Single valve refrigeration control

Claim 1

A VALVE COMPRISING: A CASING HAVING AN INTERNAL VALVE BORE DEFINED BY BORE WALLS INCLUDING FIRST AND SECOND BORE PORTIONS; SAID CASING INCLUDING SPACED, FIRST AND SECOND PAIRS OF INLET AND OUTLET PORTS IN SAID FIRST AND SECOND BORE PORTIONS, RESPECTIVELY; SAID FIRST AND SECOND PAIRS OF INLET AND OUTLET PORTS IN FLUID COMMUNICATION WITH SPACED, FIRST AND SECOND PAIRS OF INLET AND OUTLET PASSAGES, RESPECTIVELY, FOR DIRECTING FIRST AND SECOND PASSAGES, RESPECTIVELY, FOR SECOND BORE PORTIONS, RESPECTIVELY; A MOVABLE VALVE MEMBER MOVABLY POSITIONED WITHIN SAID FIRST AND SECOND BORE PORTIONS, SAID VALVE MEMBER INCLUDING VALVE HEAD MEANS COMPRISING FIRST AND SECOND HEAD MEANS, AT LEAST ONE OF SAID HEAD MEANS DISPOSED IN FLUID SEALING RELATION TO SAID BORE WALLS BETWEEN SAID SPACED, FIRST AND SECOND PAIRS OF PORTS TO PREVENT COMMINGLING OF THE FIRST AND SECOND FLUIDS IN SAID FIRST AND SECOND BORE PORTIONS; SAID FIRST OR SECOND HEAD MEANS BEING AT LEAST AS LARGE AS, AND COOPERATING WITH AT LEAST ONE OF EACH OF SAID PAIRS OF FIRST AND SECOND PARTS TO PROGRESSIVELY REDUCE FLOW OF THE FIRST FLUID THROUGH SAID FIRST BORE PORTION AND SIMULTANEOUSLY PROGRESSIVELY INCREASE FLOW OF SAID SECOND FLUID THROUGH SAID SECOND BORE PORTION UPON MOVEMENT OF SAID VALVE MEMBER.