| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid pressure control device which can suppress an increase rate of an opening area at an initial stage of the throttling of a changeover valve.SOLUTION: A load holding mechanism 20 of a fluid pressure control device comprises a check valve for permitting a flow of a working fluid from a control valve to a load-side pressure chamber, and a changeover valve 22 interposed at a bypass passage which makes the working fluid at the load-side pressure chamber side rather than the check valve bypass the check valve 21, and introduces it to the control valve side. The check valve 22 comprises: a spool 56 which moves to a valve-opening direction according to the pilot pressure of a pilot chamber 23, and has a land part 72; an energization member 36 which energizes the spool 56 to a valve-closing direction; a spool hole 60a having, at an internal periphery, an annular slide-contact part 78 in which the spool 56 is accommodated, and with which an external periphery of the land part 72 slide-contacts; and throttles 37 which are arranged at the land part 72, and increase an opening area of a bypass passage as the spool 56 moves to the valve-opening direction. The throttles 37 are arranged in series at two stages or more along an axial direction of the spool 56. |
