Pressure relief valves for air compressor systems are simple, spring-loaded mechanisms. When the inlet pressure force exceeds the spring load, the safety valve opens proportionally to the pressure increase, allowing air to "leak out" as needed.
Direct-acting pressure relief valves for compressed air applications respond automatically if the pressure becomes too high. If the system pressure is too high, a disc seal is pushed up against a spring, which keeps the valve closed. If the compressed air force exceeds the spring's force, the valve disc is lifted off the valve seat, and the compressed air is discharged to the atmosphere.
According to the ASME relief valve standard, the full discharge capacity of the valve is typically achieved when the system pressure rises to no more than 10% above the valve's set pressure. If the system pressure falls below the set pressure value, which is usually set at 90%, the system must be completely shut down.
A set pressure function test should be performed at least once a year to ensure pressure relief valves maintain their effectiveness over time. All Air Compressors recommends inspecting pressure relief valves for signs of corrosion or loss of functionality once a year.
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source: vmacair
