Butterfly valve with particular structure for making an integral seat

Claim 1

A BUTTERFLY VALVE, COMPRISING: A UNITARY VALVE BODY OF TWO UNITIZED PORTIONS INCLUDING AN OUTER ANNULAR PORTION OF METAL AND AN INNER ANNULAR PORTION OF RUBBER-LIKE METERIAL, THE METAL PORTION HAVING A PAIR OF OPPOSITE TRUNNIONS ON A COMMON CENTER LINE EXTENDING ACROSS THE VALVE BODY AND ACROSS THE DIRECTION OF FLOW THROUGH THE VALVE, A PAIR OF SPACED SMOOTH CIRCULAR CYLINDRICAL SURFACES ON SAID METAL BODY PORTION ONE ON EITHER SIDE OF SAID COMMON CENTER LINE CONSTRUCTED AND ARRANGED TO FORM AN ANNULAR SPACE THEREBETWEEN AND HAVING A COMMON AXIS EXTENDING LONGITUDINALLY OF THE VALVE BODY, SAID AXIS INTERSECTING SAID COMMON CENTER LINE CENTRALLY BETWEEN THE TRUNNIONS AND SUBSTANTIALLY NORMAL TO SAID CENTER LINE, SAID ANNULAR PORTION OF RUBBER-LIKE MATERIAL HAVING A VALVE SEATING SURFACE PORTION CONCENTRIC WITH AND POSITIONED BETWEEN SAID CYLINDRICAL SURFACES ON SAID METAL BODY PORTION AND COMPLETELY FILLING SAID ANA SHAFT SUPPORTING SAID VALVE DISC AND MOUNTED IN SAID THE VALVE, AND NULAR SPACE, WHEREBY SAID SURFACE PORTION IS CENTRALLY POSITIONED BETWEEN THE TRUNNIONS, COOPERATING WITH SAID VALVE SEATING SURFACE TO CLOSE MEANS MAINTAINING SAID VALVE SEATING SURFACE PORTION A VALVE DISC IN SAID VALVE BODY HAVING AN OUTER EDGE VALVE BODY PORTION, OF MOLDED IN PLACE RUBBER-LIKE MEATERIAL IN SAID METAL TRUNNIONS.