Stroke the valve open and closed several times, with no line pressure.
在没有任何管道压力状态下开启和关闭阀门几次。
The cycle of operation of the four-stoke engine begins with the piston at TDC and the intake valve open.
四冲程发动机的工作循环是以活塞在上止点、进气门打开为开始的。
Input signal of controller is solenoid valve lift. Control parameters are valve opening timing and valve open duration.
控制器的输入信号为电磁阀升程，控制量是气门开启定时和开启持续时间。
The result shows that in big pressure ratio and valve open conditions, gas fluctuation in valve seat throat is small and flow is steady.
在大压比、大升程条件下，喉部各测点的脉动压力不大，流动稳定。
The flowing stream divides into two approximately equal parts; half the flow tends to force the valve open while the other half tends to force it closed.
液流分成近似相等的两部分，一半流体的压力使阀门开启，而另一半流体使阀门关闭。
The intake stroke starts with the pistonat the top of the cylinder (intake valve open and exhaust valve closed) and stops with the pistonat the bottom of its travel.
进气冲程在活塞位与气缸顶部（进气门开启，排气门关闭）时开始，在活塞到达其行程的底部时结束。
Before proceeding with the installation, close the main water supply valve, open a water faucet to relieve the house pressure and then close the faucet.
在安装热水器之前，关闭主供水阀门，打开水龙头将住宅内的水压释放掉，然后关闭水龙头。
Before proceeding with the installation, close the main water supply valve, open a water faucet to relieve the house pressure and then close the faucet.
在安装热水器之前，关闭主供水阀门，打开水龙头将住宅内的水压释放掉，然后关闭水龙头。
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