Split sleeve control valve

Claim 1

A FLOW CONTROL VALVE COMPRISING A SPLIT VALVE BODY FORMED OF TWO HALVES SECURED TOGETHER, SAID VALVE BODY HAVING INLET AND OUTLET OPENINGS, A SPLIT SLEEVE EXTENDING BETWEEN SAID INLET AND OUTLET OPENINGS AND DEFINING A FLOW PASSAGE THEREBETWEEN, SAID SPLIT SLEEVE BEING FORMED OF OPPOSED DIAPHRAGMS POSSESSING FLEXIBILITY AND HAVING LONGITUDINAL EDGES CLAMPED BETWEEN SAID VALVE BODY HALVES AND SEALED RELATIVE TO EACH OTHER ALONG THE EDGES THEREOF, MEANS FOR MOVINGG SAID DIAPHRAGMS IN OPPOSITE DIRECTIONS BETWEEN CONTACTING FLOW PASSAGE CLOSING POSITIONS AND SPACED FLOW PASSAGE OPEN POSITIONS, EACH OF SAID DIAPHRAGMS BEING PROVIDED WITH A PLURALITY OF NESTED CONTINUOUS PERIPHERAL GROOVES AND PROJECTIONS EXTENDING OVER THE ENTIRE AREA BETWEEN THE CENTRAL PORTION OF THE CLAMPED EDGES THEREOF WHEREBY TWO WAY STRETCHING OF SAID MOVABLE DIAPHRAGMS BY BENDING THE PROJECTIONS THEREOF MAY BE ACCOMPLISHED, OPPOSED TRANSVERSELY EXTENDING STRONG BACKS MOUNTED AGAINST ROTATION BEING CONNECTED TO CENTRAL PORTIONS OF SAID DIAPHRAGMS FOR CLAMPING SAID DIAPHRAGMS TOGETHER TO FORM AN EFFECTIVE SEAL, AND SAID DIAPHRAGMS MOVING MEANS BEING CONNECTED TO SAID STRONG BACKS, SAID STRONG BACKS HAVING OPPOSED FACES CONFORMING TO THE CONTOURS OF SAID DISPHRAGMS WHEREBY AN EFFECTIVE SEAL MAY BE OBTAINED.