Hydraulic system with regenerative position

Claim 1

A HYDRAULIC SYSTEM FOR OPERATING FROM A PUMP, A PISTON AND CYLINDER IN WHICH THE CYLINDER HAS FIRST AND SECOND PORTS ON OPPOSITE SIDES OF THE PORTION AND THE PISTON HAS A LARGER EXPOSED AREA ON ONE SIDE, SAID SYSTEM COMPRISING: A SPOOL VALVE COMPRISING A VALVE BODY HAVING A BORE THEREIN AND A PLURALITY OF RECESSES INTERSECTING SAID BORE AT SPACED LOCATIONS THEREALONG AND INCLUDING A PAIR OF PUMP RECESSES FOR CONNECTING TO THE PUMP AND RETURN RECESSES FOR CONNECTION TO A RETURN LINE AND ADDITIONAL RECESSES, AND A SPOOL SLIDABLY RECEIVED IN SAID BORE AND HAVING A PLURALITY OF LONGITUDINALLY SPACED LANDS THEREON FOR SEALING ENGAGEMENT WITH THE BORE BETWEEN SAID RECESSES AND HAVING REDUCED DIAMETER PORTIONS BETWEEN ITS LANDS; A FIRST NORMALLY-CLOSED CHECK VALVE CONNECTED TO ONE OF SAID ADDITIONAL RECESSES IN THE SPOOL VALVE BODY AND HAVING A PORT FOR CONNECTION TO THE CYLINDER AT ONE SIDE OF THE PISTON, A FIRST PRESSURE RESPONSIVE MEMBER CONNECTED TO ANOTHER OF SAID ADDITIONAL RECESSES IN THE SPOOL VALVE BODY AND MOVABLE IN RESPONSE TO FLUID PRESSURE THEREAT TO OPEN SAID CHECK VALVE; A SECOND NORMALLY-CLOSED CHECK VALVE CONNECTED TO ANOTHER OF SAID ADDITIONAL RECESSES IN THE SPOOL VALVE BODY AND HAVING A PORT FOR CONNECTION TO THE CYLINDER AT THE OPPOSITE SIDE OF THE PISTON, A SECOND PRESSURE RESPONSIVE MEMBER CONNECTED TO ANOTHER OF SAID ADDITIONAL RECESSES IN THE SPOOL VALVE BODY AND MOVBLE IN RESPONSE TO FLUID PRESSURE THEREAT TO OPEN SAID SECOND CHECK VALVE;