Valve arrangement for control of pressure activation of double-acting adjustment cylinder as drive for particularly hydraulically operable shears functioning at different speeds

摘要

The valve arrangement is for control of pressure activation of a double-acting cylinder as the drive for particularly a hydraulically operable shears, functioning at different speeds. It involves a main valve (14) with two first connections (BS, AS), which selectively via a control valve are connectable with a hydraulic pump or a tank. A third connection (AZ) is permanently connected with the piston connecting rod side of the adjustment cylinder (10) and a first connection (BS) is permanently connected with the piston base side of the adjustment cylinder.