Hydraulic control valve having a centering spring device

Fluid handling – Systems – Multi-way valve unit

Patent

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Details

13762565, 251337, F15B 1304

Patent

active

053160444

ABSTRACT:
Centering spring devices are useful in hydraulic control valves for returning the valve to the neutral position under both normal and abnormal operating conditions. Since the actuator moving the valve spool must work against the spring centering device, electrically actuated hydraulic valves have been limited to small sizes. The subject hydraulic control valve incorporates a centering spring device that can be controllably disabled so that the valve spool can be freely moved between the neutral and operating positions. In one embodiment, a centering spring is disabled by hydraulically moving the spring retainers toward each other to compress the spring with hydraulic fluid controlled by a solenoid valve. Maintaining the spring in a compressed condition permits the valve spool to be moved with a smaller actuator thereby making it feasible to control the valve position with an electrical actuator.

REFERENCES:
patent: 3434390 (1969-03-01), Weiss
patent: 3502109 (1970-03-01), Straight
patent: 3511276 (1970-05-01), Jessen et al.
patent: 3640146 (1972-02-01), Barnes
patent: 4041983 (1977-08-01), Bianchetta
patent: 4046165 (1977-09-01), Rose et al.
patent: 4185660 (1980-01-01), Faix
patent: 4195551 (1980-04-01), Schmiel
patent: 4328950 (1982-05-01), Aspinwall
patent: 5079920 (1992-01-01), Whitehead et al.

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