| 摘要 |
<p>PURPOSE:To facilitate meter-out flux control and reduce its cost by providing a pair of load check valves and communicate a meter-in flux to a tank, providing an orifice in an actuator passage and controlling the opening areas of a secondary passage and an exit passage by a pressure difference. CONSTITUTION:A spool valve 17 controlled in its position by a pilot pressure from a pilot operation valve 14, is provided in the valve body 9 of an oil pressure direction control valve and load check valves 20a, 20b are provided in a passage to actuator passages 11a, 11b through an intrance passage 12 and variable orifices 18a, 18b. Variable orifices 37a, 37b are provided on a spool valve 17 and the communication status among secondary passages 19a, 19b, exit passages 13a, 13b and a load sensing passage 38 is changed by the position of the spool valve 17. Therefore, meter-out flux control can be performed without a complex control mechanism and at a low cost.</p> |
