[111] 4/3-way valve with pump bypass (2)
The 4/3-way valve is in its
mid-position; there is flow from P to T, while A and B are
closed. Since the output from the pump flows to the tank, this
switching position is called pump bypass or also pump
recirculation.
In the case of pump bypass, the pump needs to operate only against the resistance of the valve, which has a favorable effect on the power balance.