Steering controller with integral parallel control

Details Steering controller with integral parallel control Steering controller with integral parallel control

1990-04-23

1991-05-21

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91 32, 91467, 137596, F15B 1304

Patent

active

050166727

ABSTRACT:
A fluid controller (11) is provided of the type including a primary, rotatable spool valve (35) and a relatively rotatable follow-up sleeve valve (37). The spool and sleeve define a main fluid path in response to relative rotation, the main fluid path including flow through a fluid meter (17). In accordance with the invention, the spool and sleeve are also moveable axailly relative to each other to define a separate fluid path, in parallel with the main fluid path, the parallel fluid path preferrably excluding the fluid meter (17). Axial actuation of the spool and sleeve relative to each other may be accomplished by controlling fluid pressure in a pair of axial fluid chambers (69, 83). The control of the fluid pressure may be accomplished by any suitable electrohydraulic means (95) or hydromechanical means (181).

REFERENCES:
patent: Re25126 (1962-02-01), Charlson
patent: 2833253 (1958-05-01), Wittren
patent: 3385057 (1968-05-01), Pruvot et al.
patent: 3584538 (1971-06-01), Petersen
patent: 3937601 (1976-02-01), Miller
patent: 4033377 (1977-07-01), Johnson
patent: 4237773 (1980-12-01), Liebert et al.
patent: 4838375 (1989-06-01), Nagai

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