Two stage spool centering mechanism

Details Two stage spool centering mechanism Two stage spool centering mechanism

2006-11-21

2009-12-15

Lopez, F. Daniel (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Inlet fluid supplemented by controlled fluid pressurized in...

C137S529000

Reexamination Certificate

active

07631591

ABSTRACT:
A valve arrangement includes a spool movable in first and second strokes. A first biasing member has a first spring constant and a first preload, and a second biasing member has a second spring constant lower than the first spring constant and a second preload higher than the first preload. The first biasing member and not the second biasing member biases the spool toward the center position through the entire first stroke and is deflected during movement of the spool from a center position to an intermediate position within the second stroke. The first and second biasing members are deflected during movement of the spool from the intermediate position to an end of the second stroke.

REFERENCES:
patent: 3243025 (1966-03-01), Staab et al.
patent: 3386471 (1968-06-01), King
patent: 3473566 (1969-10-01), Peppel
patent: 3895703 (1975-07-01), Schmitt et al.
patent: 3935792 (1976-02-01), Dezelan et al.
patent: 3990352 (1976-11-01), Nishida et al.
patent: 4013381 (1977-03-01), Hein et al.
patent: 4479514 (1984-10-01), Bennett
patent: 5115722 (1992-05-01), Ichihashi et al.

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