| 摘要 |
PURPOSE:To control the spool speed of a countervalancing valve so as to prevent surge pressure by providing a differential valve operated by pressure difference between a pilot chamber and the interior of a feed and discharge hole and adapted to change the throttle. CONSTITUTION:Different valves 3, 4 are operated by differential fluid pressure between pilot chambers 12, 13 and each interior of feed and discharge holes 9, 10 in a counterbalancing valve 1 to change the throttle between the pilot chambers 12, 13 and the feed and discharge holes 9, 10. The operating speed of a spool 2 of the counterbalancing valve 1 is controlled by these differential valves 3, 4 so as to prevent surge pressure of a pressurized fluid circuit and generation of cavitation. |
