Slush pump valve with air cushioned valve head

Claim 1

A SLUSH PUMP VALVE ASSEMBLY WITH AIR CUSHIONED VALVE HEAD COMPRISING A VALVE SEAT ADAPTED TO BE SECURED IN A PUMP OUTLET PORT, SAID SEAT HAVING AN OPENING FORMED THERETHROUGH AND A SEATING SURFACE DISPOSED ABOUT ONE END OF SAID OPENING, A VALVE MEMBER, MEANS ADAPTING SAID VALVE MEMBER FOR GUIDED MOVEMENT TOWARD AND AWAY FROM SAID SEATING SURFACE, AN ENLARGED HEAD ON SAID VALVE FOR SEATING ENGAGEMENT WITH SAID SEATING SURFACE, AN AIR CHAMBER RECESS IN SAID HEAD OPENING TOWARD SAID SEAT AND A FLEXIBLE RESILIENT DIAPHRAGM AND CUSHION MEMBER DISPOSED ACROSS AND OVERLYING SAID RECESS AND THE PORTIONS OF SAID HEAD DISPOSED ABOUT SAID RECESS, MEANS SEALINGLY SECURING THE MARGINAL PORTIONS OF SAID CUSHION MEMBER TO SAID PORTIONS OF SAID HEAD, MEANS FOR INTRODUCING AIR UNDER PRESSURE INTO SAID CHAMBER, SAID RESILIENT CUSHION MEMBER, INWARDLY OF SAID SECURING MEANS, INCLUDING AN OUTER FACE COMPLEMENTARY TO AND ENGAGEABLE WITH SAID SEATING SURFACE AND COMPRISING THE SOLE CONTACT OF SAID HEAD WITH SAID SEATING SURFACE, SAID GUIDE MEANS ON SAID HEAD COMPRISING A STEM PORTION, SAID AIR INTRODUCING MEANS INCLUDING A LONGITUDINALLY EXTENDING BORE IN SAID STEM COMMUNICATING WITH SAID AIR CHAMBER RECESS, VALVE MEANS DISPOSED IN SAID BORE, THE END OF SAID BORE ADJACENT SAID AIR CHAMBER RECESS BEING INTERNALLY THREADED, AN APERTURED COVER PLATE SECURED OVER SAID CHAMBER, THE ADJOINING OUTER SURFACES OF SAID COVER PLATE AND VALVE HEAD BEING FLUSH, THE APERTURES IN SAID COVER PLATE BEING OF A SIZE TO INHIBIT THE FLOW OF AIR FROM BETWEEN SAID COVER PLATE AND SAID CUSHION MEMBER INTO SAID CHAMBER UPON SEATING ENGAGEMENT OF SAID HEAD WITH SAID SEAT, SAID COVER PLATE BEING CENTRALLY APERTURED AND HAVING A THREADED FASTENER SECURED THROUGH SAID CENTRAL APERTURE AND THREADEDLY ENGAGED IN THE ADJACENT END OF SAID BORE, SAID THREADED FASTENER INCLUDING A LONGITUDINAL BORE COMMUNICATING WITH SAID HEAD BORE AT ONE END AND TERMINATING AT THE OTHER END IN A LATERAL BORE COMMUNICATING WITH SAID AIR CHAMBER RECESS.