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The regulator regulates the inlet pressure to a desired outlet pressure and relies on the energy of the medium itself to maintain the outlet pressure automatically. If the valve is not decompression or decompression failure and through, then it may be for one of the following reasons: 1 main valve or pay valve sealing surface dirt; 2 main valve or pay valve sealing surface damage; 3 main , Pay the valve spring fatigue or broken; 4 feedback channel 3 hole is blocked; 5 diaphragm fatigue or damage; 6 piston cylinder wear or corrosion; 7 piston ring groove and piston ring stuck; 8 valve body cavity is full of condensate.