Patent ID: 6945277

Claim:
An underpressure valve, the valve comprising: a first housing part having an axial, central first flow channel, said first flow channel having an upper and a lower opening; a second housing part attached to said first housing part, said second housing part having a second flow channel, said second flow channel having an upper opening and an edge defining a lower opening, said second housing part also having a central depression extending in a substantially radial direction from said edge; and a closing body having a central opening-free section and at least one radially outward opening, said closing body clamped between said first housing part and said second housing part, wherein said central depression, said edge, and said closing body are structured and dimensioned such that, in response to application of vacuum at said second flow channel upper opening, air flows through said first flow channel, out of said first flow channel upper opening, through said closing body opening, through said central depression, and past said edge into and through said second flow channel and, upon attainment of a defined flow velocity through said central depression, said central opening-free section is urged by an underpressure in said central depression to seal against said edge and block further air flow.