Ball valve with adjustable seat seals

Claim 1

IN A BALL VALVE, A GENERALLY CYLINDRICAL VALVE BODY, A SPHERICAL VALVE MEMBER DISPOSED WITHIN THE BODY, A PAIR OF ANNULAR SEALS CONCENTRICALLY DISPOSED WITHIN OPPOSITE ENDS OF THE VALVE BODY AND FORMING OPPOSED SEATS FOR THE VALVE MEMBER, MEANS FOR RETAINING SAID VALVE MEMBER AND SEALS IN ASSEMBLY WITHIN THE BODY COMPRISING A PAIR OF ALIGNED GENERALLY CYLINDRICAL INSERTS TELESCOPICALLY AND SILDABLY RECEIVED WITHIN OPPOSITE ENDS OF THE VALVE BODY IN ALIGNMENT WITH SAID SEALS, EACH OF SAID INSERT HAVING A CONVEX SURFACE FACING GENERALLY OUTWARDLY OF THE VALVE BODY, A NOSE PIECE GENERALLY ALIGNED WITH EACH INSERT AND HAVING A CONVEX END SURFACE IN ENGAGEMENT WITH THE CONVEX END SURFACE OF THE INSERT, EACH INSERT FURTHER HAVING A GENERALLY ANNULAR EXTERNAL SURFACE FACING OUTWARDLY OF THE VALVE BODY AND INCLINED OUTWARDLY OF THE NOSE PIECE AND TOWARD SAID INSERT, AND A RETAINING COLLAR RESPECTIVELY ASSOCIATED WITH EACH NOSE PIECE, EACH COLLAR BEING THREADABLY MOUNTED ON THE VALVE BODY FOR MOVEMENT GENERALLY LONGITUDINALLY OF THE NOSE PIECE AND HAVING AN INCLINED