A proportional valve actuated electromagnetically and in a pilot-operated manner having a valve slide unit mounted in a valve housing so as to be movable along an axial direction, the valve slide unit being drivable by an electromagnetic actuator assembly provided axially at one end for the pilot-operated opening of a usage fluid inlet and/or outlet of the valve housing in response to an energization of stationary coil means of the actuator assembly and interacting with mechanical force storage means (48, 50), in particular being held in a currentless stable axial position in the valve housing by said force storage means (48, 50), wherein the valve slide unit which has a closure section which extends in the radial direction from a body section of the valve slide unit for sealing interaction with the usage fluid inlet or outlet realized on an inner wall of the housing on the shell side interacts with a guide section of the valve housing via the preferably cylindrical and/or coaxially extending body section axially at one end in order to realize an axial sliding bearing and is mounted at the other end of the body section by an axial bearing having radial play due to its resting thereon, wherein preferably ring-shaped sealing means seal a shell section of the body section with radial play relative to the inner wall of the valve housing on the shell side, characterized in that the guide section of the valve housing is a stationary guide section and in that the axial bearing having radial play has a bearing bush engaging the end of the body section, preferably in the radial direction and/or on the outside, wherein the bearing bush is mounted with a radial play with respect to the stationary guide section. the valve slide unit being drivable by an electromagnetic actuator assembly provided axially at one end for the pilot-operated opening of a usage fluid inlet and/or outlet of the valve housing in response to an energization of stationary coil means of the actuator assembly and interacting with mechanical force storage means (48, 50), in particular being held in a currentless stable axial position in the valve housing by said force storage means (48, 50), wherein the valve slide unit which has a closure section which extends in the radial direction from a body section of the valve slide unit for sealing interaction with the usage fluid inlet or outlet realized on an inner wall of the housing on the shell side interacts with a guide section of the valve housing via the preferably cylindrical and/or coaxially extending body section axially at one end in order to realize an axial sliding bearing and is mounted at the other end of the body section by an axial bearing having radial play due to its resting thereon, wherein preferably ring-shaped sealing means seal a shell section of the body section with radial play relative to the inner wall of the valve housing on the shell side, characterized in that the guide section of the valve housing is a stationary guide section and in that the axial bearing having radial play has a bearing bush engaging the end of the body section, preferably in the radial direction and/or on the outside, wherein the bearing bush is mounted with a radial play with respect to the stationary guide section.