... closed center valve 中间位置封闭的阀(方向阀); 闭中心阀 hand-operated valves 手动阀 back-up valve 列车后端制动阀 ...
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The two ends of the two electromagnetic valves are respectively cross-connected to two hand-operated valves.
在两个电磁阀的两端分别跨接两个手动阀。
There are different kinds of valves ranging from simple hand operated valve to fully automatic valve for control of gas-air mixture.
有很多从简单的手阀等各种阀到全自动控制天然气混空气阀。
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