Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Patent
1984-10-09
1986-01-28
Garrett, Robert E.
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
91 29, 91 31, 91516, F15B 1306
Patent
active
045664773
ABSTRACT:
An apparatus for controlling fluid flow to a steering motor and an auxiliary apparatus is capable of smoothly changing between conditions in which it directs relatively small and relatively large flows of fluid to the auxiliary apparatus. The apparatus includes a priority valve assembly having a valve member positioned in accordance with variations in the demand for steering fluid. A land on the valve member cooperates with a fixed valve surface to form a variable size orifice through which fluid flows to a steering controller. A second land on the valve member cooperates with a fixed valve surface to form a variable size main auxiliary flow control orifice through which all of the fluid flow to the auxiliary apparatus is directed during relatively low fluid flow rates to the auxiliary apparatus. A third land on the valve member cooperates with a fixed valve surface to form a second variable size flow control orifice through which additional fluid flow is directed to the auxiliary apparatus during relatively high fluid flow rates to the auxiliary apparatus.
REFERENCES:
patent: 3279558 (1966-10-01), Allen et al.
patent: 3916932 (1975-11-01), Thorson
patent: 4043419 (1977-08-01), Larson et al.
patent: 4253382 (1981-03-01), Yip
patent: 4254687 (1981-03-01), Alexander
patent: 4385674 (1983-05-01), Presley
patent: 4488569 (1984-12-01), Rau
Drawings from U.S. Patent Application Ser. No. 243,497, filed Mar. 13, 1981, by Jim L. Rau and Ronald L. LaHue, entitled "Hydrostatic Load-Sense System".
Barker Charles A.
Rau Jim L.
Garrett Robert E.
Meyer Richard S.
TRW Inc.
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