Flat valve for hydraulic machine

Claim 1

IN A HYDRAULIC MACHINE COMPRISING A ROTATABLE CYLINDER UNIT HAVING A COAXIAL END FACE HAVING AN ODD NUMBER OF CIRCUMFERENTIALLY SPACED CYLINDER PORTS AND A STATIONARY END HEAD HAVING AN ANNULAR FACE COXIAL WITH SAID CYLINDER UNIT, AN ANNULAR FLAT VALVE ADAPTED TO BE NON-ROTATABLY SUPPORTED ON SAID END HEAD FOR AXIAL MOVEMENT RELATIVE THERETO FOR SEALING ENGAGEMENT WITH SAID END FACE OF SAID CYLINDER UNIT, SAID FLAT VALVE HAVING DIAMETRICALLY OPPOSITE ARCUATE SUPPLY AND EXHAUST PORTS WITH WHICH SAID CYLINDER PORTS ALTERNATELY REGISTER UPON ROTATION OF SAID CYLINDER UNIT, HYDRAULIC HOLD-UP MOTORS UNDER THE PORTS OF THE FLAT VALVE TO URGE THE FLAT VALVE TOWARD THE CYLINDER UNIT, AUXILLARY HYDRAULIC HOLD-UP MOTORS IN OPPOSITE SEGMENTS OF THE FLAT VALVE BETWEEN THE PORTS THEREOF, AXIAL PASSAGES IN THE SEGMENTS OF THE FLAT VALVE CONNECTING THE AUXILLARY HOLD-UP MOTORS TO THE FACE OF THE SEGMENT FOR SUCCESSIVE REGISTRATION WITH THE CYLINDER PORTS CROSSING THE FACE OF THE SEGMENT UPON ROTATION OF THE CYLINDER UNIT, AN ANNULAR MEMBER SECURED TO SAID FLAT VALVE A CIRCUMFERENTIALLY EXTENDING PASSAGE FORMED IN ONE OF THE ABUTTING SURFACES OF SAID ANNULAR MEMBER AND FLAT VALVE, AND CONNECTING PASSAGES IN SAID FLAT VALVE CONNECTING SAID AUXILIARY HOLDUP MOTORS IN BOTH SEGMENTS TO SAID CIRCUMFERENTIALLY EXTENDING PASSAGE.