... 螺纹活管套节 screwed union 螺旋提升阀 screw-lift valve 轴流风机，螺桨式风机 screw-type ventilator ...
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screw lift valve 螺旋提升阀
inside screw lift check valve 内螺纹升降式止回阀
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Unscrew the Allen screw in the middle of valve cap and lift up the cap just enough to pick up the old diaphragm.
旋松阀帽中间的内六角螺丝，并且提起阀帽，正好足够拿走旧阀膜。
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