Fluid handling – Systems – Multi-way valve unit
Patent
1983-09-01
1986-01-21
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762418, 25112910, F15B 13044
Patent
active
045652198
ABSTRACT:
A multiple-position solenoid-operated control valve having a valving member in the form of a spool fitted in a valve body so that it is normally held at its normal position by a first spring and slidably movable at least to two or more operated positions on one side of the normal position. The spool is moved by a movable iron core upon energization of a solenoid which produces actuating forces of different magnitudes increasing in at least two steps including a first operating force to move the spool to the first operated position against a first biasing force of the first spring, and a second operating force greater than the first operating force. At least a second spring is provided to cooperate with the first spring to hold the spool at the first operated position against the first operating force until the second operating force is produced. The second spring producing a second biasing force which is greater than a difference between the first operating force and the first biasing force and smaller than a difference between the second operating force and the first biasing force. The valve may comprise an adjusting mechanism for changing the first operated position of the spool with respect to its normal position.
REFERENCES:
patent: 2436992 (1948-03-01), Ernst
patent: 2910089 (1959-10-01), Yarber
patent: 3967648 (1976-07-01), Tirelli
patent: 4194719 (1980-03-01), Ewald et al.
patent: 4342443 (1982-08-01), Wakeman
patent: 4422475 (1983-12-01), Aspinwall
Michalsky Gerald A.
The Oilgear Japan Company
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