Double check valve having floating function

Details Double check valve having floating function Double check valve having floating function

2011-08-23

2011-08-23

Lazo, Thomas E (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Independent control of bypass between opposed working chambers

C091S447000, C091S464000

Reexamination Certificate

active

08001882

ABSTRACT:
A double check valve having a floating function is disclosed, which can prevent construction equipment from overturning through intercepting of a floating function even if a signal pressure is fed to the double check valve to perform the floating function in a state that an excavator is supported by a working device (e.g. a dozer blade), i.e. in a jack-up state, on a sloping site and so on. The double check valve includes a hydraulic pump; a hydraulic cylinder connected to the hydraulic pump to operate a working device; a control valve installed in flow paths between the hydraulic pump and the hydraulic cylinder, and shifted to control a start, a stop, and a direction change of the hydraulic cylinder; and a double check valve installed in flow paths between the control valve and the hydraulic cylinder, and including a pair of plungers having first diaphragms formed thereon to receive an operating pressure being applied to the hydraulic cylinder and second diaphragms formed thereon to receive a signal pressure being applied to the signal pressure flow path, and a pair of check valves being pressed to remove their check function through shifting of the plungers. Sectional areas of the first diaphragms and the second diaphragms are different from each other.

REFERENCES:
patent: 3274902 (1966-09-01), Kleckner
patent: 3908515 (1975-09-01), Johnson
patent: 4286432 (1981-09-01), Burrows et al.
patent: 5036750 (1991-08-01), Katayama
patent: 6997210 (2006-02-01), Horn et al.
patent: 2008/0121101 (2008-05-01), Park

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