Simplified fail-fixed servovalve

Details Simplified fail-fixed servovalve Simplified fail-fixed servovalve

1979-04-23

1981-07-07

Maslousky, Paul E.

Motors: expansible chamber type

Differential

Motive fluid constantly applied to one working member face

91 3, 91459, 91461, F15B 1517, F15B 13044

Patent

active

042768098

ABSTRACT:
A simplified fail-fixed electrohydraulic servovalve for operating with a source of fluid under pressure, and a piston translatably disposed within a bore. The piston has a rod side face area which is less than its head side face area and translates in a first direction for electrical input signals above a first predetermined percent of a maximum rated input signal. At a second percent of the rated input signal, determined by the ratio of the piston rod side face area to the piston head side face area, the piston position is fixed. For electrical input signals greater than the second percent of the rated input signal the piston translates in the second direction. Any input signal below the first percent causes the piston to be fixed in place.

REFERENCES:
patent: 3473547 (1969-10-01), Coakley
patent: 3592211 (1971-07-01), Spalding
patent: 3863547 (1975-02-01), Meier et al.
patent: 3922955 (1975-12-01), Kast
patent: 3969985 (1976-07-01), Grieger et al.

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