| 摘要 |
A hydraulic control valve to control a double-acting working cylinder having a piston with a piston rod on one side, whereby the control valve formed in the structure to move the piston has at least four external connections, P, A, B, T and a device to feed the fluid forced out of the small stroke space into the large stroke space back while the piston rod is moving out, and further, for independent switching of the working cylinder from the work stroke to slow movement with a subsequent holding state to release pressure from the small stroke space of the working cylinder, a connection of the small stroke space to the tank can be switched on, is characterized in that on the control valve (20) having five control edges (recesses 32,33,34), two separate line paths (41,42) are formed to feed the fluid forced out of the small stroke space (14) of the working cylinder (10) back with a back-feed control edge (recess 33) and a pressure-release control edge (recess 34) is formed to release pressure from the small stroke space (14) to the tank (17). |
