flapper valve
... 阀杆 valve spindle 搭钮阀;片状阀 flapper valve 卸荷式降低压力阀 排气管固定架 balanced reducing valve ...
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... 弹簧薄膜式降低压力阀 spring diaphragm reducing valve 蝶阀;瓣阀;敲门;搭钮阀 flap valve 配汽活塞阀缸套 piston valve line ...
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