| 摘要 |
<p>PURPOSE:To improve the responsiveness at boosting the oil pressure, by connecting the pressure detector to the servo-valve with the feed-back control circuit. CONSTITUTION:The pressure detector 7 is installed near the arbor end of the high pressure circuit 1H; the detecting signal of this pressure detector 7 is inputted to the comparator 8 which compares this input with the set point of the setter 9; the deviation signal resulted from this comparison is inputted to the servo-valve 6 through the servo-amplifier 10. Plural pilot check valves 11 are installed in the high pressure circuit 1H, these check valves 11 are successively opened correspondingly to the pressure in order to relieve the hydraulic fluid until the pressure is reduced to a prescribed value. By quickly supplying the hydraulic fluid from the accumulator 5 through the servo-valve 6, the responsiveness is good; besides, since the plural pilot check valves 11 are installed, the responsiveness at reducing the pressure also is improved.</p> |
