Abstract: A pressure reducing valve, for a clamping device in particular, has a control plunger, which is acted upon by a regulating pressure against an adjustable force, and a closing body which is preloaded against a valve seat in the closing direction by the force of a compression spring. The closing body is movable from its closed position into its opened position, past the valve seat, via a transfer element, thereby allowing control of the flow of pressure medium from a pressure inlet to a regulating pressure outlet. The control plunger is designed as a hollow piston in order to accommodate the closing body, and it forms the valve seat for the closing body which is guided in the control plunger.

Abstract: A pilot-operated pressure shut-off valve having a main control piston which, when an upper system limit pressure in the hydraulic system is reached, connects an inlet, via which pressure medium can be fed to a hydraulic system, to an outlet by taking up a first switching position and, when a lower system limit pressure is reached, separates from the outlet by taking up a second switching position. The pressure shut-off valve has a pilot valve arrangement by which the fluidic connection of a control space adjacent to the main control piston can be changed in order to control the main control piston, and which has a valve housing, with a first pilot piston and a second pilot piston accommodated within the first pilot piston for compact construction and capability to adjust the two pilot pistons mechanically completely independently of each other.

Abstract: What is disclosed is a directly controlled pressure control valve comprising a seat piston in a longitudinal bore of a valve housing, which is radially guided in its guidance portion through the intermediary of two circular, spaced-apart guide members in the longitudinal bore.