Hydraulic control device for defined control of e.g. engine

摘要

With closed control nozzles (13) on the basis of the diaphragm in the valve bodies (2-5), the pressure out of the connecting conduits (A, B, P) builds up in the corresponding control chambers (15). In a preferred form of each valve piston (7), there is a difference between the piston surface and the seat surface of approximately 10 per cent. The pilot valve (11) is provided with four path-proportionally opening control nozzles (13) and an overflow opening to the outflow conduit. In the "O" position of the control component all four control nozzles are closed and corresponding to the displacement direction and dependent upon the displacement path of the control component, the two control nozzles provided for the corresponding displacement direction and together with the connected control conduits are opened and closed with synchronous cross-section, with the pressure in the control chambers altering dependent upon the displacement path.