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Vacuum systems are only designed to operate under external (atmospheric) pressure. Accu-Glass’ vacuum Pressure Relief Valve (PRV) offers 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. Besides protecting delicate instruments and equipment, a vacuum relief valve also minimizes risk of injury to system operators and other lab personnel.

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

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Pressure buildup inside a vacuum vessel pushes on a spring loaded, elastomer sealed, piston. Once the pressure vacuum 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.

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