Multi-way changeover valve in the form of a flat slide valve with servo drive

Claim 1

A SLIDE VALVE COMPRISING, IN COMBINATION: (A) A VALVE HOUSING DEFINING A PASSAGE EXTENDING IN A PREDETERMINED DIRECTION AND HAVING TWO SPACEDLY OPPOSITE FACES IN SAID PASSAGE, (1) SAID HOUSING BEING FORMED WITH AN INLET OPENING IN ONE OF SAID FACES AND WITH TWO OUTLET OPENINGS IN THE OTHER FACE, SAID OUTLET OPENINGS BEING SPACED IN SAID DIRECTION; (B) SLIDE MEANS RECEIVED IN SAID PASSAGE FOR MOVEMENT IN SAID DIRECTION, (1) SAID SLIDE MEANS BEING FORMED WITH A BORE THERETHROUGH TRANSVERSE OF SAID DIRECTION; (C) ANNULAR RESILIENT SEALING MEANS INTERPOSED BETWEEN SAID SLIDE MEANS AND SAID ONE FACE FOR RESILIENTLY URGING SAID SLIDE MEANS TOWARD SAID OTHER FACE, (1) SAID SEALING MEANS AND SAID BORE BEING ELEMENTS OF A CONDUIT HAVING RESPECTIVE FIRST AND SECOND TERMINAL ORIFICES CONTIGUOUSLY ADJACENT SAID FACES AND CONTINUOUSLY FLARING FROM SAID SECOND TO SAID FIRST ORIFICE, THE FIRST ORIFICE BEING ADJACENT SAID ONE FACE AND HAVING A SUBSTANTIALLY GREATER CROSS SECTION THAN THE SECOND ORIFICE ADJACENT SAID OTHER FACE; AND (D) ACTUATING MEANS FOR RECIPROCATING SAID SLIDE MEANS IN SAID DIRECTION BETWEEN TWO TERMINAL POSITIONS, SAID FIRST ORIFICE COMMUNICATING WITH SAID INLET OPENING IN SAID TWO TERMINAL POSITIONS, AND SAID SECOND ORIFICE COMMUNICATING WITH ONLY ONE OF SAID OUTLET OPENINGS RESPECTIVELY IN SAID TWO POSITIONS.