On-off sprinkler
USRE29155E · kind E · reissue
4Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1975 |
| Grant date | Mar 22, 1977 |
| Priority date | — |
| Expiry date | Sep 3, 1995 |
Classification
- Technology area (CPC —)General
Abstract
An improved sprinkler for a fire protection sprinkler system in which the sprinkler opens to discharge water at one temperature and closes to stop the flow of water at a lower temperature. A pilot valve is actuated by a bimetal disc which also resiliently biases the pilot valve in a closed position. The bimetal disc has a snap action resulting in better control of the "on" and "off" temperatures of the sprinkler. A thermal delay for closing is obtained by the hysteresis which is designed into the bimetal disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.