Groove mounted resilient valve seat having a deformable lip

Abstract From the Canadian patent

A valve has an annular seat member coaxially mounted in a groove in the valve body around the outlet passageway. The groove has parallel sides which are perpendicular to its bottom. The seat member has a lesser radial thickness than the groove and it extends into the valve chamber terminating at an outer surface and having a lip extending from the outer surface from around the seat member annulus, and additionally having a outer annular resting surface contacting the groove bottom and an inclined inner annular bottom portion inward of the resting surface and divergent from the groove bottom toward the seat member annulus. The seat member is constructed of a deformable material with the lip …