The function of bypass pipe
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Pumps and compressors generally have bypass pipes. What is its function? Is there a specified direction for the liquid in the bypass pipe?
The function of bypass pipe: 1. Diversion. Such as pump return pipe ； 2. Temporary replacement, such as the bypass pipe of an automatic regulating valve, which temporarily ensures non-intermittent flow of fluid during maintenance of the automatic valve.
There is another function: The bypass pipe needs to be opened when starting the positive displacement pump.
Generally, a pump does not need a bypass pipe. At most, a return pipe is added to the outlet. However, a positive displacement pump requires a bypass pipe. The compressor must have a bypass. The bypass of the compressor is used to adjust the flow or reduce the load. However, the bypass of the compressor cannot be opened for a long time, otherwise it will be detrimental to the compressor.
What is the function of volumetric pump bypass? Is it enough to just have an outlet safety valve?