ball-valve action 中文意思是什麼
ball-valve action
解釋
球瓣作用-
At this time, slowly open the test ball valve completely, then a lot of water is discharged at the drainage outlet, close the test ball valve, the drainage device closes too, this shows that action of anti - pollution isolating valve is normal
此時緩慢將試驗球閥完全打開,這時排污口有大量水排出,關閉試驗球閥,排污器也隨之關閉,這說明防污隔斷閥動作正常。
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