| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid pressure control apparatus comprising an operation check valve and a meter-out control valve whose manufacture costs are reduced.SOLUTION: A fluid pressure control apparatus comprises a switch valve 22 which switches operation of an operation check valve by operating in cooperation with a control valve by pilot pressure supplied through a pilot valve. The switch valve 22 comprises a pilot chamber 23 to which the pilot pressure is introduced, a spool 56 that moves in accordance with the pilot pressure of the pilot chamber 23, a pressing member 36 that presses the spool 56 toward a valve-closing direction, a collar 51 that is mounted to be freely detachable to the pilot chamber 23, and a piston 50 that is inserted into the collar 51 to be freely slidable so as to apply thrust force that resists against pressing force of the pressing member 36 to the spool 56 upon receiving the pilot pressure on the back face. |
