Actuating drive having a safety device
US5365963A · kind A · utility
8Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1993 |
| Grant date | Nov 22, 1994 |
| Priority date | — |
| Expiry date | Nov 12, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1963
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An actuating drive, particularly for control valves and shut-off valves or the like, comprising a safety device that automatically brings an actuation element into a safety position, particularly a closed position, given a limit temperature that upwardly exceeds the normal temperature range, particularly in case of fire, having a swelling compound that presses the actuation element in the direction toward the safety position when it expands and which multiplies in volume upon formation of cavities when the limit temperature is upwardly exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.