Patent ID: 8844436
Filing Date: 2014-09-30
Classification: B21D,B21J,B25B,B25F

Abstract:
1. A hydraulic press unit comprising: a fixed part; a movable part movable relative to said fixed part; a hydraulic piston causing said movable part to move relative to said fixed part; a return spring for moving said movable part to a starting position by a return movement; a return valve capable of moving between an open state and a closed state, said return movement being actuatable as a function of a predetermined applied pressure by activation of said return valve; a control valve capable of moving between an open state and a closed state, said control valve which, in addition to the return valve, opens a hydraulic-medium outlet when in its open state, said control valve having a hydraulic-medium inflow side and a hydraulic-medium outflow side; wherein when the return valve opens, the control valve is acted on by the pressure of the returning hydraulic medium on the inflow and outflow sides, the pressure being lower on the inflow side due to throttling.