HOLDING VALVE FOR CONSTRUCTION EQUIPMENT

WIPO Patent Application WO/2012/091194

A1

The present invention relates to a holding valve that is used for a hydraulic circuit for controlling a working device actuator of construction equipment, and to a holding valve for construction equipment in which a double nut and a sleeve are removed such that an assembling efficiency is improved and the cost is reduced, and further, the abnormal assembling of a piston can be prevented. According to the present invention, a holding valve for construction equipment comprises: a valve block which includes a space portion, a vertical hole, and a plurality of drain flow paths, wherein the space portion is installed between a working device actuator and a direction control valve and is formed on the upper side, and the vertical hole is formed on the lower part of the space portion; a spool assembly which includes a spool, a spool guide, and a ring member, wherein the spool is coupled with the vertical hole of the valve block to allow a sliding motion therein, the spool guide is inserted into an outer surface of the upper end of the spool, and the ring member is interposed between the outer surface of the upper end of the spool and an inner surface of the spool guide and fixes the spool and the spool guide; an elastic member which is inserted into the outer surface of the spool guide, wherein a lower end of the elastic member is mounted on a surface that is adjacent to the vertical hole of the valve block and an upper end thereof is supported by the spool guide; a piston which is mounted in the space portion of the valve block such that the piston is positioned on the upper part of the spool, forms a pilot pressure chamber, and slides in a lower direction if an external pilot signal pressure is applied; and a holding poppet which is mounted on the direction control valve such that the holding poppet is positioned on the lower part of the spool, and has a back chamber filled with a hydraulic fluid.

WO/2011/009527	HYDRAULIC CIRCUIT ARRANGEMENT FOR CONTROLLING A DOUBLE-ACTING WORKING CYLINDER BY MEANS OF A CONTROL VALVE HAVING FIVE PORTS
JP08105405	MONO-BLOCK CONTROL VALVE WITH REGENERATION PASSAGE
WO/2012/088892	ROTATING VALVE AND ROTATING CONTROL LOOP USING SAME

KANG, Min-Heuk (134-804, NoblePark Apt. Ballim-dong,Seongsan-gu, Changwon-si, Gyeongsangnam-do 642-765, 642-765, KR)
강민혁 (경상남도 창원시 성산구 반림동 노블파크아파트 134-804, 642-765 Gyeongsangnam-do, 642-765, KR)

KR2010/009407

July 05, 2012

December 28, 2010

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VOLVO CONSTRUCTION EQUIPMENT AB (S- Eskilstuna, S-631 85, SE)
볼보 컨스트럭션 이큅먼트 에이비 (에스킬스투나, Eskilstuna, S-631 85, SE)
KANG, Min-Heuk (134-804, NoblePark Apt. Ballim-dong,Seongsan-gu, Changwon-si, Gyeongsangnam-do 642-765, 642-765, KR)

F15B13/02; E02F9/22; F15B13/043; F16K11/07

YOON, Eui-Seoup (17F, UNIK Bldg. 706-13,Yeoksam-dong, Gangnam-gu, Seoul 135-080, 135-080, KR)

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