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1- pressure setting spring 2 - actuator piston on the stem 3 - drop valve 4 - control channel 5 - check valve  

In order to recognize the causes of operational failures, you must first know the principle of operation of UNLOADER - see the adjacent entry: "How does the by-pass unloader work". In service practice, it often happens that a newly installed unloader does not "reflect" - it does not go into by-pass mode - the complete opening of the bypass, allowing the pressure on the pump to drop. Below are possible ...