Question about Air Tools & Compressors
Once the pop off valve reaches its opening point, it will stay open as long as the pressure is above that point. When you shut the compressor off, the pressure leaks down until the pop off valve closes. Sounds like the pressure regulator is set a little too high. If you can turn the regulator switch down, it should fix it.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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It could be that the input air filter is badly clogged. I might more likely be that the Non-return valve on the air tank input is not sealing properly and not allowing the tank to build up pressure. This valve is at the end of the main pipe runs between the compressor and tank. It could also mean (less likely) that the poppet valves inside the compressor cylinder head are not sealing properly. Other faults could be worn rings on the compressor pistons or a bad seal between the compressor cylinder head and block.
To check the Non return valve allow compressor to build up some pressure and then loosen union nut on Non return valve. There should be some air released at first but should stop if valve is ok. If leaking remove valve and check for dirt and clean. If valve still leaks replacement is the only fix.
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