Stephen B Currey

US Patent:

58486127, Dec 15, 1998

Filed:

Nov 25, 1997

Appl. No.:

8/978500

Inventors:

Stephen B. Currey - Tucson AZ

Assignee:

Sargent Controls & Aerospace/Dover Diversified Inc. - Tucson AZ

International Classification:

F15B 1343

US Classification:

13762563

Abstract:

The invention is a mechanical-type position-sensing and feedback system employed between a main stage spool valve and a pilot stage spool valve of an electro-hydraulic servovalve. The feedback mechanism makes use of a rotatable feedback link that directly senses the position of the slide of the main stage valve and transforms a linear motion of the slide into a linear movement of the sleeve of the pilot stage valve. The feedback link has an elongated body and is adapted for rotation about its body's longitudinal axis.

US Patent:

55730361, Nov 12, 1996

Filed:

Jan 11, 1996

Appl. No.:

8/585360

Inventors:

Don B. Porter - Avra Valley AZ
Stephen B. Currey - Tucson AZ

Assignee:

Sargent Controls & Aerospace/Dover Diversified Inc. - Tucson AZ

International Classification:

F15B 13043

US Classification:

13762563

Abstract:

The invention is a multi-stage electro-hydraulic servovalve having a mechanical feedback between the valve's main and pilot stages. The feedback mechanism makes use of an interconnected set of linkages that transform a linear motion of the main stage slide into a rotative movement of a torque rod that can produce a translation of the pilot stage slide. Many of the linkages of the feedback mechanism are located exterior to the valve's fluid boundary and feature readily adjustable connections through which a user can adjust various parameters of the feedback such as the degree of gain and null point.