Pressure relief valve with floating diaphragm
Pressure relief valve of a packaging container, comprising: a main body ( 2 ) with an edge region ( 3 ) and with a sealing face ( 4 ), wherein the edge region ( 3 ) is connectable in sealing fashion to a wall ( 10 ) of a packaging container ( 100 ) and wherein at least one passage opening ( 51 ) is formed in the sealing face ( 4 ), said passage opening extending through the main body ( 2 ), a first diaphragm ( 6 ) that is arranged over the passage opening ( 51 ) and at least partly covers the sealing face ( 4 ), a second diaphragm ( 7 ) that at least partly covers the first diaphragm ( 6 ), and a fluid ( 8 ) that is applied to the sealing face ( 4 ) and by means of which fluid the first diaphragm ( 6 ) is held on the sealing face ( 4 ) in floating fashion.
1. A pressure relief valve for a packaging container, the pressure relief valve comprising:
a main body ( 2 ) with an edge region ( 3 ) and with a sealing face ( 4 ), wherein the edge region ( 3 ) is configured to be connected in sealing fashion to a wall ( 10 ) of the packaging container ( 100 ) and wherein the sealing face ( 4 ) surrounds at least one passage opening ( 51 ) that extends through the main body ( 2 ),
a first diaphragm ( 6 ) that is arranged over the passage opening ( 51 ) and at least partly covers the sealing face ( 4 ),
a second diaphragm ( 7 ) that at least partly covers the first diaphragm ( 6 ), and
a fluid ( 8 ) that is applied to the sealing face ( 4 ), wherein the fluid ( 8 ) is arranged between the sealing face and the first diaphragm ( 6 ), wherein the fluid ( 8 ) brings about lateral mobility of the first diaphragm ( 6 ) and of the second diaphragm ( 7 ) with respect to the sealing face ( 4 ) and within the edge region ( 3 ), wherein the fluid ( 8 ) is arranged, completely in each case, between the first diaphragm ( 6 ) and the sealing face ( 4 ) and between the first diaphragm ( 6 ) and the second diaphragm ( 7 ).
2. The pressure relief valve according to claim 1 , wherein the first diaphragm ( 6 ) has a first external dimension (D 1 ) in a plane parallel to the sealing face ( 4 ), wherein the second diaphragm ( 7 ) has a second external dimension (D 2 ) in a plane parallel to the sealing face ( 4 ) and wherein the first external dimension (D 1 ) is less than or equal to the second external dimension (D 2 ).
3. The pressure relief valve according to claim 2 , wherein the first external dimension (D 1 ) and a position of the at least one passage opening ( 51 ) on the sealing face ( 4 ) are matched to one another in such a way that the first diaphragm ( 6 ) completely covers the at least one passage opening ( 51 ) in the case of any lateral displacement of the first diaphragm ( 6 ) on the sealing face ( 4 ).
4. The pressure relief valve according to claim 1 , wherein a ratio of a fluid volume of the fluid to an internal volume (V) of the main body ( 2 ) is at least 3:100.
5. The pressure relief valve according to claim 1 , wherein two passage openings ( 51 , 52 ) are formed in the main body ( 2 ) and wherein the two passage openings ( 51 , 52 ) are arranged in off-centered and symmetric fashion with respect to a central axis ( 21 ) of the main body ( 2 ).
6. The pressure relief valve according to claim 1 , wherein the first diaphragm ( 6 ) and the second diaphragm ( 7 ) are each embodied as a circular film disk.
7. The pressure relief valve according to claim 1 , wherein the first diaphragm ( 6 ) has greater flexibility than the second diaphragm ( 7 ).
8. The pressure relief valve according to claim 1 , wherein the main body ( 2 ) has a round cross-sectional form.
9. The pressure relief valve according to claim 1 , wherein the main body ( 2 ) is an injection-molded part.
10. The pressure relief valve according to claim 1 , wherein a ratio of a fluid volume of the fluid to an internal volume (V) of the main body ( 2 ) is at least 5:100.
11. The pressure relief valve according to claim 1 , wherein a ratio of a fluid volume of the fluid to an internal volume (V) of the main body ( 2 ) is no more than 3:10.
12. The pressure relief valve according to claim 1 , wherein the main body ( 2 ) is an injection-molded part and is formed from plastics.
13. A packaging container comprising at least one pressure relief valve ( 1 ) according to claim 1 .
14. The pressure relief valve according to claim 1 , wherein the fluid ( 8 ) is a liquid.
15. The pressure relief valve according to claim 1 , wherein the second diaphragm ( 7 ) is formed of plastic.
16. The pressure relief valve according to claim 1 , wherein the first diaphragm ( 6 ) is held in floating fashion on the sealing face ( 4 ) and the second diaphragm ( 7 ) is held in floating fashion on the first diaphragm ( 6 ).