Solenoid operated fluid flow control valves

Details Solenoid operated fluid flow control valves Solenoid operated fluid flow control valves

1987-06-08

1988-10-18

Reger, Duane A.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

1376275, 25112921, 303113, B60T 836, F16K 3104

Patent

active

047782277

ABSTRACT:
A solenoid-operated fluid-flow control valve comprising a single solenoid coil, the energization of which controls the movement of first and second armatures which in turn control first and second respective valve members. The armatures are biased away from the solenoid by respective springs, one of which is weaker than the other. When the solenoid is energized by a constant current the armature with the weaker spring is attracted to the end of the solenoid and forms part of a magnetic circuit. This increases the magnetic flux at the other end of the solenoid, allowing the second armature to be drawn to the solenoid sequentially after, and subsequent to, the drawing-in the of the first armature. Particular anti-lock brake systems incorporating the valve are disclosed.

REFERENCES:
patent: 4579146 (1986-04-01), Tsuru et al.
patent: 4655255 (1987-04-01), Rode

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