Patent ID: 7788918

Claim:
A hydraulic circuit for actuation of a hydraulic working cylinder having a one-sided piston rod, comprising a reversible pump having two sides, whereby each side of said pump is selectively connected by a first two-way valve and a supply line to a tank containing hydraulic medium; whereby each side of said pump is connected through respective releasable control check valves to respective working chambers of the working cylinder; whereby each working chamber is connected to a respective discharge line having a respective hydraulic closeable valve, and to a respective replenishing suction line having a respective suction valve; wherein opposite ends of the discharge lines and/or replenishing suction line, opposite the respective ends connected to the respective working chambers, are connected together, and connected to the tank through an arrangement; wherein the arrangement includes a check valve blocking in the direction of the tank and well as a pressurizing valve opening in the direction of the tank; and whereby each of said hydraulic closeable valves is controlled by the pump through a second two-way valve.