In the event that a boiler does shut down the stop - check must prevent backflow into the boiler , the weight of the disc and dash pot piston , through the force of gravity , promote rapid sealing so steam and condensate cannot backflow into the boiler even at low pressures 如果锅炉没有关闭截止止回阀，则必须防止回流到锅炉上，阀瓣压铁和缓冲活塞，在重力的作用下，能够迅速实现密封，使得蒸汽和冷凝水即使在低压下也不会回流到锅炉里。
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