Valves and valve actuation – Electrically actuated valve
Patent
1995-06-21
1997-09-30
Nguyen, Hoang
Valves and valve actuation
Electrically actuated valve
60516, 60531, F16K 3102, F03C 500
Patent
active
056719051
ABSTRACT:
A new and improved electrochemical actuator and method of using it enables a reversible electrochemical generation of gases for inducing a phase/volume change that can produce high actuation forces, long actuation distances, and remain at the last pressure level attained by current flow even after the power is switched off, enabling a zero power hold at any position. The electrochemical actuator includes an electrolyte solution sealed within a substantially constant volume chamber, having electrical contacts disposed therein such that the electrolyte is in electrical communication with the electrical contacts. Passage of current between the contacts through the electrolyte, separates the electrolyte and or electrode material into its component gas or gases, resulting in an increased pressure within the chamber. This pressure can either act directly upon, or be routed via pneumatic or hydraulic lines, to actuate a diaphragm, move a piston, inflate a bladder, or any other suitable means of converting pressure to motion or displacement. The electrochemical actuator of the present invention can be scaled-up for large scale applications, or down-scaled for micro-miniaturization applications. Because of its low voltage and current requirements, the present electrochemical actuator is fully compatible with modern semiconductor circuits. Furthermore, the electrochemical actuator of the present invention can be operated over a wide temperature range and inexpensively manufactured in large quantities.
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Clarke Richard D.
Nguyen Hoang
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