Fluid handling – Systems – Multi-way valve unit
Patent
1992-12-07
1994-05-31
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
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.
Hutchison Eric A.
Mack David C.
Szentes John F.
Zimmermann Daniel E.
Caterpillar Inc.
Grant John W.
Michalsky Gerald A.
LandOfFree
Hydraulic control valve having a centering spring device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control valve having a centering spring device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control valve having a centering spring device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1621852