Apparatus for determining the position of a rotary valve

Details Apparatus for determining the position of a rotary valve Apparatus for determining the position of a rotary valve

1998-03-02

2000-04-04

Hirshfeld, Andrew H.

Signals and indicators

Indicators

Valve position

116DIG21, 340672, 3406861, F16K 3700

Patent

active

060447915

ABSTRACT:
A position indicator for a rotary valve actuator has a stator of one color mountable on a housing for the actuator and a rotor of a contrasting color which is connected to the actuator output shaft for rotation with it. The rotor has inner and outer coaxial cylindrical walls with windows in the outer wall. The stator has a hollow cylindrical wall in the space between the rotor walls. When the windows of the rotor and stator are in registration the inner wall of the rotor is visible and the stator is hidden to indicate one position of the actuator output shaft. When the windows of the rotor and stator are out of registration the inner wall of the rotor is hidden by the stator wall which is visible through the rotor window to indicate another position of the actuator output shaft. A circuit actuator and sensor may be mounted on the rotor and stator for generating electrical signals indicative of the actuator output shaft position in addition to the visual indication.

REFERENCES:
patent: 4494566 (1985-01-01), Sinclair et al.
patent: 4690168 (1987-09-01), Kihm
patent: 4718445 (1988-01-01), Lundberg et al.
patent: 5223822 (1993-06-01), Stommes et al.
patent: 5278530 (1994-01-01), Zovath
patent: 5469805 (1995-11-01), Gibbs
patent: 5535698 (1996-07-01), Trevisan
patent: 5623963 (1997-04-01), Stommes et al.

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