The pump sucks oil from the oil tank, and then supplies the pressure components for use. The pressure components drain the oil back to the mailbox according to the conditions. This is the basic hydraulic circuit. Simply put, the pump itself does not return oil! It is complicated to say that some pumps have the function of pressure maintenance. When the pressure at the oil outlet increases to a certain limit, the pressure reaction returns to the pump to change the swash plate angle of the plunger pump. The eccentricity of the vane pump changes and finally reaches the pump no longer output. Pressure, this pressure maintenance process generally requires oil return, but the pump without such maintenance will be connected to an overflow valve outside to avoid excessive pressure and stop pressure relief and return.
Post time: Oct-22-2020