根阀又叫表阀，英文root valve，常用阀门的一种。是用于管路测试，泄放作用的一种阀门，广泛运用于电力，化工石油等行业中。
根椐大型压缩机气阀阀片的失效形式，分析了气阀弹簧、压缩介质等因素对气阀寿命的影响。
The effects of the factors such as valve spring and compression agent on the service life of valves were analyzed based on the damage forms of valve sheets of large-scale compressors.
节能控制仪是一数码并内置有压差器的脉冲阀控制仪，最多能控制到204个脉冲阀，而这也只要用两根管子与RPB先导阀盒组串连起来就可以达到。
The Ecoserial device is a digital economiser with differential pressure gauge able to pilot until 204 valves by connecting itself to a pneumatic driving module RPB with only two threads.
现场试验表明，钻井阀开关灵活，密封可靠，提高了气体钻井时接单根的效率和作业的安全性，测斜时不碰、挂测斜仪。
The field test indicates that characterized by flexible switching and reliable sealing, the new drilling valve can improve the efficiency of connecting individual pipe whi…
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