Partner with The Lee Company and get much more than just a supplier of top-quality fluid control products. Our reliable technical support team is available every step of the way to help you find solutions, maximize productivity, and drive efficiency across your operations. Check out these resources tailored to your industry to learn more.