| 摘要 |
<p>PURPOSE:To obtain the titled circuit capable of effecting the lap operation of the low-pressure load and the high-pressure load surely by one hydraulic circuit by a method wherein the hydraulic oil of the high-pressure load side is prevented from flowing into the low-pressure load side upon the lap operation of the low- pressure load and the high-pressure load. CONSTITUTION:A non-return valve 22, closing a short-circuiting circuit 21 upon receiving a pilot pressure, is provided in the short-circuiting circuit 21, short- circuiting a first delivery circuit 15, extending from a pumping device 13 to the low-pressure load, and the second delivery circuit 19, extending from the same device 13 to the high-pressure load. The delivery circuit 19 and the pilot port of the non-return valve 22 are connected and a pilot circuit 23, having a switching valve 24 providing and stopping the pilot pressure, is provided on the way of said connection.</p> |
