Flanged seat cup valve member with retention means

Claim 1

A VALVE FOR CONTROLLING FLUID FLOW COMPRISING; A VALVE BODY HAVING INLET AND OUTLET PORTS; A PASSAGEWAY IN THE VALVE BODY INTERCONNECTING SAID PORTS; SAID PASSAGEWAY INCLUDING A BORE DEFINING A SEAL CHAMBER AND A COUNTERBORE COAXIAL WITH SAID CHAMBER; A RADIAL SHOULDER FORMED AT THE JUNCTURE OF THE SEALED CHAMBER AND THE COUNTERBORE IN SAID BODY; A SEALING SEAT DEFINED BY THE SEAL CHAMBER TRANSVERSE THE AXIS OF THE PASSAGEWAY; SAID SHOULDER INCLUDING A GROOVE FORMED THEREIN CONCENTRIC WITH SAID PASSAGEWAY AND WHICH DEFINES A LIP COAXIAL WITH SAID PASSAGEWAY EXTENDING AWAY FROM SAID SEALING SEAT; A STEM IN THE SEAL CHAMBER HAVING ONE END OPPOSED TO THE SEALING SEAT IN GENERALLY ALIGNED RELATIONSHIP THEREWITH; RESILIENT SEALING MEANS DISPOSED IN THE SEAL CHAMBER AND RECEIVED OVER SAID ONE END PORTION OF SAID STEM: SAID RESILIENT SEALING MEANS INCLUDING A LONGITUDINALLY EXTENDING NIPPLE PORTION HAVING A TRANSVERSE END WALL ADAPTED TO ENGAGE SAID SEAT AND A TRANSVERSE RADIAL FLANGE ADAPTED TO ENGAGE SAID SHOULDER; ANNULAR COMPRESSING MEANS HAVING A DIAMETER SUBSTANTIALLY EQUAL TO THE DIAMETER OF SAID FLANGE DISPOSED IN SAID PASSAGEWAY SURROUNDING SAID STEM MEANS AND HAVING A PORTION THEREOF EXTENDING TOWARDS SAID SHOULDER IN SAID BODY TO CLAMP SAID FLANGE THEREBETWEEN; SAID FLANGE, WHEN CLAMPED BY SAID COMPRESSING MEANS, HAVING A PORTION THEREOF IN SAID GROOVE WITH THE DIMENSION OF SAID PORTION OF SAID COMPRESSING MEANS IN CONTACT WITH SAID FLANGE BEING SUBSTANTIALLY EQUAL TO THE WIDTH OF SAID GROOVE; SPRING MEANS INTERPOSED BETWEEN SAID ONE END OF SAID STEM AND SAID COMPRESSING MEANS BIASING SAID STEM TOWARD SAID SEAT; A BONNET ROTATABLY RECEIVED OVER SAID STEM AND THREADED ON THE EXTERIOR OF SAID VALVE BODY WITH SAID BONNET ABUTTING SAID COMPRESSING MEANS AND THEREBY EXERTING A CLAMPING FORCE AGAINST SAID FLANGE; AND MEANS TO RECIPROCATE SAID STEM AGAINST THE BIAS OF SAID SPRING MEANS.