Pressure relief valve with a spring-loaded membrane closing body

Pressure relief valve with a spring pressure-loaded diaphragm closing body, which in the closed position sealingly engages on a centrally positioned valve seating surface surrounding a first valve opening and whose spring pressure loading determining the sealing pressure takes place by means of a counterpressure body centrally arranged in the vicinity of and over the valve seating surface, which is surrounded by a channel-like valve chamber covered by the diaphragm closing body and provided in the valve housing body and on which on the overpressure side is provided at least one second valve opening, characterized in that the counterpressure body placed over the valve seating surface or a counterpressure plate cooperating therewith is surrounded by a diaphragm support ring held on the valve housing and which extends radially outwards from the counterpressure body over the valve chamber to the outer edge of the diaphragm closing body and above the valve chamber has a circumferential recess, whose depth measured perpendicular to the diaphragm closing body determines the maximum deflection of the diaphragm closing body, so that when the valve is completely opened the diaphragm closing body is supported in an area between the valve seating surface and its outer edge, wherein the diaphragm closing body is relieved in the closed position and planar and the valve seating surface extends parallel to the diaphragm closing body in the closed position.

Pressure relief valve with a spring pressure-loaded diaphragm closing body, which in the closed position sealingly engages on a centrally positioned valve seating surface surrounding a first valve opening and whose spring pressure loading determining the sealing pressure takes place by means of a counterpressure body centrally arranged in the vicinity of and over the valve seating surface, which is surrounded by a channel-like valve chamber covered by the diaphragm closing body and provided in the valve housing body and on which on the overpressure side is provided at least one second valve opening, characterized in that the counterpressure body placed over the valve seating surface or a counterpressure plate cooperating therewith is surrounded by a diaphragm support ring held on the valve housing and which extends radially outwards from the counterpressure body over the valve chamber to the outer edge of the diaphragm closing body and above the valve chamber has a circumferential recess, whose depth measured perpendicular to the diaphragm closing body determines the maximum deflection of the diaphragm closing body, so that when the valve is completely opened the diaphragm closing body is supported in an area between the valve seating surface and its outer edge, wherein the spring pressure loading of the counterpressure body is provided by at least one disk spring, and the counterpressure body is in the form of a plate enclosed in the support ring.