When you need to protect your system or its components from sudden pressure increases, you want fast-acting, reliable valves that will perform even after a long period of inactivity. After relieving pressure, the valve must close quickly so the system can continue to perform. It is critical that a safety relief valve is stable, minimizes leakage, and opens and resets at the necessary pressures. All Lee valves are 100% tested to ensure consistent, long term performance.

View our line of pressure relief valves for a wide range of industries that require hydraulic or pneumatic safety relief, such as aerospace, oil and gas, automotive, industrial, and medical.

Thermal relief valves protect your systems against the thermal expansion of system fluids resulting from temperature increases. The thermal expansion may result in increased pressure that creates stress or damage to your housing or components. This is a common issue in applications where temperatures rise quickly, such as an airplane going from cold temperatures at altitude and descending to the heat of a runway during summer.

Your valve must operate with very low flow rates without silting or causing instability. A valve with low hysteresis helps ensure only the necessary volume of fluid is removed from the system. You also need tight leakage due to the infrequent use of thermal relief valves.

See our line of thermal relief valves.