Fail safe apparatus for a direct-drive servovalve

Details Fail safe apparatus for a direct-drive servovalve Fail safe apparatus for a direct-drive servovalve

2005-08-02

2005-08-02

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C137S624270

Reexamination Certificate

active

06923212

ABSTRACT:
Provided is a servovalve system having a fail safe apparatus adapted for switching the servovalve system between an operating position and a fail safe position. The servovalve system comprises a housing having a housing bore and a housing chamber, a spool moveably disposed within the housing, and a stepper motor connected to the spool and configured to vary the spool position for manipulating the fluid flowing within a fluid circuit when the servovalve system is placed in the operating position. A rotary-linear converter converts rotational motion of the stepper motor into axial motion of the spool. The fail safe apparatus includes a piston slidably sealed within the housing chamber and mechanically coupled to the rotary-linear converter. The piston is operative to move the spool from the operating position to the fail safe position upon a loss of fluid pressure in the housing chamber.

REFERENCES:
patent: 4190081 (1980-02-01), Coles
patent: 2005/0000580 (2005-01-01), Tranovich et al.

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