Pivoted disc valve having a particular mounting arrangement

Claim 1

A DENTAL SUCTION VALVE COMPRISING IN COMBINATION: AN ELONGATED BODY MEMBER HAVING AN INTERNAL CENTRAL FLUID PASSAGE TERMINATING IN AN EXIT OPENING AT ONE END AND AN ENTRANCE OPENING AT ITS OTHER END, SAID BODY MEMBER INCLUDING A MANUAL HOLDING HANDLE THREADEDLY CONNECTED TO THE REMAINING PORTION OF SAID BODY MEMBER ADJACENT TO SAID ONE END, THE SAID OTHER END OF SAID BODY MEMBER TERMINATING IN A NOSE PIECE HAVING AN INNER END TERMINATING IN A FLAT GROUND SURFACE DEFINED BY AN ARCUATE CUT OUT PORTION, A CENTRAL PORTION OF SAID BODY MEMBER INCLUDING A VALVE PLATE THREADEDLY CONNECTED TO SAID HANDLE ON ONE END, THE OTHER END OF SAID VALVE PLATE TERMINATING IN A FLAT SMOOTHLY GROUND SURFACE JUXTAPOSED SAID FLAT GROUND SURFACE OF SAID NOSE PIECE; AND A VALVE DISC HAVING FLAT OPPOSITE SMOOTHLY GROUND SURFACES POSITIONED IN SAID ARCUATE CUT-OUT PORTION SO THAT ITS AXIS RUNS PARALLEL TO AND SPACED FROM THE LONGITUDINAL AXIS OF SAID BODY MEMBER, AND ITS OPPOSITE SURFACES ARE IN FLUID TIGHT ENGAGEMENT WITH SAID SMOOTHLY GROUND SURFACES OF SAID NOSE PIECE AND VALVE PLATE, A PERIPHERAL PORTION OF SAID DISC EXTENDING FROM THE SIDE OF SAID BODY MEMBER TO BE EXPOSED SO THAT IT MAY BE MANUALLY ROTATED TO ROTATE SAID DISC ABOUT ITS OWN AXIS, SAID DISC INCLUDING AN OFF-CENTER OPENING ADAPTED TO REGISTER WITH SAID CENTRAL FLUID PASSAGE WHEN IN A FIRST POSITION AND TO BE MOVED OUT OF REGISTRATION WITH SAID FLUID PASSAGE SO THAT ANOTHER PORTION OF SAID DISC BLOCKS SAID FLUID PASSAGE WHEN SAID DISC IS ROTATED TO A SECOND POSITION, A PORTION OF SAID DISC INCLUDES A CURVED OPENING; SCREWS FOR SECURING SAID VALVE PLATE TO SAID NOSE PIECE, ONE OF SAID SCREWS PASSING THROUGH SAID CURVED OPENING TO FUNCTION AS A STOP AND THEREBY LIMIT ROTATION OF SAID DISC BETWEEN SAID FIRST AND SECOND POSITION.