Finally, Dad turned off the stove, the pot began to cool and the pressure reliefvalve sprayed out a cloud of steam.
最后，爸爸关上了炉子，锅开始降温，然后解压阀喷出了一股水汽。
2
3 SEC The PORV (pressure reliefvalve) opens automatically, releasing steam into a holding tank.
3秒减压阀自动打开，将蒸汽释入一个储存罐。
3
Unique, modulating action pilot operated reliefvalve with soft seats having the ability to handle hot water, steam, hot hydrocarbon vapors or liquids, using inert plastic soft goods.