Valve

Claim 1

A CONTROL VALVE COMPRISING A BODY HAVING A FLOW PASSAGE THERETHROUGH, A PORTION OF SAID BODY EXTENDING TRANSVERSELY FROM SAID PASSAGE TO FORM A HOLLOW BRANCH HAVING A CYLINDRICAL BORE OPENING INTO SAID PASSAGE; A VALVE COMPONENT HAVING A CIRCULAR HEAD ROTATABLY MOUNTED IN SAID BORE AND A BLADE CARRIED BY SAID HEAD AND PROJECTING ACROSS SAID PASSAGE AND HAVING SIDE EDGES WHICH EXTEND RESPECTIVELY FROM DIAMETRICALLY OPPOSITE POINTS ON THE PERIPHERY OF SAID HEAD AND CONVERGE SYMMETRICALLY TOWARD THE AXIS OF ROTATION OF SAID HEAD, THE CONVERGED ENDS OF SAID SIDE EDGES MERGING WITH A BLADE SAID EDGE CONNECTING PORTION REMOTE FROM SAID HEAD, SAID BODY BEING FORMED INTERNALLY ADJACENT SAID BLADE AS A SURFACE OF REVOLUTION CORRESPONDING TO THE PROFILE OF SAID BLADE, THE MAXIMUM DIMENSION OF SAID BLADE TRANSVERSELY OF THE AXIS OF ROTATION OF SAID VALVE COMPONENT BEING SMALLER THAN THE DIAMETER OF SAID BORE WHEREBY SAID BLADE MAY BE INSERTED THROUGH SAID BORE TO POSITION SAID BLADE WITHIN SAID SURFACE OF REVOLUTION, AND SAID HEAD HAVING A DIAMETER ENABLING SAID HEAD TO FIT WITHIN AND HAVE PERIPHERAL SEALING ENGAGEMENT WITH THE WALL OF SAID BORE WHEN SAID BLADE IS SO POSITIONED WITHIN SAID SURFACE OF REVOLUTION, SAID HEAD AND SAID BLADE BEING THE SOLE MOVABLE VALVE COMPONENT PARTS CONTACTABLE BY FLUID PASSING THROUGH SAID PASSAGE; AND A CAP REMOVABLY SECURED TO SAID BODY AND HAVING A PART ENGAGEABLE WITH SAID HEAD FOR EXERTING FORCE THEREON IN THE DIRECTION OF THE AXIS OF ROTATION OF SAID VALVE COMPONENT WHEREBY TO HOLD THE LATTER SO POSITIONED RELATIVELY TO SAID BODY AS TO ESTABLISH A FIT BETWEEN SAID BLADE AND SAID SURFACE OF REVOLUTION ENABLING FREE ROTATION OF SAID VALVE COMPONENT BUT PROVIDING EFFECTIVE CLOSING OF SAID PASSAGE WHEN SAID BLADE IS TRANSVERSE THERETO.