HYDRAULIC CONTROL VALVE FOR CONSTRUCTION MACHINERY

WIPO Patent Application WO/2014/027706

A1

The present invention relates to a hydraulic control valve for construction machinery that is used to maintain secondary pilot pressure which is formed proportionally to the switching of a switching device so as to be equal to or below a setting pressure of a pilot pump. The hydraulic control valve of the present invention includes: a port of the pilot pump into which the pilot pressure flows; a tank port to which the pilot pressure is drained; a valve body at which a secondary pilot pressure port that selectively communicates with the port of the pilot pump and the tank port is formed; the switching device that is pivotally mounted on the valve body; a pilot control valve that is linked through pressurization of the switching device and has a spool which forms the secondary pilot pressure proportional to the amount of switching of the switching device by communicating the port of the pilot pump and the secondary pilot pressure port with each other during the switching; a valve spring that elastically supports the spool so as to communicate the secondary pilot pressure port and the tank port with each other; and a check poppet that is disposed in an openable and closable manner at a pilot passage whose inlet side communicates with the secondary pilot pressure port and whose outlet side communicates with the port of the pilot pump.

KU BON-SEUK (KR)

PCT/KR2012/006507

February 20, 2014

August 16, 2012

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VOLVO CONSTR EQUIP AB (SE)
KU BON-SEUK (KR)

E02F9/22; F15B13/043

JPH0925651A	1997-01-28
JP2005207499A	2005-08-04
JP2002213609A	2002-07-31
JP2749611B2	1998-05-13

See also references of EP 2886878A4
None

YOON, Eui-Seoup (KR)
윤의섭 (KR)

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