Pump valve

Claim 1

A PUMP VALVE, COMPRISING A VALVE SEAT HAVING AN UPWARDLY AND OUTWARDLY INCLINED FRUSTO-CONICAL SEATING SURFACE, A VALVE MEMBER HAVING AN UPWARDLY AND OUTWARDLY INCLINED SEATING SURFACE FOR ENGAGEMENT WITH THE LOWER PORTION OF SAID SEATING SURFACE ON SAID VALVE SEAT, A SEAL MEMBER SUPPORTED ON SAID VALVE MEMBER, SAID SEAL MEMBER HAVING AN UPWARDLY AND OUTWARDLY INCLINED FRUSTO-CONICAL SEATING SURFACE FOR ENGAGEMENT WITH THE UPPER PORTION OF SAID SEATING SURFACE ON SAID VALVE SEAT, THE SEATING SURFACE ON SAID SEAL MEMBER, WHEN UNSEATED, PROJECTING BEYOND THE SEATING SURFACE ON SAID VALVE MEMBER, AND AN ANNULAR SHOCK PLATE HAVING AN OUTER DIAMETER LESS THAN THE OUTER DIAMETER OF SAID SEAL MEMBER AND BEING POSITIONED ON THE SIDE OF SAID SEAL MEMBER OPPOSITE SAID SEATING SURFACE ON SAID SEAL MEMBER AND SUPPORTED ON SAID VALVE MEMBER WHEREBY THE SHOCK OF CLOSING OF SAID VALVE MEMBER ON SAID VALVE SEAT IS EXERTED THROUGH SAID SEAL MEMBER TO SAID ANNULAR SHOCK PLATE, SAID SEAL MEMBER HAVING SUFFICIENT HARDNESS TO TRANSMIT THE IMPACT OF CLOSING TO SAID ANNULAR SHOCK PLATE AND SUFFICIENT RESILIENCY TO DEFORM TO PROVIDE A SEAL ON SAID UPPER PORTION OF SAID SEATING SURFACE ON SAID VALVE SEAT WHEN SAID VALVE MEMBER IS SEATED, SAID SHOCK PLATE BEING RESILIENT, THE RESILIENCY OF THE SHOCK PLATE AND THE HARDNESS OF SAID SEAL MEMBER BEING SO RELATED THAT SEATING OF THE VALVE MEMBER EFFECTS ELASTIC DEFORMATION OF THE SHOCK PLATE SO AS TO ABSORB THE SHOCK OF SUCH SEATING.