Abstract: An electromagnetic valve for an anode supply of a fuel cell system, the electromagnetic valve configured as a purge or drain valve including an actuator including a magnet coil configured to electromagnetically actuate an armature, and a valve plunger operatively connected with the armature; a valve seat openable and closable as a function of an actuation of the valve plunger so that a media connection between an inlet and an outlet is controlled through a valve chamber, wherein the valve seat and the inlet are configured at a connection spout connected with the actuator, and wherein an additional magnet coil is provided as a heating coil.

Abstract: A piston for an electromagnetically actuatable hydraulic valve wherein the piston is configured cylindrical and axially movable along a central opening that extends along a longitudinal axis of a housing of the electromagnetically actuatable hydraulic valve, wherein plural connections of the housing are opened or closed according to a position of the piston wherein the plural connections are flow connected with the central opening, wherein the hydraulic valve is hydraulically actuatable by a signal element, wherein a damping system is provided for reducing oscillations of a signal pressure of the signal element that impacts the piston, and wherein the damping system is configured in the piston that includes a receiving cavity for receiving the damping system.

Abstract: A hydraulic solenoid valve including a first port, a second port, a third port, a housing having at least one land between the first port and the second port, the at least one land including at least one balancing groove, and a spool that moves within the housing. The first port has a pressure higher pressure than a pressure of the second port, and the at least one centering groove is in communication with the third port. A flow of hydraulic fluid from the first port to the third port helps remove contamination from the at least one balancing groove and/or a flow of hydraulic fluid from the third port to the second port helps remove contamination from the at least one balancing groove.

Abstract: A hydraulic solenoid valve including a first port, a second port, a third port, a housing having at least one land between the first port and the second port, the at least one land including at least one balancing groove, and a spool that moves within the housing. The first port has a pressure higher pressure than a pressure of the second port, and the at least one centering groove is in communication with the third port. A flow of hydraulic fluid from the first port to the third port helps remove contamination from the at least one balancing groove and/or a flow of hydraulic fluid from the third port to the second port helps remove contamination from the at least one balancing groove.

Abstract: A piston for an electromagnetically actuatable hydraulic valve wherein the piston is configured cylindrical and axially movable along a central opening that extends along a longitudinal axis of a housing of the electromagnetically actuatable hydraulic valve, wherein plural connections of the housing are opened or closed according to a position of the piston wherein the plural connections are flow connected with the central opening, wherein the hydraulic valve is hydraulically actuatable by a signal element, wherein a damping system is provided for reducing oscillations of a signal pressure of the signal element that impacts the piston, and wherein the damping system is configured in the piston that includes a receiving cavity for receiving the damping system.