Title:
方向制御弁
Document Type and Number:
Japanese Patent JP3549126
Kind Code:
B2
Abstract:
The invention relates to a directional control valve which comprises a first actuator port connected to a lifting side chamber of a cylinder of a working machine, a second actuator port connected to a lowering side chamber of the cylinder of the working machine, a regeneration passage for alloying the second actuator port communicate with a regeneration port through a check valve, and a main spool adapted to move in one direction to thereby supply a pressure oil to the second actuator port and to allow the first actuator port to communicate with a tank port and the regeneration port. The directional control valve is characterized in the provision of a switching means for switching a maximum distance of movement of the main spool in one direction in a plurality of stages.
Inventors:
Naoki Ishizaki
Toshiro Takano
Toshiro Takano
Application Number:
JP30496794A
Publication Date:
August 04, 2004
Filing Date:
December 08, 1994
Export Citation:
Assignee:
KOMATSU LTD.
International Classes:
E02F9/22; F15B11/024; F15B11/12; F15B13/02; (IPC1-7): F15B11/024
Domestic Patent References:
| JP3028501A | ||||
| JP2085503A | ||||
| JP4930767A |
Foreign References:
| DE3417672A1 | ||||
| DE4402633A1 |
Attorney, Agent or Firm:
Tadashi Hamamoto
Yoshiaki Sato
Yoshiaki Sato