Fluid handling – Pressure modulating relays or followers
Patent
1995-02-21
1997-05-20
Michalsky, Gerald A.
Fluid handling
Pressure modulating relays or followers
137554, 25112906, F15B 13044, F16K 3102
Patent
active
056304404
ABSTRACT:
A piezo-electrically actuated hydraulic valve has a nozzle type seat and a piezo-electric actuator in a plane orthogonal to the axis of the nozzle. The actuator includes a piezo-ceramic layer laminated to an electrode sheet, so that the composite is in sheet form and parallel to the plane of the seat. 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 over the seat, and in the preferred embodiment normally closes the seat. When an electric field is applied to the piezo-ceramic layer, the actuator bows or dishes so as to displace relative to the nozzle. The electric field may be applied proportionally, in which case the actuator displaces proportionally to the field applied, the field may be applied as a pulse width modulated signal, in which case the displacement of the actuator also modulates. The actuator has an electrode coating applied over the ceramic layer, which may be divided into motor and generator sub-areas, and an area of the coating is absent where the ceramic layer seats against the nozzle. Rectangular and circular actuators are disclosed.
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Applicant's 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, (Undated).
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, (Undated).
Knutson Dale A.
Steber George R.
Applied Power Inc.
Michalsky Gerald A.
LandOfFree
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