An electropneumatic solenoid valve for a pneumatically actuated field device of a processing plant, such as a chemical plant, a petrochemical plant, a foodstuff processing plant, such as a brewery, a nuclear power plant or the like, comprising: - an air supply channel, an air dispensing channel and an air exhaust channel, wherein the air channels (11, 13, 15) mound into an air chamber; - a flapper valve member, comprising a magnetizeable flapper plate having at least one closure side arranged facing at least one air channel (13, 15) to be closed or to be released; and - an electromagnetic control device which deplaces the flapper valve member in an axial control direction for ventilating or exhausting the air dispensing channel, wherein the flapper plate being engageable with an axial contact wall of the air chamber to be magnetized by an electromagnetic control device of the solenoid valve; - a biasing means, such as a spring, forcing the flapper valve member into a closed position for closing one of the air channels (13, 15), such as the air supply channel, wherein the flapper valve member comprises a closure element being engageable with a delimitation interior wall mouth of a delimitation inner wall of this air channel (13, 15) such that the flapper valve member is arranged with a circumferential axial distance to the delimitation interior wall, wherein the flapper valve member is float-mounted unguided except for the biasing means within the air chamber, characterized in that the at least one closure side is at least surface-sectionally formed with a non-magnetizeable cover material, such as a cover layer, preferably a Teflon layer, or in that the flapper plate 25 is realized by a non-metallic material, such as a polymer material or plastic material, which is provided with metallic particles for receiving attraction forces, and in that the air chamber is radially delimited by a chamber interior wall, wherein a circular flapper plate is float-mounted axially moveable within the air chamber, wherein a maximal axial amplitude of movement of the flapper valve member in the axial control direction is at most one quarter in particular to one tenth of the axial thickness of the flapper plate, wherein the thickness of the flapper plate lies between 0.6 mm and 1 mm and/or wherein a maximal stroke is 0.1 mm to 0.3 mm. - an air supply channel, an air dispensing channel and an air exhaust channel, wherein the air channels (11, 13, 15) mound into an air chamber; - a flapper valve member, comprising a magnetizeable flapper plate having at least one closure side arranged facing at least one air channel (13, 15) to be closed or to be released; and - an electromagnetic control device which deplaces the flapper valve member in an axial control direction for ventilating or exhausting the air dispensing channel, wherein the flapper plate being engageable with an axial contact wall of the air chamber to be magnetized by an electromagnetic control device of the solenoid valve; - a biasing means, such as a spring, forcing the flapper valve member into a closed position for closing one of the air channels (13, 15), such as the air supply channel, wherein the flapper valve member comprises a closure element being engageable with a delimitation interior wall mouth of a delimitation inner wall of this air channel (13, 15) such that the flapper valve member is arranged with a circumferential axial distance to the delimitation interior wall, wherein the flapper valve member is float-mounted unguided except for the biasing means within the air chamber, characterized in that the at least one closure side is at least surface-sectionally formed with a non-magnetizeable cover material, such as a cover layer, preferably a Teflon layer, or in that the flapper plate 25 is realized by a non-metallic material, such as a polymer material or plastic material, which is provided with metallic particles for receiving attraction forces, and in that the air chamber is radially delimited by a chamber interior wall, wherein a circular flapper plate is float-mounted axially moveable within the air chamber, wherein a maximal axial amplitude of movement of the flapper valve member in the axial control direction is at most one quarter in particular to one tenth of the axial thickness of the flapper plate, wherein the thickness of the flapper plate lies between 0.6 mm and 1 mm and/or wherein a maximal stroke is 0.1 mm to 0.3 mm.