Determining valve position
US4468559A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Apr 7, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.