Patent ID: 8342203

Claim:
A degassing valve for a flexible container, the valve comprising: a generally flat valve seat on a truncated generally dome shaped structure, the valve seat raised a height above a valve chamber base surface and having a valve seat outer periphery; and a resilient, flat, non-perforated diaphragm inter-engaged upon, but not mechanically held against, the valve seat and overlapping the valve seat outer periphery, the dome shaped structure having a sectional radius greater than the diaphragm radius, the diaphragm having a perimeter; such that the valve seat engages a central area of the diaphragm not proximate the perimeter of the diaphragm; the valve seat further comprising a well recessed a depth into the valve seat in a direction away from the diaphragm, the well being generally covered by the diaphragm when it is inter-engaged upon the valve seat, the depth of the well recess less than the height of the valve seat above the valve chamber base surface.