Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Reexamination Certificate
2005-06-21
2005-06-21
Look, Edward K. (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
C091S442000
Reexamination Certificate
active
06907815
ABSTRACT:
The present invention relates to a control apparatus of a hydraulic valve for holding load in which a drain line of a holding valve adapted to preclude momentary drop of load in a hydraulic actuator is substituted with a path in the interior of a directional control valve, so that a pipe line of a drain side functioning as a hydraulic hose and exposed to the outside is not needed in the present invention. The control apparatus of a hydraulic valve for holding load comprises a drain line adapted to allow hydraulic fluid returned during a switching operation of the sub-spool to flow in a pilot line of the side of a drain corresponding to the opposite side of a pilot line adapted to pressurize the spool of the directional control valve.
REFERENCES:
patent: 3943825 (1976-03-01), Bianchetta et al.
patent: 4417502 (1983-11-01), Shore
patent: 6186044 (2001-02-01), Hajek, Jr. et al.
patent: 6691510 (2004-02-01), Kariya et al.
patent: 10047632 (2002-04-01), None
patent: 1211359 (2002-06-01), None
Ladas & Parry LLP
Leslie Michael
Volvo Construction Equipment + Holding Sweden AB
LandOfFree
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