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阀前压力
[机] upstream pressure
- 运用正交试验设计方法在田间进行灌水试验，结果表明：波涌阀前调节阀入口压力是影响波涌阀阀片转换的主导因素；
The main factor was the entrance pressure of the regulating valve before surge valve to influence the conversion of valve slice of surge valve. - 在正常操作压力下用空气测试与过滤校准器（仪）前的隔断阀所有相连的仪表集气管及管道。
Test all instrument air headers and piping leads up to the block valve immediately preceding the filter regulator with air at normal operating pressure. - 止回阀是利用阀前阀后的压力差而自动启闭的阀门，它的作用是使介质只做一个方向的流动，而阻止其逆向流动。
Check Valve before the valve is to use the pressure after poor hoist the automatic valve, it is the role of the media flows only in one direction, reverse and stop its flow.
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