Electronically controlled, directly actuated 3-way pressure regulating valve for gaseous and liquid media

摘要

The invention relates to a pressure regulating valve which is acted on by means of an actuating element, having a valve body which has connections, leading into an internal valve space, of a pressure supply chamber and of a pressure ventilating chamber. A pressure regulating chamber is provided between the pressure supply chamber and the pressure ventilating chamber. The connection between these is controlled by an annular sealing edge and a valve piston which interacts therewith. The connection between the pressure regulating chamber and the pressure ventilating chamber is controlled by a sealing edge and a valve piston interacting therewith. The valve pistons are displaceably seated on a control slide which can be displaced by the actuating element counter to spring action and has a thickened middle piece which, in the event of displacement in one direction, takes with it one valve piston and, in the event of displacement in the opposite direction, takes with it the other valve piston. A bellows is seated between the two valve pistons. At the other end, between each valve piston and the end of the valve body, there is likewise seated a bellows which in each case encloses a prestressed helical compression spring which is contained in the interior and is supported on one side on the valve piston and on the other side on the valve body.