Fluid flow control device

Claim 1

A FLUID FLOW CONTROL VALVE COMPRISING: (A) A CASING HAVING A CHAMBER FULLY OPENED AT ONE SIDE, AND HAVING AT THE UTMOST A SEMI-SPHERICAL CONCAVE SEAT OPPOSITE SAID OPEN SIDE WITH AT LEAST TWO DUCT OPENINGS OPENING INTO SAID SEAT, AT LEAST ONE OF SAID OPENINGS BEING SUBSTANTIALLY ALIGNED WITH THE AXIS OF SAID CONCAVE SEAT AND SAID OTHER OPENINGS BEING OFFSET FROM SAID ONE OPENING AT AN ANGLE TO SAID AXIS, (B) A PLUG MEANS ROTATABLE ABOUT SAID AXIS IN SAID CHAMBER ADJACENT SAID SEAT AND HAVING DUCT MEANS CONNECTABLE BETWEEN SAID ONE AND AT LEAST ONE OF SAID OTHER DUCT OPENINGS, AND HAVING A CIRCULAR GROOVE MEANS IN SAID PLUG SURROUNDING SAID DUCT MEANS AND LOCATED COMPLETELY WITHIN SAID CONCAVE SEAT WITH THE PLANE OF SAID GROOVE MEANS AT AN ANGLE TO SAID AXIS, (C) FIRST GASKET MEANS IN SAID GROOVE MEANS FOR SEALING DUCT MEANS AGAINST SAID CONCAVE SEAT, (D) SECOND GASKET MEANS SURROUNDING SAID PLUG MEANS ADJACENT SAID OPEN SIDE OF SAID CHAMBER FOR SEATING IN SAID CHAMBER, (E) MEANS FOR HOLDING SAID PLUG MEWANS IN SAID CHAMBER AND FOR CAUSING SAID PLUG BOTH TO URGE SAID FIRST GASKET MEANS AXIALLY OF SAID CHAMBER AGAINST SAID CONCAVE SEAT, AND TO MAINTAIN SAID SECOND GASKET MEANS AGAINST THE SIDES OF SAID CHAMBER ADJACENT SAID OPEN SIDE THEREOF, AND (F) MEANS FOR ROTATING SAID PLUG MEANS IN SAID CHAMBER WHEREBY SAID DUCT MEANS IN SAID PLUG MEANS OPENS AND CLOSES SAID DUCT OPENINGS IN SAID CHAMBER.