Patent ID: 8758305

Claim:
A low-pressure check valve for use in medical technology comprising: a housing comprising an inlet half and an outlet half, wherein the housing includes an inlet channel and an outlet channel; an annular valve seat formed in the outlet half and opening into the outlet channel; a pressure space comprising a first pressure chamber and a second pressure chamber; a diaphragm, wherein the diaphragm is contacting the annular valve seat and is under tension, and wherein the diaphragm overlaps an annular supporting wall of the housing upstream to an annular cup-shaped skirt; a first valve mechanism formed by the annular valve seat and the diaphragm; and a second valve mechanism, wherein the second valve mechanism is formed by the annular cup-shaped skirt formed at an outer radial margin of the diaphragm; has a free outer edge contacting an interior wall of the housing; and separates the pressure chambers from each other, wherein the second valve mechanism opens at an over-pressure in the first pressure chamber; and closes at an over-pressure in the second pressure chamber.