| 摘要 |
PURPOSE:To reduce surge pressure before a throttle valve in a power machine circuit, by utilizing an excessive difference of pressure caused from the surge pressure before and after the throttle valve, operating load sensing valve and connecting the spring chamber of a surge pressure absorbing valve to after the throttle valve. CONSTITUTION:If opening of a throttle valve 3 is rapidly decresed, surge pressure tends to be generated in a main line 2. In accordace with occurrence of this surge pressure, a difference of pressure before and after the throttle valve is increased, and a load sensing valve 11 is placed in a symbol position S3 to communicate a port (e) to (f), then fluid pressure after the throttle valve 3 is transmitted to a spring chamber 45 in a surge pressure absorbing valve 4. That is, pressure in the spring chamber 45 of the surge pressure absorbing valve 4 is reduced from pressure before the throttle valve 3 to pressure after the throttle valve 3. In consequence, the surge pressure absorbing valve 4 is surely opened, and surge pressure generated before the throttle valve can be reduced as compared with conventional pressure. |
