... force, joint exhaust opening and closing, reach the purpose of automatic exhaust. When the gas is collected ... lower lever system, linkage, open the exhaust valve, gas leak, released the results due to the ... complete piping and equipment system of automatic exhaust process.2,constitution Brass valve,valve cap, ... diameter of pipe, simply adding 1/2 '' to 3/4 '' complement core . (3),If not exhaust,tighten ...