美国进口膜盒式蒸汽疏水阀的主要动作元件是金属膜盒，内充一种气化温度比水的饱和温度低的液体。
The main acting unit of bellows trap is metal bellows, which is filled with a type of liquid with gasification temperature lower than water's saturation temperature.
膜盒式蒸汽疏水阀的反应非常灵敏，工作时阀前存有高温凝结水，无蒸汽泄漏，节能效果显著。
As they are sensitive with high-temperature condensate deposits in front of valves while operating, they boast of remarkable energy-saving effect with no steam leakage.
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