Title:
HYDRAULIC MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/235574
Kind Code:
A1
Abstract:
A hydraulic machine includes an actuator, a tank (40), a directional control valve disposed between the actuator and the tank (40), and an adjustable return check valve (60) disposed between the directional control valve and the tank. The directional control valve includes an attachment actuator directional control valve (21) disposed between an attachment actuator (31) of the actuator and the tank and a swing actuator directional control valve (23) disposed between a swing actuator (33) of the actuator and the tank. The adjustable return check valve allows fluid to flow from the attachment actuator directional control valve toward the tank while applying the low back pressure but blocks a flow, and allows fluid to flow from the swing actuator directional control valve toward the tank while applying the high back pressure but blocks a reverse flow.
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| JPS55166508 | FLUID PRESSURE CIRCUIT |
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Inventors:
KANG MINHEUK (KR)
JEON MANSEUK (KR)
JEON MANSEUK (KR)
Application Number:
PCT/KR2020/006675
Publication Date:
November 25, 2021
Filing Date:
May 22, 2020
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
KANG MINHEUK (KR)
JEON MANSEUK (KR)
KANG MINHEUK (KR)
JEON MANSEUK (KR)
International Classes:
F15B11/16; F15B13/06; F16K15/18; F16K17/02
Foreign References:
| US20030121256A1 | 2003-07-03 | |||
| US5791142A | 1998-08-11 | |||
| EP0331076B1 | 1993-09-15 | |||
| US3878864A | 1975-04-22 | |||
| US6241212B1 | 2001-06-05 |
Other References:
See also references of EP 4153869A4
Attorney, Agent or Firm:
KIM, Seon-Min (KR)
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