High-low speed hoist valve

Claim 1

IN COMBINATION, A FLUID PRESSURE OPERATED JACK COMPRISING A CYLINDER, A PISTON RECIPROCABLY DISPOSED WITH SAID CYLINDER AND INCLUDING A PISTON HEAD AND A PISTON ROD RIGIDLY SECURED THERETO AND EXTENDING OUT OF SAID CYLINDER, A PASSAGEWAY IN SAID PISTON HEAD COMMUNICATING THE PISTON ROD SIDE OF SAID CYLINDER TO THE PISTON HEAD SIDE THEREOF, ONE-WAY CHECK VALVE MEANS IN SAID PASSAGEWAY PERMITTING FLUID FLOW FROM THE PISTON ROD SIDE OF SAID CYLINDER TO PISTON HEAD SIDE THEREOF WHEN THE PRESSURE INTHE FORMER EXCEEDSS THAT IN THE LATTER; A SELECTOR VALVE COMPRISING A VALVE BODY, A FLUID PRESSURE INLET PORT IN SAID BODY, AN EXHAUST PORT IN SAID BODY, A FIRST PRESSURE PORT IN SAID BODY COMMUNICATING WITH THE PISTON HEAD SIDE OF SAID CYLINDER, A SECOND PRESSURE PORT IN SAID BODY COMMUNICATING WITH THE ROD SIDE OF SAID CYLINDER, AND A MOVABLE VALVE MEMBER IN SAID BODY SELECTIVELY CONTROLLING COMMUNICATION BETWEEN SAID RESPECTIVE PORTS, SAID VALVE MEMBER HAVING A FIRST POSITION COMMUNICATING SAID FIRST PRESSURE PORT WITH SAID INLET PORT AND PREVENTING FLUID FLOW THROUGH SAID SECOND PRESSURE PORT THEREBY CAUSING THE PRESSURE IN THE ROD SIDE OF SAID CYLINDER TO EXCEED THAT IN THE PISTON HEAD SIDE THEREOF AND FLUID TO FLOW THROUGH SAID PASSAGEWAY, AND A SECOND POSITION COMMUNICATING SAID FIRST PRESSURE PORT WITH SAID INLET PORT AND SAID SECOND PRESSURE PORT WITH SAID EXHAUST PORT WHEREBY THE PRESSURE OF THE FLUID ON THE ROD SIDE OF SAID CYLINDER IS MAINTAINED BELOW THAT IN THE PISTON HEAD SIDE THEREOF.