"The mechanical noise emitted by the pilot-type overflow valve, generally from the impact of the part and the part generated by the part caused by the processing error.

In the noise emitted by the pilot type overflow valve, there is sometimes mechanically high-frequency vibration, which is generally called self-excited vibration. This is the sound of the main valve and the guide valve due to high frequency vibration. Its incidence is related to the configuration, flow, pressure, oil temperature (viscosity) of the oil return pipeline. Under normal circumstances, the pipeline diameter is small, small flow, high pressure, low oil viscosity, and high self-excited vibration. "

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