Power plants – Pressure fluid source and motor – Full range correspondence of position of external...
Patent
1977-03-14
1978-05-09
Cohan, Alan
Power plants
Pressure fluid source and motor
Full range correspondence of position of external...
60433, 13762569, 13762534, F16B 900
Patent
active
040879674
ABSTRACT:
A valve having a body with two ports and a bore, a sleeve selectively movable within said bore and having two radially extending passages adapted for sequential communication with one of said ports upon movement of said sleeve, and a spool selectively movable within said sleeve and including a land to restrict fluid flow in said passages. The valve is used as a variable pressure control valve in a closed loop hydrostatic circuit to control the displacement of a variable displacement pump. The spool is actuated in response to a pressure difference between the high pressure and the low pressure lines of the circuit. The sleeve is manually movable. A charge pump is provided to provide control fluid to one of the ports of the valve whereby movement of the sleeve and spool within the body will result in the flow of fluid from the charge pump to one servo of the variable displacement pump and from the other servo to drain. The sleeve is provided with a set of passages having a plurality of axially spaced radially extending passages adapted for sequential communication with one of the body ports. The passages within the sleeve are constructed to provide different flow rates for fluid when they are respectively aligned with the port.
REFERENCES:
patent: 3166891 (1965-01-01), Weisenback
patent: 3238723 (1966-03-01), Young
patent: 3696836 (1972-10-01), Bauer
Cohan Alan
Eaton Corporation
McCloskey Robert J.
Yakimow John W.
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