Title:
SPOOL VALVE AND HYDRAULIC APPARATUS INCLUDING THE SAME
Document Type and Number:
WIPO Patent Application WO/2020/241936
Kind Code:
A1
Abstract:
A spool valve. A valve housing has a pilot fluid passage, and a first portion and a second portion lengthwisely spaced apart from each other. A spool is movably inserted in the valve housing, and includes a plug able to enter the pilot fluid passage between the first portion and the second portion to change a flow area of the pilot fluid passage following movement of the spool. A hydraulic machine. When pilot fluid is supplied to the pilot fluid passage through the first portion, at least a portion of the supplied pilot fluid is provided to the holding valve through the second portion. The holding valve allows a flow of working fluid from the first chamber to the spool valve, and the spool moves to a third position to forward working fluid to the second chamber, and receives working fluid from the first chamber.
Inventors:
KANG MINHEUK (KR)
Application Number:
PCT/KR2019/006540
Publication Date:
December 03, 2020
Filing Date:
May 30, 2019
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
KANG MINHEUK (KR)
KANG MINHEUK (KR)
International Classes:
F16K27/04; F15B13/04; F16K27/12
Foreign References:
| US20090145123A1 | 2009-06-11 | |||
| KR20100039725A | 2010-04-16 | |||
| EP0831181A1 | 1998-03-25 | |||
| KR200221599Y1 | 2001-11-30 | |||
| US4238112A | 1980-12-09 |
Other References:
See also references of EP 3976998A4
Attorney, Agent or Firm:
KIM, Seon-Min (KR)
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