| 摘要 |
PROBLEM TO BE SOLVED: To allow for suppressing impact sound generated when a check valve body of a pilot check valve is separated from a valve seat, in a control valve provided with the pilot check valve between a lift-lock poppet valve and a switch valve.SOLUTION: A pilot check valve 5 is equipped with: a check valve body 7 which can move between a close valve position shutting off a high-pressure chamber 6a communicating with a back pressure chamber and an intermediate passage 6b, and an open valve position communicating with the high-pressure chamber and the intermediate passage; a valve body 6 equipped with a valve seat 6e in which the check valve body positioned at the close valve position is seated; a closing side energizing means 71 for energizing the check valve body to a side seating in the valve seat; and a pin 9 which energizes the check valve body to a side separating from the valve seat against the energizing force of the closing side energizing means when a hydraulic fluid is supplied into a pilot chamber 6x1, and can slide in a pin insertion hole provided on a valve body. The pin is equipped with a notch which communicates with the high-pressure chamber and the intermediate passage when the check valve body is arranged at the open valve position.SELECTED DRAWING: Figure 2 |
