PRESSURE-REDUCING SEAT VALVE AND LOCKING CIRCUIT

摘要

The invention provides a pressure reducing seat valve and locking circuits. A pressure means may be supplied to a supply connection at a predetermined pressure by means of the pressure reducing valve in a seat valve configuration. The pressure reducing valve has a valve piston being movable opposite a seat surface that is disposed on a housing in a fixed manner, and which has a first control surface at which said valve piston is forced by the pressure in the supply connection in the sense of a locking movement against the seat surface, said valve piston being forced by way of a control spring in the sense of an opening movement, wherein the valve piston is forced in the sense of a locking movement by way of a second control surface subjected to the pressure in the supply connection. The pressure reducing function and a check valve may be integrated into such a seat valve for a pre-opening of the pressure means connection between the secondary pressure and the primary pressure. A locking circuit according to the invention having such pressure reducing valves and a directional seat valve enables the minimizing of the hydraulic power loss, and the reducing of the effort for changeable locking pressures.