Orifice valve assembly

Claim 1

IN AN ORIFICE VALVE ASSEMBLY, A BODY HAVING A FLOW PASSAGE THERETHROUGH, A PLUG ROTATABLY MOUNTED IN THE BODY FOR VALVING SAID PASSAGE AND PROVIDED WITH A FLOW PASSAGEWAY PROJECTED THERETHROUGH TRANVERSELY OF THE AXIS OF PLUG ROTATION, AN OPERATING FORMATION CARRIED BY THE PLUG ON ONE SIDE THEREOF FOR TRANSMISSION OF ROTATION THERETO, SAID PLUG HAVING A NARROW PLATE RECEIVING SLOT WHICH OPENS INTO THE PLUG FROM THE SIDE THEREOF OPPOSITE SAID OPERATING FORMATION AND IS EXTENDED INTERNALLY OF THE PLUG ACROSS AND IN INTERSECTING RELATION WITH SAID FLOW PASSAGEWAY IN THE PLUG, AN ORIFICE CONTAINING CARRIER PLATE COMPRISING A DISKLIKE MAIN PORTION FOR SLIDABLE RECEPTION IN SAID SLOT IN THE PLUG AND A PRONG HANDLE PORTION FOR PROJECTION FROM THE MEAIN PORTION BEYOND AND PLUG AND ON THE AXIS OF PLUG ROTATION, SAID BODY HAVING AN OPENING COAXIAL WITH SAID AXIS FOR RECEIVING SAID PRONG HANDLE AND ACCOMMODATING HANDLE ROTATION WITH THE PLUG AND ALSO HAVING SLOTTED PORTIONS PROJECTED OPPOSITELY FROM SAID OPENING FOR ALIGNED CO-OPERATION WITH THE SLOT IN SAID PLUG ONLY WHEN THE SAME IS IN BODY PASSAGE CLOSING POSITION AND A REMOVABLE CLOSURE MEMBER SECURED TO THE BODY TO CLOSE SAID OPENING AND THE SLOTTED PORTIONS PROJECTED OPPOSITELY FROM THE OPENING, SAID PRONG HANDLE CARRYING MANIPULATIVE TOOL ENGAGEABLE FORMATIONS WHICH ARE EXPOSED FOR MANIPULATIONU WHEN THE CASING CLOSURE MEMBER IS REMOVED.