A small valve or faucet used to drain or reduce pressure, as from a boiler.
泄气阀，小龙头用来排空或降低压力的一种小阀门或小龙头，如锅炉上的。
Boiler pressure is higher than rated pressure to release energy, the valve can not be a timely pop-up, the boiler unexpected serious incidents occur.
锅炉内压力高于额定压力需要释放能量时，安全阀不能及时弹起，锅炉就会发生意想不到的严重事故。
Boiler is a special pressure equipment which may lead to explosion and also discharges a large amount of smoke, dust and harmful gases.
锅炉是有爆炸危险的特种承压设备，又是耗能与排放烟尘及有害气体的大户。
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