Patent ID: 8555925

Claim:
A pressure relief valve for a packaging container ( 3 ), the pressure relief valve comprising: a main body ( 4 ) with a single central through opening ( 9 ), a sealing surface ( 14 ) and a peripheral region ( 18 ), wherein the peripheral region ( 18 ) can be sealingly connected to an inner side ( 3 a ) of the packaging container ( 3 ) and wherein the sealing surface ( 14 ) has an inwardly tapering form, and a diaphragm ( 6 ), which rests on the sealing surface ( 14 ) to permit sealing, a fluid ( 5 ) being arranged between the sealing surface ( 14 ) and the diaphragm ( 6 ), wherein the diaphragm ( 6 ) is flexible and wherein a recess ( 30 ) is formed in the main body ( 4 ), wherein the central through opening ( 9 ) opens into the recess ( 30 ), wherein at the central through opening ( 9 ), an annular bead ( 12 ) is disposed that projects in the direction of the diaphragm ( 6 ) and projects into the recess ( 30 ), and wherein the single central opening ( 9 ) is symmetrically disposed with respect to an entire perimeter of the main body ( 4 ).