Valve position sensor

Details Valve position sensor Valve position sensor

1995-07-12

1997-11-25

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

25055931, G01B 1114

Patent

active

056918135

ABSTRACT:
A position sensor for monitoring the position of the valve element of a valve is described. The sensor comprises reflector means associated with the valve element and arranged to reflect energy, for example visible light, from a suitable source such that when the valve element is in a first position the reflected energy is incident upon a detector. Movement of the valve element away from the first position results in the reflected light no longer being incident upon the detector. The invention further relates to a valve including such a position sensor.

REFERENCES:
patent: 4452074 (1984-06-01), Shelomentsev et al.
patent: 5231469 (1993-07-01), Jeffers et al.

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