[113] 4/3-way valve with pump bypass (4)
The circuit shows the
4/3-way valve in functional representation as a final control
element of a double acting cylinder. The valve is in its
mid-position; the pump delivery flows via the by-pass line within
the pilot piston to the tank.
The non-return valve protects the pump in cases where the piston rod of the cylinder is subject to an external load.