Adjustable Pressure Relief


Vacuum systems are only designed to operate under external (atmospheric) pressure. Adjustable pressure relief valves (PRV’s)offer a means of protecting vacuum vessels against internal over-pressurization. There are many scenarios in which rapid pressure buildup inside a vacuum vessel may occur, such as a runaway gas back-fill operation. In addition to protecting delicate instruments and equipment, a pressure relief valve also minimizes risk of injury to system operators and other lab personnel.

How do they work?

Pressure build-up inside a vacuum vessel pushes on a spring loaded, elastomer sealed, piston. Once the pressure relief valve’s calibrated pressure limit is reached, the piston is displaced breaking (disengaging) its seal and providing instant pressure relief in the vessel. Unlike single use ‘burst disc’ devices, a pressure relief valve’s unique design allows it to be used over and over.

For systems operating at high vacuum pressure regimes, pressure relief valves (PRV’s) are the economical alternative to single-use burst disc products. Standard pressure relief valves are factory-calibrated for a 2 PSI relief pressure, however, our PRV’s can be adjusted to as low as 0.5 PSI relief pressure, if required for your application.

• Ideal for protection against system over pressure.
• Viton® sealed.
• Adjustable pressure settings.
• Other configurations available on request.


Material  :  St.St. & viton®

Temperature range : -20 to 150°C (200°C*)

Vacuum range  :  Atm to 1×10-8 mbar


* – Increased limit for intermittant use.