Title: Four position valve assembly

Abstract: A hydraulic power circuit for operating hydraulic motors at several speeds includes first and second fluid sources and a valve assembly for combining flow from the second source with flow from the first source as a faster motor speed is required. The valve assembly includes a first valve controlling the flow of fluid from the first source to the motors while a slow motor speed is required. The valve assembly also includes a fluid actuated valve controlling the flow of fluid from the second source to the motors as a faster motor speed is required. The fluid actuated valve is actuated by flow from the first source through metering ducts. Once the fluid actuated valve is actuated, fluid from the second source is mixed with fluid from the first source and the valve assembly communicates the increased flow to the motors thus obtaining a faster motor speed.

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Inventors: Hubbard, Glenn R. (Racine, WI, US)

Application Number: 689573
Filing Date: 1976-05-24
Publication_date: 1978-05-16
Assignee: Webster Electric Company, Inc. (Racine, WI)
Primary Class(es): 60/486 91/32, 91/461
Other Classes:
US Patent Ref:

2391930	Jan, 1946	Stone	91/29.
2995012	Aug, 1961	Cassaday	60/486.
3776098	Dec, 1973	Behrens	91/29.
3811282	May, 1974	Schexnayder	60/421.
3949783	Apr, 1976	Plate	60/486.
3975909	Aug, 1976	McBurnett	60/486.

Other Refs: 2,308,810

Feb, 1973	DT

Primary Examiner: Schwadron, Martin P.
Assistant Examiner: Hershkovitz, Abraham
Attorney: Mason, Kolehmainen, Rathburn & Wyss