Determining valve position

Details Determining valve position Determining valve position

1982-04-07

1984-08-28

Smith, Alfred E.

Radiant energy

Radiation tracer methods

Radioactive tracer methods

137554, 340686, G21H 502, F16K 3700

Patent

active

044685599

ABSTRACT:
A method and apparatus for determining the position of a valve for example ball valves, plug valves, gate valves using a source of radiation such as cesium-137 located either on or adjacent to the external surface of the valve or within the valve itself, for example in the ball of a ball valve, and a radiation detector such as a Geiger-Muller tube on the external surface of the valve. Source and detector are aligned and located relative to one another so that the count rate detected is indicative of the valve position. The method is accurate and, for example, allows the position of the ball in a ball valve to be monitored to within .+-.1 mm.

REFERENCES:
patent: 2750583 (1956-06-01), McCullough
patent: 3128386 (1964-04-01), Hughes
patent: 3381550 (1968-05-01), Smith
patent: 3602254 (1971-08-01), Fawkes
patent: 4093000 (1978-06-01), Poff

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