| 摘要 |
<p>PURPOSE:To prevent the oil leak to a tank passage side from an actuator passage by permitting the communication and cut-off between a tank passage and an actuator passage by a cone seat type cartridge valve, and permitting the spread of the sealing width independently of the spool stroke and the port interval. CONSTITUTION:A tank passage 21, the first and second pump passages 22 and 23, and the first and second actuator passages 24 and 25 are farmed on a valve body 20, and the first and second cartridge valves 26 and 27 for the communication and cut-off of the inlets and outlets 22a, 23a; 22b and 23b for the pump passages 22 and 23 are fitted on the valve body 20. Further, the cone shaped third and fourth cartridge valves 28 and 29 for the communication and cut-off between the actuator passages 24 and 25 and the tank passage 21 and the first and second load check valves 30 and 32 for the communication and cut-off between the outlet sides 22b and 23b of the pump passages 22 and 23 and the inlet sides 24a and 25a of the actuator passages 24 and 25 are fitted. Accordingly, the sealing width can be spread, and the oil leak into the tank passage 21 is prevented.</p> |
