Valve for providing a fluid-conducting connection between a pressure supply port and a consumer port or between the consumer port and a return port

A valve, having a valve housing and a valve piston;

• wherein
• the valve piston is arranged in the valve housing so as to be longitudinally movable;
• wherein
• the valve piston can be actuated by an actuating solenoid to produce either a fluid-conducting connection between a pressure supply port and a consumer port or between the consumer port and a return port in the valve housing;
• wherein
• the valve piston is permanently connected to the return port at opposing end faces in a fluid-conducting manner;
• wherein the valve piston has a pressure-active measuring surface in the region of the consumer port;
• the pressure-active measuring surface provides the respective fluid pressure at the consumer port as a counterforce to the actuating force of the actuating solenoid when the actuating solenoid is energised in order to produce a fluid-conducting connection between the pressure supply port and the consumer port;
• the consumer port consists of a plurality of rows of drilled holes arranged one behind the other when viewed in the direction of travel of the valve piston;
• one row of drilled holes serves to establish the fluid-conducting connection between the pressure supply port and the consumer port and a second row of drilled holes serves to transfer the pressure from the consumer port to the measuring surface of the valve piston;
• and wherein
• at least when the actuating solenoid is de-energised, the valve piston assumes a position, providing that the two rows of drilled holes are in communication with each other in a fluid-conducting manner via a recess in the valve piston, the recess forming the measuring surface, and a third row of drilled holes is separated from the two rows of drilled holes by the valve piston in the valve housing.

A valve, having a valve housing and a valve piston;

• wherein
• the valve piston is arranged in the valve housing so as to be longitudinally movable;
• wherein
• the valve piston can be actuated by an actuating solenoid to produce either a fluid-conducting connection between a pressure supply port and a consumer port or between the consumer port and a return port in the valve housing;
• the valve piston is permanently connected to the return port at opposing end faces in a fluid-conducting manner;
• wherein the valve piston has a pressure-active measuring surface in the region of the consumer port;
• the pressure-active measuring surface provides the respective fluid pressure at the consumer port as a counterforce to the actuating force of the actuating solenoid when the actuating solenoid is energised in order to produce a fluid-conducting connection between the pressure supply port and the consumer port;
• and wherein
• the valve piston is configured in a stepped manner on a side directed towards the return port, with a first step comprising the measuring surface and with a second step merging into the first step, formed by a recess, a largest external diameter of the second step corresponding to an internal diameter of a separating wall and to an internal diameter of the valve housing at the location of the return port.