The traditional method to adjust the valve opening and to turn on or turn off the pump engine by people to meet the need of water supply was improved.
提出了变频自动控制在节水灌溉中的应用方案，改变了传统的调整阀门开度及人工启停电机来满足供水需要的操作方法。
The gate valve usually is at the off-position, the water pump starts when the gate valve opens slowly, when water pump engine off, the gate valve shuts down slowly first.
闸阀平时是处于关闭状态，水泵启动时闸阀慢慢打开，水泵停机时，闸阀先慢慢关闭。
In the course of transmission, mud pulse signal mainly disturbed by drilling pump, engine in the bottom hole, air bladder contained in mud and movement of drilling equipment.
泥浆脉冲信号在传输过程中主要受钻探泵、井底动力机、泥浆中的气泡及活动钻具的干扰；
The present invention relates to a combination of a chamber and a piston, and a pump, engine, oscillation absorber and a converter containing such combination.
本发明涉及一种活塞和腔室的组合以及包括该组合的泵、吸震器及促 动器。
The present invention relates to a combination of a chamber and a piston, and a pump, engine, oscillation absorber and a converter containing such combination.
本发明涉及一种活塞和腔室的组合以及包括该组合的泵、吸震器及促 动器。
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