Relief VALVES ENGINEERED TO PERFORM UNDER PRESSURE
Count on proven performance to protect your pneumatic, hydraulic, and high pressure systems. Our pressure relief valves are trusted worldwide for superior quality, reliability, and performance - from outer space to deep underground.
Built to Guarantee your product is SAFE and reliable
Our pressure relief valves are compact, durable, and built to handle diverse system demands. Each valve is rigorously tested to ensure safety, reliability, and efficiency throughout its lifecycle. They are available in various sizes and configurations, including zero-leak options for applications in which eliminating any leakage is critical. Explore our products below to find the best solution for you.
Safety Relief Valves
Designed to be fast-acting, these relief valves protect your systems from sudden pressure spikes. They come in low-leak and tight hysteresis options and undergo thorough testing for crack, flow, and reseat pressures.
Pressure Regulating Relief Valves
These valves ensure stability across the operating range and are available in various 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.
High Pressure Safety Relief Valves
Built to handle severe operating pressures up to 5000 psi, preventing instability and damage. Available in various cracking pressures. The Hi-Q PRV is a line-removable unit designed for high-pressure, high-flow applications. It relieves up to 5400 psid and 19+ GPM, with a side inlet to minimize size and weight.
High Flow Pressure Relief Valves
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). This 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.
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.
NACE Compliant Relief Valves
The Lee Company’s NACE Compliant Relief Valves provide reliable protection in corrosive environments, meeting NACE MR0175/ISO 15156 standards for the oil and gas industry. Built from corrosion-resistant materials, these compact valves perform optimally under high pressures, safeguarding system integrity and minimizing the need for maintenance in harsh conditions.
Insert Style Pressure Relief Valves
Lee insert style pressure relief valves offer secure, threadless installation with integral locking, eliminating leakage. Available in ball and poppet styles, they ensure fast response, stable flow, and high cracking pressures up to 220 bar.
Press In Style Pressure Relief Valves
Lee press in style pressure relief valves feature a barbed design for secure installation in plastic housings, preventing leakage. Available in sizes from 2.5 mm to 8 mm, they ensure low leakage, repeatable cracking, and compatibility with various fluids, including medical grade applications.
EXPLORE OUR FULL RANGE OF PRESSURE RELIEF VALVES
Supporting hydraulic and pneumatic systems, including compact installations, our pressure relief valves meet a wide range of needs with an unwavering commitment to safety, precision, and durability. Discover the right valve to ensure reliable, leak-free performance in even the most demanding settings.
Safety Relief Valves
Designed to be fast-acting, these relief valves protect your systems from sudden pressure spikes. They come in low-leak and tight hysteresis options and undergo thorough testing for crack, flow, and reseat pressures.
Pressure Regulating Relief Valves
These valves ensure stability across the operating range and are available in various diameters and cracking pressures.
THERMAL RELIEF VALVES
Thermal relief valves protect fluidic systems from damage caused by thermal expansion by releasing small fluid volumes during rapid temperature changes.
High Pressure Safety Relief Valves
Built to handle severe operating pressures up to 5000 psi, preventing instability and damage. Available in various cracking pressures. The Hi-Q PRV is a line-removable unit designed for high-pressure, high-flow applications. It relieves up to 5400 psid and 19+ GPM, with a side inlet to minimize size and weight.
High Flow Pressure Relief Valves
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). This 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.
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.
NACE Compliant Relief Valves
The 0.281-inch NACE Compliant PRI® valve is built for harsh environments, using corrosion-resistant materials per NACE MR0175/ISO 15156. Available for pressures up to 3000 psi (screened/unscreened) and 5000 psi (screened).
Insert Style Pressure Relief Valves
Lee insert-style pressure relief valves offer secure, threadless installation with integral locking, eliminating leakage. Available in ball and poppet styles, they ensure fast response, stable flow, and high cracking pressures up to 220 bar.
Press-In Style Pressure Relief Valves
Lee press-in-style pressure relief valves feature a barbed design for secure installation in plastic housings, preventing leakage. Available in sizes from 2.5 mm to 8 mm, they ensure low leakage, repeatable cracking, and compatibility with various fluids, including medical-grade applications.
expert tips and guidance written for engineers, by engineers.
This is the ultimate resource for engineers designing fluidic systems that require reliable pressure regulation or protection against surges.
Download your free copy now to discover:
- The basics of pressure relief valves and their operation
- Key functions and configuration options
- Essential performance characteristics for optimal design
- Environmental factors influencing valve design
- Performance trade-offs and design challenges
- Common failure modes and how to avoid them
