Fluid controller with load sensing priority flow control capabil

Details Fluid controller with load sensing priority flow control capabil Fluid controller with load sensing priority flow control capabil

1991-03-07

1991-11-19

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91467, 91516, 13759613, F15B 1306

Patent

active

050657933

ABSTRACT:
A fluid controller (15) is provided of the type which controls the flow of fluid from a source (11) to a priority device (19) and an auxiliary device (21). The controller includes a valving arrangement (33) comprising a primary, rotatable spool valve (51), and a cooperating, relatively rotatable follow-up sleeve valve member (53). The spool and sleeve cooperate to define controller valving (35) while the sleeve and housing cooperate to define load sensing, priority flow control valving (37). In a preferred embodiment, the controller valving is defined by relative rotation between the spool and the sleeve, while the priority flow control valving is defined by relative axial movement between the sleeve and the housing. The axial position of the sleeve is controlled by fluid pressure in a pilot pressure chamber (95), and in a load signal chamber (103), the difference therebetween representing the pressure differential across a main variable flow control orifice (A1) defined by the controller valving (35). With the present invention, load sensing, priority flow control valving is provided without the need for separate valving, external to the controller, and without the need for the associated plumbing.

REFERENCES:
patent: 3455210 (1969-07-01), Allen
patent: 3481147 (1969-12-01), Goff
patent: 3996742 (1976-12-01), Goff
patent: 3996838 (1976-12-01), Goff
patent: 4043419 (1977-08-01), Larson et al.

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