Explosion protection valve, in particular a non-return flap for explosion decoupling, for interrupting a fluid flow, in particular in a pipeline, comprising - a valve housing with a passage opening for the passage of the fluid flow and a valve seat arranged at the passage opening, - a closing body, in particular a flap plate, with a sealing surface, wherein - the closing body is mounted movably in the valve housing on a bearing (17, 17') in such a way that it is movable at least between a rest position, an operating position and a closing position, wherein - the closing body is in the rest position in the absence of the fluid flow, in the operating position the passage opening is opened by the closing body and in the closed position the passage opening is closed by the closing body, the closing body in the closed position resting with the sealing surface against the valve seat, wherein - the closing body is movable into the operating position under the action of an operating pressure and is movable into the closing position under the action of a closing pressure differing from the operating pressure, wherein - the closing body is arrestable, preferably automatically, in the closed position by means of a locking device, characterised in that - the bearing (17, 17') of the closing body is designed in such a way that the closing body is movable in a closing direction from the operating position into the closing position by means of a rotary movement and a linear movement, wherein the bearing (17, 17') is designed in such a way that the closing body for transition from the operating position to the closing position is movable first in the rotary movement and subsequently in the linear movement, wherein preferably one position of the closing body corresponds to the rest position during transition from the rotary movement to the linear movement, the closing body being mounted on the bearing (17, 17') via an axle body (8, 8'), preferably a second, mirror-inverted bearing (18, 18') being present and the two bearings (17, 17', 18, 18') being arranged parallel to one another on both sides of the passage opening, the closing body being mounted on both bearings (17, 17', 18, 18'), wherein the bearing (17, 17') comprises a rotary guide and a linear guide for a control body (32, 32') rigidly connected to the closing body via the axle body (8, 8'), wherein the bearing (17, 17') additionally comprises a longitudinal guide (33, 33') in which the axle body (8, 8') is rotatably and displaceably guided, wherein a displacement direction of the longitudinal guide (33, 33') is parallel to the displacement direction of the linear guide for the control body (32, 32'). - a valve housing with a passage opening for the passage of the fluid flow and a valve seat arranged at the passage opening, - a closing body, in particular a flap plate, with a sealing surface, wherein - the closing body is mounted movably in the valve housing on a bearing (17, 17') in such a way that it is movable at least between a rest position, an operating position and a closing position, wherein - the closing body is in the rest position in the absence of the fluid flow, in the operating position the passage opening is opened by the closing body and in the closed position the passage opening is closed by the closing body, the closing body in the closed position resting with the sealing surface against the valve seat, wherein - the closing body is movable into the operating position under the action of an operating pressure and is movable into the closing position under the action of a closing pressure differing from the operating pressure, wherein - the closing body is arrestable, preferably automatically, in the closed position by means of a locking device, characterised in that - the bearing (17, 17') of the closing body is designed in such a way that the closing body is movable in a closing direction from the operating position into the closing position by means of a rotary movement and a linear movement, wherein the bearing (17, 17') is designed in such a way that the closing body for transition from the operating position to the closing position is movable first in the rotary movement and subsequently in the linear movement, wherein preferably one position of the closing body corresponds to the rest position during transition from the rotary movement to the linear movement, the closing body being mounted on the bearing (17, 17') via an axle body (8, 8'), preferably a second, mirror-inverted bearing (18, 18') being present and the two bearings (17, 17', 18, 18') being arranged parallel to one another on both sides of the passage opening, the closing body being mounted on both bearings (17, 17', 18, 18'), wherein the bearing (17, 17') comprises a rotary guide and a linear guide for a control body (32, 32') rigidly connected to the closing body via the axle body (8, 8'), wherein the bearing (17, 17') additionally comprises a longitudinal guide (33, 33') in which the axle body (8, 8') is rotatably and displaceably guided, wherein a displacement direction of the longitudinal guide (33, 33') is parallel to the displacement direction of the linear guide for the control body (32, 32').