Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1975-04-14
1976-08-31
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
60445, 91446, 91464, 1371163, 137495, F15B 1304
Patent
active
039774244
ABSTRACT:
An improved differential pressure regulator valve for a hydrostatic transmission control system wherein the valve regulates high fluid pressure versus low fluid pressure and produces a pressure differential that in turn controls the transmission. The regulator valve includes a valve body whose bore is in communication with both first and second sets of fluid inlet and outlet ports, with the valve bore containing a spool assembly that includes first and second cooperating spool members, with the second spool member being operable to control the fluid flow between the first inlet and outlet ports or the second inlet port and the first outlet port. Means, including a passage connecting the first outlet port with a spool port, fluidly unbalances the second spool member by applying the pressure of fluid in the first outlet port to one end of the second spool member in opposition to the biasing action of a regulating spring. Further means, including a passageway in the valve body that connects the second outlet port with the other end of the second spool member, fluidly unbalances the second spool member by applying the pressure of fluid in the second outlet port to the other end of the second spool member in addition to the biasing force of the regulating spring. Additional means are utilized for biasing the first spool member toward one of two extreme positions.
REFERENCES:
patent: 3143127 (1964-08-01), Frost
patent: 3339672 (1967-09-01), Crandall
patent: R28113 (1974-08-01), Howard et al.
Clark Equipment Company
Cohan Alan
Michalsky Gerald A.
Ruf Ernst H.
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