signal pipe line 信号管道装置
train signal pipe 列车信号管
lineoutofservice signal pipe 管道钢管
signal pipe cut-out cock 信号风管遮断塞门
Oil pipe pressure signal 管路压力讯号装置
In the pipe system, the main function of the valve actuator to receive control signal.
在管道系统中主要起调节作用，阀门执行机构接收到控制信号。
It can change the flow and cut off gas medium in the pipe by the different control signal.
对管道中气体介质按不同控制信号调节流量大小和切断。
The buried pipe transfer equation, the frequency character and the attenuation equation of the leak signal are studied.
研究了埋地管道泄漏信号波的传播方程，泄漏信号频率特性以及衰减方程。
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