Patent ID: 7530369

Claim:
A one way valve assembly comprising: a) a support fitting having a body and a through bore, wherein a flange radially extends inward along said bore; and b) an elastomer valve piece mounted within the bore of said support fitting, wherein a flow bore extends through said valve piece, wherein said valve piece comprises an annular base having a recessed groove in a tubular sidewall displaced above a bottom surface of said base, wherein said sidewall comprises first and second opposed, convex arcuate sidewall portions that extend from said groove and taper inward to a slit apex, wherein first and second leaflets having straight, flat interior seal surfaces extend from peripheral edges of said first and second sidewall portions to mate and seal against each other at said apex, wherein said first and second sidewall portions include regions of reducing tapering thickness as said first and second sidewall portions extend from said base to said first and second leaflets, wherein said first and second sidewall portions include flat intersecting exterior surface regions that terminate to define generally V-shaped surfaces at opposite ends of said apex, and wherein said bottom surface of said valve piece exhibits a convex curvature relative to an axis parallel to the slit apex and the seal surfaces and a concave curvature relative to an axis transverse to said seal surfaces such that upon seating said groove to the fitting flange said base flexes to lie flat to said base and said sealing surfaces of said first and second leaflets compress against each other and whereby said first and second resilient leaflets expand and contract to expose and permit the passage of a media through said flow bore under forward pressure and collapse and seal against each other upon release of said forward pressure.