Hydraulic circuit for heavy equipment option apparatus using...

Details Hydraulic circuit for heavy equipment option apparatus using... Hydraulic circuit for heavy equipment option apparatus using...

2005-12-06

2005-12-06

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C091S448000

Reexamination Certificate

active

06971302

ABSTRACT:
There is provided a hydraulic circuit for an option apparatus of heavy equipment using a boom confluence spool, comprising a poppet valve installed at a flow path of a supply side of a spool for the option apparatus, a boom confluence spool that controls the flow rate supplied to the option apparatus and work apparatus and is installed at a direct upstream of the spool of the option apparatus, a second electromagnetic proportion reducing valve that is installed at a flow path between the pilot pump and the boom confluence spool and outputs a secondary pressure in response to an electric signal from the controller and controls the boom confluence spool, and a first spool that is installed at a downstream of the poppet valve and is switched when a pressure difference between upstream and downstream of the boom confluence spool is larger than a set value.

REFERENCES:
patent: 5333449 (1994-08-01), Takahashi et al.
patent: 5493950 (1996-02-01), Kim
patent: 6745564 (2004-06-01), Koo
patent: 0 620 370 (1994-10-01), None

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