Why does the pressure rise again after replacing the air valve in a piston compressor? ? ? ? ?
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Secondary piston-type nitrogen compressor: The outlet pressure at the first stage suddenly increased to 2.1 MPa (the normal pressure is 1.7 MPa), causing the safety valve to activate. The inlet pressure of the compressor was 0.7 MPa, while the outlet pressure was 3.2 MPA, both of which are within normal ranges. No blockages were found in the pipelines, and the gas valves were functioning properly. Yet, when the compressor was restarted, the pressure remained high and the safety valve activated again. Could anyone help analyze what could be the cause? After replacing the suction and exhaust valves in stage 2, the compressor operated normally. However, after 5 days of operation, the outlet pressure at stage 1 increased again to 1.9 MPa; the increase from 1.7 MPa to 1.9 MPa followed a pattern similar to that in the first instance. Was a piston inspection carried out this time?
What are the pressure and temperature levels when the entrances and exits at all levels are operating normally? What are the inlet and outlet temperature and pressure when a problem occurs?
After it worked normally after the replacement, the value rose again; when replacing the second-stage intake and exhaust valves, was anything else touched?