Fluid controller and improved check valve arrangement therefor

Details Fluid controller and improved check valve arrangement therefor Fluid controller and improved check valve arrangement therefor

1991-09-30

1992-04-07

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91436, 91467, F15B 1304

Patent

active

051018608

ABSTRACT:
A fluid controller (15) is disclosed of the type including a primary, spool valve (41) and a rotatable follow-up valve member (43). The controller includes a housing (23) defining an inlet port (31), a return port (33), and control fluid ports (35 and 37). The return port is in communication with an interior chamber (33c) disposed within the spool valve (41). The controller is of the type including a fluid meter (21) through which the fluid flows as part of the main fluid path, imparting the follow-up movement to the follow-up valve member (43). Anti-cavitation check valves (95L, 95R) are disposed in the spool valve, and permit direct communication from the interior chamber of the spool into the main fluid path when the valving returns to neutral (FIGS. 3 and 5) after cavitation occurs. In addition, manual steering check valves (97L, 97R) are disposed in the spool valve, and are operable to communicate fluid from the interior chamber to the inlet side of the fluid meter when the valving is at maximum displacement, in a manual steering operation (FIGS. 4 and 6).

REFERENCES:
patent: Re25126 (1962-02-01), Charlson
patent: 3443586 (1969-05-01), Christensen
patent: 4159723 (1979-07-01), Baatrup et al.
patent: 4311171 (1982-01-01), Roberts
patent: 4362479 (1982-12-01), Pahl

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