Directional control valve

Claim 1

A VALVE FOR CONTROLLING A SINGLE ACTING HYDRAULIC CYLINDER AND A DOUBLE ACTING HYDRAULIC CYLINDER, COMPRISING A BODY HAVING TWO PARALLEL BORES THEREIN AND CONTAINING A PASSAGE FOR SUPPLY FLUID, A PASSAGE FOR FLUID RETURN, A PASSAGE FOR CONNECTION TO ONE END OF EACH END OF THE CYLINDER AND A PASSAGE FOR CONNECTION TO EACH END OF THE DOUBLE ACTING CYLINDER, A SPOOL IN EACH OF SAID BORES FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID PASSAGES TO AND FROM THE CYLINDERS, A SPRING MEANS CENTRALIZING SAID SPOOLS IN NEUTRAL HOLD POSITION, EACH OF SAID LAST MENTIONED PASSAGES HAVING A CYLINDRICAL CHAMBER WITH A PORT AND VALVE SEAT AT ONE END, AND A POPPET VALVE IN EACH OF SAID CHAMBER, INCLUDING A CYLINDRICAL VALVE ELEMENT HAVING A FRUSTO-CONICAL PORTION ADJACENT THE VALVE SEAT SUBJECTED TO THE PRESSURE OF FLUID IN THE PASSAGE BETWEEN THE CHAMBER AND CYLINDER TENDING TO UNSEAT SAID ELEMENT, A HOLLOW CENTER OPEN-END STEM ON SAID ELEMENT EXTENDING INTO SAID PORT AND HAVING A PLURALITY OF GRADUATED HOLES THERETHROUGH FOR CONTROLLED FLUID FLOW, SAID ELEMENT HAVING A HOLLOW INTERIOR AND AN ORIFICE CONNNECTING SAID INTERIOR WITH THE HOLLOW CENTER OF SAID STEM AND RESTRICTED ORIFICE CONNECTING SAID INTERIOR WITH THE PASSAGE TO THE CYLINDER, A VALVE MEANS IN SAID ELEMENT FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID FIRST MENTIONED ORIFICE, A SPRING URGING SAID VALVE MEANS TO ITS CLOSED POSITION, A STEM SOF OPENING SAID VALVE MEANS, A DOUBLE ACTING PISTON RESPECTIVE TO SUPPLY PRESSURE FOR OPERATING THE STEM OF THE POPPET VALVES IN EACH PASSAGE FOR THE DOUBLE ACTING CYLINDER, AND A MECHANICAL LINKAGE INCLUDING A BIFURCATED LEVER OPERATED BY THE MOVEMENT OF THE SPOOL CONTROLLING THE FLOW OF FLUID TO THE SINGLE ACTING CYLINDER FOR OPERATING THE STEM OF THE POPPET VALVE IN SAID PASSAGE.