Multi-position distributing and regulating valve

Claim 1

IN A SLIDING PISTON DISTRIBUTING AND REGULATING VALVE ASSEMBLY INCLUDING A HOLLOW CYLINDER HAVING PORTS IN AT LEAST TWO TRANSVERSE PLANES ADAPTED FOR SELECTIVE COMMUNICATION THEREIN, A PISTON HAVING A HOLLOW CORE AND A DRAINAGE CHANNEL EXTENDING LONGITUDINALY ALONG THE SURFACE OF SAID PISTON, FOR COMMUNICATION BETWEEN SAID PORT INCLUDING PLANES, AND MEANS FOR ROTATING AND AXIALLY SLIDING SAID PISTON, THE IMPROVEMENT WHICH INCLUDES: (A) SAID PISTON HAVING A FIRST PAIR OF NON-COMMINICATING ARCUATE RECESSES ADAPTED TO COMMUNICATE WITH WAID PORTS IN A FIRST ONE OF SAID PLANES, ONE OF SAID ARCUATE RECESSES COMMUNICATING WITH SAID HOLLOW CORE OF SAID PISTON, AND SAID SECOND RECESS COMMUNICATING WITH SAID DRAINAGE CHANNEL, (B) A PLURALITY OF PAIRS OF NON-COMMUNICTING RECESSES, ALSO IN SAID PISTON, IN A PLURALITY OF PLANES AXIALLY DISPLACED FROM THE PLANE OF SAID FIRST PAIR OF ARCUATE RECESSES, EACH OF THE RECESSED IN EACH PAIR BEING ADAPTED TO COMMUNICATE WITH A SINGLE CYLINDER PORT IN SAID HOLLOW CYLINDER, AND SAID PLURALITY OF PAIRS OF NON-COMMUNICATING RECESSES EACH HAVING ONE RECESS IN COMBINATION WITH SAID HOLLOW CORE OF SAID PISTON, AND THE OTHER RECESS COMMUNICATING WITH SAID DRAINAGE CHANNEL.