Magnetically assisted piezo-electric valve actuator

Details Magnetically assisted piezo-electric valve actuator Magnetically assisted piezo-electric valve actuator

1995-02-21

1997-01-14

Nguyen, Hoang

Valves and valve actuation

Electrically actuated valve

Including solenoid

251331, F16K 3102

Patent

active

055931340

ABSTRACT:
A piezo-electrically actuated fluid control valve has a nozzle type seat, a magnet opposite from the seat, and a piezoelectric actuator in sheet form between the seat and magnet. The actuator includes a piezo-ceramic layer laminated to an electrode sheet, so that the composite is parallel to the seat and a surface of the magnet. The electrode sheet has opposite edges which extend beyond the piezo-ceramic layer and are clamped by the housing of the valve so that the center of the actuator is positioned between the seat and magnet. When an electric field is applied to the piezo-ceramic layer, the actuator bows or dishes so as to displace from the seat toward the magnet, and the magnetic field of the magnet draws the actuator further away from the seat, to increase the valve opening between the actuator and the seat. The actuator may be operated by a pulse width modulated or a proportional analog electrical signal, which may be applied in combination with the magnetic field to move the actuator, or if the magnetic field is induced by an electromagnet, electrical and magnetic control modes may be used alternatively.

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Applicant'Exhibit 1, 1 page flyer of Edo Western Corp., Salt Lake City, Utah, entitled "Piezo-Ceramic Monomorph" and identified at the bottom by EWC 01985 7512, admitted prior art (No Date).
Applicant's Exhibit 2, brochure entitled "EDO Corporation Acoustics Division Ceramic Operations Piezoelectric Ceramics, Material Specifications Typical Applications" of EDO Corporation Acoustics Division Ceramic Operations, Salt Lake City, Utah, admitted prior art (No Date).

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