self-acting valve [机] 自动阀 ; 自动活门 ; 自动阀门
direct-acting valve 直动阀 ; 正向控制阀
direct acting valve 直接操纵阀 ; 正向温控阀
straight-through fast acting valve 直通快动阀
quick-acting valve 快动作启闭阀 ; 速动阀
fast-acting valve 快速作用阀
reverse-acting valve [机] 反作用阀
Shipbuilding . head of sounding pipes with self - acting valve . details of body.
造船工业。带自动阀的测深管测头。阀体详图。
The design incorporates a channel thin enough to become entirely devoid of carriers (ie, free electrons or holes) when switched off, thus acting as a valve, yet full of them when switched on.
这一设计包含了一条足够细的隧道，当它关闭时，里面完全没有载流子(电子或空穴)，当它打开时，里面便充满了载流子，起到了阀门的作用。
Any leak or failure results in loss of control line pressure, acting to close the safety valve and render the well safe.
任何的渗漏或损坏都将造成控制管线压力的损失，这时关闭安全阀并确保井的安全。
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