Fail-safe actuator for rotary valves
US4533114A · kind A · utility
38Cited by
20References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1983 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Feb 8, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1819
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An actuator for a rotary valve includes a fail-safe mechanism for automatically opening or closing the valve upon the occurrence of a predetermined condition. The actuator also includes a mechanism for permitting the manual operation of the valve from the open to closed position, and vice versa, and to a continuum of positions between the open and closed positions even when the fail-safe mechanism is activated. A biased clutch activates the fail-safe mechanism and also couples a worm-gear drive for effecting the manual operation of the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.