启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。
Headstock piece on media flows and forces open or closed to prevent backflow valve media called a non-return valve.
球阀是带圆形孔的球体作启闭件， 球阀球体随阀杆转动， 针阀以实现启闭动作。
The valve's disc is ball with hole and driven by stem to open and close.
蝶阀是用圆形蝶板作启闭件并随阀杆转动来开启、关闭和调节流体通道的一种阀门。
Diefa is used to open and close a circular Tip plates and then Fagan moves to open, and closed a valve to regulate fluid passages.
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