... normally closed valve 常闭阀 normally open valve 常开阀 nozzle control valve 喷嘴调节阀; 喷嘴阀; 喷嘴控制阀 ...
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常开阀运行试验的协助一项类似的原则，但与来自压力变化相反的效果。
Normally Open pilot assisted valves operate on a similar principle but with opposite effects from the pressure variations.
实现转向的液压系统由单向阀、常开电磁阀控制。
The hydrostatic system is controlled by the unilateral valves and electromagnetic valves.
在该系统中，针形阀i常闭，针形阀常开。
In this system, I often close the needle valve, needle valve is always open.
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