一、事 故 经 过 1983年8月28日17时28分,504厂空压站,5L—40/8型空压机一级安全阀动作,操作人员紧急停车,检查二级排气阀门（后止点）,发现二级排气阀门松动。更换二级排气阀门后,继续起动,一级安全阀仍动作,并伴有少量水,从气缸体和气缸座石棉垫连接处向外渗水,因而紧急停车。 First, the accident After August 28, 1983 at 17:28, 504 factory air compressor station, 5L-40/8 air compressor a safety valve action, the operator emergency stop, check the two exhaust valve (after the stop Point), found two exhaust valve is loose. After the replacement of the second exhaust valve, continue to start, a safety valve is still moving, accompanied by a small amount of water, from the cylinder block and cylinder block asbestos pad joints to seepage water, thus emergency stop.