Divided ball valve seat and trunnion

Claim 1

A BALL VALVE COMPRISING A CASING WITH AN INLET AND AN OUTLET AND A SUBSTANTIALLY FRUSTO-CONICAL VALVE CHAMBER THEREBETWEEN HAVING AN INNER END APERTURED SURFACE DEFINED BY A CURVED SURFACE AROUND THE APERTURED PORTION OF SUBSTANTIALLY SPHEROIDAL CONFIGURATION AND AN OPPOISTE OPEN PORTION; A TWO-PIECE MATED SEAT MEMBER FORMING WHEN ASSEMBLED HOLLOW FLEXIBLE PORTED SUBSTNATIALLY FRUSTO-CONICAL SECTIONS WITH COMPLEMENTARY INNER ROUNDED APERTURED PORTIONS OF SUBSTANTIALLY THE SAME CONFIGURATION AS THE VALVE CHAMBER INNER APERTURED PORTION AND BEING ENGAGED BY SAID CASING TO INHIBIT ROTATION OF SAID SEAT MEMBERS RELATIVE TO SAID CASING, THE LATTER SEAT MEMBERS SUBSTANTIALLY CONVERING THE WALL SURFACES DEFINING THE SAID VALVE CHAMBER AND HAVING ABUTTING FLAT SURFACES EXTENDING IN SUBSTANTIALLY A VERTICAL PLANE AT THE CENTER OF THE VALVE CASING AND BEING CONTIGUOUS WITH THE ROTATION INHIBITING MEANS OF SAID SEAT MEMBERS; A SPHEROIDAL PORTED CLOSURE MEMBER FITTED WITHIN SAID SEAT MEMBERS UPON ASSEMBLY OF THE LATTER; A BONNET FLEXIBLY MOUNTED AND LIMITEDLY MOVABLE AXIALLY FOR CLOSING SAID OPPOSITE OPEN PORTION OF THE VALVE CHAMBER, SAID BONNET BEING SUPPORTED BY SAID SEAT MEMBER AND SAID SPHEROIDAL PORTED VALVE CLOSURE MEMBER UPON ASSEMBLY OF THE LATTER MEMBERS WITHIN SAID VALVE CHAMBER AND HAVING AN OUTER PERIPHERAL PORTION THEREOF IN SPACED-APART RELATION TO SAID OPPOSITE OPEN PORTION OF THE VALVE CHAMBER; THE SAID VALVE CLOSURE MEMBER BEING LIMITEDLY MOVABLE AXIALLY WITH SAID BONNET AND HAVING A STEM PORTION PROJECTING THROUGH THE SAID BONNET AND HAVING A TRUNNION PORTION PROJECTING THROUGH THE ROUNDED APERTURED PORTION OF SAID VLAVE CHAMBER OF SAID CASING TO EFFECT SAID LIMITED AXIAL MOVEMENT OF SAID CLOSURE AND BONNET MEMBERS.