Magnetostrictively actuated valve

Details Magnetostrictively actuated valve Magnetostrictively actuated valve

1994-09-21

1996-03-26

Schwadron, Martin P.

Valves and valve actuation

Electrically actuated valve

Including solenoid

25112901, F16K 3106

Patent

active

055014259

ABSTRACT:
A valve for fail-safe return to its normally closed condition relies upon solenoid-driven elongation of a magnetostrictive core element, for opening displacement of a valve member, and also relies upon a continuously available, stiffly compliant preload of the valve member into its position of lock-up at valve closure. The currently preferred material of the core is Terfenol-D, which offers a strong elongation response to inductively coupled excitation. The elongation response is sufficient to serve the purposes of driving a poppet-valve member from closed to open position, with a relatively short time constant, as well as to permit a closed condition of the valve wherein the driving end of the core is effectively disconnected from the poppet-valve member, so that the prestressed stiff compliance can alone be operative on the poppet-valve member for fail-safe closure of the valve.

REFERENCES:
patent: 3814376 (1974-06-01), Reinicke
patent: 4553735 (1985-11-01), Brundage
patent: 4756331 (1988-07-01), Stegmaier
patent: 4890815 (1990-01-01), Hascher-Reichl et al.
patent: 5218999 (1993-06-01), Tanimoto
patent: 5375811 (1994-12-01), Reinicke

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