Flapper valve

Details Flapper valve Flapper valve

1998-11-25

2000-01-25

Lee, Kevin

Valves and valve actuation

Electrically actuated valve

Having element dimensionally responsive to field

251357, F16K 3102

Patent

active

060170166

ABSTRACT:
A bimorph piezoelectric flapper element is mounted at one end in a valve casing so that it extends into a valve chamber as a cantilever. The flapper element tapers to the unsupported end on which a fluorosilicone blocking plate is mounted. An outlet port is formed by a tubular boss which projects into the valve chamber and which tapers to a fine annular rim formed around a mouth of a bore at the tip of the boss. The blocking plate is normally held by the flapper element seated on the tip of the tubular boss to close the outlet port, the tip making an indentation in the fluorosilicone whereby to form a `bite` seal. The blocking plate is unseated by the application of a low voltage to the bimorph piezoelectric element. The valve is suitable for hydraulic fluids and may be operated by optical power.

REFERENCES:
V.N. Garnov et al., "High-speed Pulsed Valve Based on a Bimorph Piezoelectric Element", Instruments and Experimental Techniques, vol. 23, No. 4, pp. 981-983 (1980).
M. Takenobu, Patent Abstracts of Japan of JP 63 190985, "Normal Open Type Piezoelectric Valve and Driving Method Thereof", (Aug. 8, 1988), (Abstract Only).

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