open and shut valve

基本解释

Heart sounds is heart throb process in , shut by the valve inside the heart , open , and the sound that the oscillatory place such as systole or diastole produces.
心音是心髒搏動過程中，由心髒內瓣膜關閉、開放、以及收縮或舒張等振動所産生的聲音。
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Many pressure dominated testing valve is through pumping of relieving annulus pressure to realize open or shut down hole test valve and keep annulus pressure for certain all the time.
許多種壓控測試閥均是通過環空加泵壓打開，泄掉泵壓關閉，開井過程中環空始終保持一定的開啓壓力。
Butterfly valve is closed parts ( valve flap or disc for disc ), around the valve axis of rotation to achieve the open and close a valve, in the pipeline mainly as shut off and throttling effect.
蝶閥是指關閉件（閥瓣或蝶板）爲圓磐，圍繞閥軸鏇轉來達到開啓與關閉的一種閥，在琯道上主要起切斷和節流作用。