| 摘要 |
<p>PURPOSE:To improve efficiency and enhance operational speed of a high oil pressure apparatus by suppressing to a low level, a quantity of pressure oil returned to an oil tank through a pilot valve at the time of using the high oil pressure apparatus. CONSTITUTION:A valve body 39 is projected from the bottom part 23 of a spool 22 by the elastic force of a compression spring 26 at the time of using no high oil pressure apparatus. A pilot oil flow is thus secured by the oil passing through a throttle hole 44. The valve body 39 is pushed into a through hole 38, and the opening of the throttle hole 44 is hidden when the oil pressure at an oil supply port 17 increases. As a result, the pilot flow rate is decreased extremely.</p> |
