Motors: expansible chamber type – With motive fluid valve – Expanding chamber inlet controlled by contracting chamber...
Patent
1994-04-18
1995-05-16
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Expanding chamber inlet controlled by contracting chamber...
91436, 91439, 91440, F15B 1108, F15B 1304
Patent
active
054150760
ABSTRACT:
Fluid regeneration circuits are useful for filling expanding sides of a hydraulic cylinder with fluid being exhausted from the other side. The currently available circuits pass the excess fluid not needed for filling the expanded side of the cylinder through the directional control valve to the tank such that the directional control valve must be actuated for the regeneration valve assembly to function. A combined meter-out and regeneration valve assembly of the present invention is used in a hydraulic system having a directional control valve for metering in pump to cylinder fluid flow and includes a meter-out valve to meter-out cylinder to tank fluid flow from a head end actuating chamber. The fluid passing through the meter-out valve passes through an exhaust conduit to a tank bypassing the directional control valve. This permits the meter-out valve to be used independently of the directional control valve to retract a hydraulic cylinder. A flow regeneration valve and a pressure boost valve are used in combination with the meter-out valve for providing flow regeneration from the head end chamber to a rod end chamber when fluid pressure in the head end chamber is less than the pressure level of fluid in a passage as determined by a spring of the pressure boost valve.
REFERENCES:
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patent: 5220862 (1993-06-01), Schexnayder
patent: 5287794 (1994-02-01), Anderson
Krone John J.
Yoshino Kazunori
Caterpillar Inc.
Grant John W.
Look Edward K.
Nguyen Hoang
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