Multiway valve with piston slide valve

Abstract

A multiway valve, which includes a piston slide valve and at least five control chambers, of which a middle chamber comprises an intake chamber for a pressure medium, chambers adjacent the middle chamber are connected to actuators, and chambers outside the adjacent chambers are connected to a reservoir at a preset pressure level wherein, in the area of piston guide gaps formed between the intake chamber and actuator chambers, a first annular space is provided, which in a middle position of the position slide valve, in which an intake of the pressure medium source and connections of the actuators are closed, is connected by ducts in the piston slide valve to a reduced pressure level source. In order to keep flow medium from being able to penetrate from the reservoir into one of the actuator chambers in the area of the piston guide gaps between the actuator chamber and the intake chamber, a second annular space is provided, which by means of a radial duct provided in the piston slide valve leads into a piston slide valve recess from which the radial duct of an adjacent annular space originates and which, only in the middle position of the piston slide valve, is connected by a duct guide provided in the valve piston to a common valve space connected to an overflow oil line, the common valve space being located laterally beside the chambers and the flow paths within the piston slide valve between the chambers and the piston slide valve recesses being separated from one another over the entire length thereof.