Ball valve

Claim 1

IN A WELDED BALL VALVE OF THE TYPE IN WHICH THE SEALS ARE IN PLACE, THE VALVE IS IN ITS OPEN POSITION AND A COOLANT FLOWS THROUGH THE OPEN VALVE DURING WELDING, A THREE PART HOUSING, TWO PARTS BEING END MEMBERS BUTTED TOGETHER AND ONE PART BEING A BONNET MEMBER, SAID MEMBERS HAVING PASSAGEWAYS EXTENDING FROM END TO END WITH THEIR AXES INTERSECTING, EACH END MEMBER INCLUDING AN INTEGRAL INTERNAL ANNULAR RIB BETWEEN THE ENDS OF ITS PASSAGEWAY, THE ABUTTING PORTIONS OF THE END MEMBERS PROVIDING A CYLINDRICAL CHAMBER WITH THE PROXIMATE RIB FACES BEING THE END BOUNDARIES THEREOF, THE PROXIMATE FACE OF EACH RIB HAVING AN ANNULAR RECESS SPACED RADIALLY INWARDLY OF THE CYLINDRICAL CHAMBER WALL, AN ELASTIC RING SEAL OF PLASTIC STOCK IN EACH RECESS, AN APPROXIMATELY SPHERICAL VALVE MEMBER IN SAID CHAMBER HAVING A PASSAGEWAY EXTENDING THROUGH IT, SAID CHAMBER AND SAID VALVE MEMBER BEING SO DIMENSIONED THAT SAID MEMBER COMPRESSES AND RINGS AND SO FITS SAID CHAMBER AS TO ESTABLISH AN AIR GAP BETWEEN IT AND SAID CYLINDRICAL WALL, SAID END MEMBERS ALSO HAVING COMPLEMENTAL RECESSED PORTIONS IN THEIR ABUTTING END DEFINING SIDE OPENING IN COMMUNICATION WITH SAID CHAMBER, SAID BONNET MEMBER BEING ENTRANT OF SAID SIDE OPENING, A VALVE OPERATING MEANS EXTENDING AXIALLY THROUGH AND SUPPORTED BY SAID BONNET MEMBER TO BE TURNED RELATIVE THERETO, AND WELD SEAMS, ONE JOINING THE ABUTTING ENDS OF THE END MEMBERS AND THE OTHER JOINING THE BONNET MEMBER TO SAID RECESSED PORTIONS, SAID INTERNAL RIBS CONSTITUTING HEAT CONDUCTING SHIELDS OF SAID RING SEALS DURING THE FORMATION OF SAID WELD SEAMS.