CPC E02F 9/2278 (2013.01) [E02F 9/2267 (2013.01); F15B 11/024 (2013.01); F15B 11/16 (2013.01); F15B 13/021 (2013.01); F15B 13/06 (2013.01); F15B 2211/3058 (2013.01); F15B 2211/327 (2013.01); F15B 2211/329 (2013.01); F15B 2211/45 (2013.01)] | 4 Claims |
1. A multi-control valve used in a hydraulic excavator, the multi-control valve comprising:
an arm driving spool;
a boom driving spool;
a boom sub spool; and
a housing that slidably holds the arm driving spool, the boom driving spool, and the boom sub spool, wherein
the housing includes:
an arm parallel passage, an arm crowding supply passage, and an arm pushing supply passage that are opened and closed by the arm driving spool;
a boom parallel passage, a boom raising supply passage, and a boom lowering supply passage that are opened and closed by the boom driving spool;
a slide hole that receives the boom sub spool therein;
a head-side passage that is branched off from the boom raising supply passage and extends to the slide hole;
a rod-side passage that is branched off from the boom lowering supply passage and extends to the slide hole; and
a regeneration passage that extends from the slide hole to the arm parallel passage, and
the boom sub spool is either a boom recycling spool or a boom regeneration spool,
the boom recycling spool being a spool that shifts between a neutral position at which the boom recycling spool blocks communication between the head-side passage and the rod-side passage and a recycling position at which the boom recycling spool allows the head-side passage to communicate with the rod-side passage,
the boom regeneration spool being a spool that shifts between a neutral position at which the boom regeneration spool blocks communication between the head-side passage and the regeneration passage and a regeneration position at which the boom regeneration spool allows the head-side passage to communicate with the regeneration passage.
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