Title:
HYDRAULIC CONTROL VALVE FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2011/145755
Kind Code:
A1
Abstract:
The present invention relates to a hydraulic control valve which may variably control the flow of a working fluid supplied to a hydraulic cylinder to operate equipment such as a boom and an arm. One embodiment of the hydraulic control valve for construction machinery of the present invention, which controls the working fluid supplied to the hydraulic cylinder to operate the machinery, includes: a valve block in which an input port and an output port are disposed; a check valve including a first throttling part to enable the working fluid to flow from the input port to the output port and to variably control the flow of the working fluid from the output port to the input port; and a spool including a second throttling part to variably control the flow of the working fluid from the output port to the input port through the check valve which is opened for changeover.
Inventors:
KU BON SEUK (KR)
Application Number:
PCT/KR2010/003096
Publication Date:
November 24, 2011
Filing Date:
May 17, 2010
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
KU BON SEUK (KR)
KU BON SEUK (KR)
International Classes:
F15B13/043; E02F9/22; F16K15/00
Foreign References:
| KR100800081B1 | 2008-02-01 | |||
| KR100813559B1 | 2008-03-18 | |||
| KR20080077007A | 2008-08-20 | |||
| KR20080055873A | 2008-06-19 |
Other References:
See also references of EP 2573407A4
None
None
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
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Claims:
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