Gate valve

Claim 1

A GATE VALVE HOUSING COMPRISING TWO COMPLEMENTARY GENERALLY DISHED HALVES HAVING RESPECTIVE PERIPHERAL EDGE FLANGES UNITABLE IN A PARTING PLANETO PROVIDE RESPECTIVE LOWER BODY PORTIONS HAVING WITHIN THEM, WHEN ASSEMBLED, A VALVE CHAMBER, ONE SAID BODY PORTION HAVING AN INLET PORT APERTURE THEREIN DEFINED BY FIRST AND SECOND TUBULAR STUB CONDUITS, THE FIRST SAID CONDUIT EXTENDING INTO SAID CHAMBER AND THE SECOND SAID CONDUIT EXTENDING OUTSIDE SAID CHAMBER, THE OTHER SAID BODY PORTION HAVING AN OUTLET PORT APERTURE DEFINED BY RESPECTIVE THIRD AND FOURTH STUB CONDUITS, THE THIRD SAID CONDUIT EXTENDING WITHIN SAID CHAMBER AND THE FOURTH SAID CONDUIT EXTENDING OUTSIDE SAID CHAMBER, THE INNER ENDS OF THE FIRST AND THIRD CONDUITS BEING SPACED APART, SAID INNER ENDS BEING FORMED TO RESPECTIVE PLANAR CONTOURS AND BEING DOWNWARDLY CONVERGENT TO PROVIDE RESPECTIVE VALVE SEATS FOR A DOWNWARDLY CONVERGENT WEDGE-SHAPED VALVE HEAD INTENDED FOR MANIPULATION BY A VALVE STEM CONNECTED TO SAID HEAD FOR MOVING SAID HEAD TO A CLOSED OR OPEN POSITION, SAID HALVES, WHEN ASSEMBLED, PROVIDING A BONNET EXTENDING UPWARDLY FROM SAID BODY PORTIONS, EACH BONNET HALF BEING INTEGRAL WITH ITS ASSOCIATED BODY PORTION, EACH BONNET HALF HAVING MATCHING SEMI-CYLINDRICAL VERTICALLY EXTENDING BORES CENTRALLY LOCATED WHEREBY, WHEN THE DISHED HALVES ARE ASSEMBLED, THE BONNET HALVES PROVIDE A BORE THROUGH WHICH A VALVE STEM CAN EXTEND, EACH BONNET HALF BEING CAST, IN LINE WITH SAID BORE, WITH ONE HALF OF A THREAD TO RECEIVE A THREADED PORTION OF A VALVE STEM WHEN SAID HALVES ARE ASSEMBLED, AND EACH DISHED HALF BEING FORMED AS A SINGLE INTEGRAL CASTING WITHOUT RE-ENTRANT BENDS OR UNDERCUT RECESSES WHEREBY SAID HALF CAN BE WITHDRAWN FROM ITS DIE WITHOUT THE USE OF MULTIPART MOLDS, DIES, OR CORES.