Patent attributes
A fluid control valve wherein a main valve body includes: a high-pressure passage providing communication between a suction port and a sleeve in which a spool is fitted; a tank passage providing communication between a discharge port and the sleeve; a lift lock poppet located between the sleeve and a cylinder port and assuming an open position for providing communication between the sleeve and the cylinder port; a hydraulic fluid discharge passage providing communication between a back-pressure chamber provided within the lift lock poppet and the sleeve; a hydraulic fluid delivery passage located between the sleeve and the lift lock poppet; a cylinder passage located between the lift lock poppet and the cylinder port that communicates with the hydraulic fluid delivery passage when the lift lock poppet is in the open position, and a communication passage providing communication between the hydraulic fluid discharge passage and the hydraulic fluid delivery passage.
