... valve numbering guide；气门编号指导 valve open position；气门开启位置 valve opening；气门开度，阀的开启 ...
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The disc and associated moving parts may be in a constant state of movement if the velocity pressure is not sufficient to hold the valve in a wide open and stable position.
如果流体流速压力无法将阀门支撑在一个较大的开启度并保持在稳定的开启位置，则阀瓣和相关的运动部件可能会处于一种持续振动的状态。
Lock the exhaust valve in its open position.
把排气阀固定在它开启的位置。
The hand wheel is always in the same position relative to the valve body regardless of whether the valve is in the open or closed position.
不管阀门是在开启或是关闭位置，手轮总是处在相对于阀体的同样的位置。
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