当阀片两侧的压差随时间变化时，阀片的启闭与压差的变化之间存在一定的相位差，有可能引起泄漏甚至反向流动。
When the pressure difference changes with time, a phase shift will occur between the transient pressure difference and displace of valve flap, which could cause leakage and even reverse flow.
如果信号的相位有差别就会输出一个DC(直流)电压，这个电压正比于两个输入间的相位差。
If the signals are out-of-phase the output will be a DC voltage that is proportional to the phase difference between the two inputs.
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