The amount of air pressure required to close the valve depends upon the line pressure of the pipeline.
关闭阀门所要求的气压值依赖于管道内的管道压力。
Open needle valve "b" to bleed air and then close "b" and vent needle valve.
开启针形阀“B”排放空气，然后关闭“B”和排气针形阀。
Air solenoid valves are used to open and close the valve.
采用航空电磁阀控制阀门开闭。
Based on solenoid valve design theory, by estimating the maximum air pressure and spring force, a direct operated solenoid valve is designed to control the open and close of the air chamber.
通过估算空气腔中的最大气体压力和回位弹簧的拉力，基于电磁阀设计基本原理，设计开发了一直动式电磁阀用于控制空气腔的开闭；
Based on solenoid valve design theory, by estimating the maximum air pressure and spring force, a direct operated solenoid valve is designed to control the open and close of the air chamber.
通过估算空气腔中的最大气体压力和回位弹簧的拉力，基于电磁阀设计基本原理，设计开发了一直动式电磁阀用于控制空气腔的开闭；
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