Resilient valve seats with rentenion means

Claim 1

A SEALING ASSEMBLY FOR A VALVE HAVING A MOVABLE VALVE MEMBER, SAID SEALING ASSEMBLY COMPRISING AN ANNULAR SEAT MEMBER HAVING AN ANNULAR INTERIOR FLANGE THEREON AND HAVING AN ANNULAR PLANAR SEALING SURFACE, A RETAINER MEMBER HAVING AN EXTERNAL ANNULAR FLANGE THEREON AND HAVING AN ANNULAR PLANAR SEALING SURFACE POSITIONED COPLANAR RELATIVE TO THE PLANAR SEALING SURFACE OF SAID SEAT MEMBER, SAID RETAINER MEMBER BEING FITTED CONCENTRICALLY WITHIN SAID SEAT MEMBER AND DEFINING WWITH THE SEAT MEMBER AN ANNULAR GROOVE HAVING AN ANNULAR RESTRICTION INTERMEDIATE ITS ENDS AND AN ENLARGED PORTION AT EACH END THEREOF, ANNULAR SEALING MEMBER HAVING A BASE PORTION AND A SEALING PORTION CONNECTED BY AN INTEGRAL WEB PORTION, SAID BASE PORTION BEING RETAINED WITHIN THE INNER END OF THE GROOVE BY SAID ANNULAR FLANGES, SAID SEALING PORTION HAVING AN ANNULAR SEALING SURFACE EXTENDING BEYOND THE COPLANAR SEALING SURFACES FOR SEALING ENGAGEMENT WITH THE VALVE MEMBER, SAID WEB PORTION SUBSTANTIALLY FILLING SAID RESTRICTED PORTION OF THE GROOVE, AND THE BASE PORTION AND SEALING PORTION OF SAID SEALING MEMBER BEING OF SMALLER CROSS SECTIONAL DIMENSION THAN THE CROSS SECTIONAL DIMENSION OF THE INNER AND OUTER ENLARGED PORTIONS RESPECTIVELY OF SAID GROOVE.