Valve mechanism

Claim 1

A VALVE MECHANISM COMPRISING IN COMBINATION A HOLLOW BODY HAVING A VALVE SEAT DEFINING AN ORIFICE THROUGH WHICH FLUID MAY FLOW IN PASSING THROUGH THE HOLLOW BODY, A NEEDLE-VALVE MEMBER MOVABLE TOWARD AND AWAY FROM SAID VALVE SEAT FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID ORIFICE, SAID HOLLOW BODY HAVING A CYLINDRICAL PORTION EXTENDING THEREFROM FOR ACCOMMODATING SAID NEEDLE VALVE MEMBER, SAID NEEDLE-VALVE MEMBER HAVING A THREADED STEM AND SAID CYLINDRICAL PORTION HAVING A THREADED BORE THREADABLY INTERENGAGED WITH SAID THREADED STEM, A SLEEVE MEMBER NON-ROTATABLY SECURED TO SAID NEEDLE-VALVE MEMBER, SAID SLEEVE MEMBER BEING MOUNTED CONCENTRIC WITH SAID NEEDLE-VALVE MEMBER AND SAID CYLINDRICAL PORTION, A PLURALITY OF ANNULAR MEMBERS OF UNIFORM THICKNESS CONCENTRICALLY MOUNTED IN A SERIES ON SAID CYLINDRICAL PORTION, THE THICKNESS OF EACH OF SAID ANNULAR MEMBERS BEING SUBSTANTIALLY EQUAL TO THE PITCH OF THE THREADS ON THE THREADED PORTION OF SAID NEEDLE-VALVE MEMBER TO PROVIDE THAT EACH ROTATION OF THE NEEDLE-VALVE MEMBER PROVIDES AXIAL MOVEMENT THEREOF SUBSTANTIALLY THE SAME AS THE THICKNESS OF SAID ANNULAR MEMBER, ADJACENT OF SAID ANNULAR MEMBERS CARRYING DIFFERENT COLOR INDICIA TO PROVIDE READY COLOR DIFFERENTIATION OF THE AXIAL POSITIONS OF THE RESPECTIVE SAID ANNULAR MEMBERS ALONG SAID CYLINDRICAL PORTION, SAID SLEEVE MEMBER HAVING A BORE ADAPTED TO ACCOMMODATE THEREIN SAID ANNULAR MEMBERS UPON TURNING THE SLEEVE MEMBER AND NEEDLE-VALVE MEMBER IN A DIRECTION TO MOVE THE NEEDLE-VALVE MEMBER TOWARD SAID VALVE SEAT, SAID CYLINDRICAL PORTION HAVING A