Self-draining backflow prevention valve
US4976279A · kind A · utility
34Cited by
9References
13Claims
0Family size
Inventors
Key dates
| Filing date | Nov 20, 1989 |
| Grant date | Dec 11, 1990 |
| Priority date | — |
| Expiry date | Nov 20, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7842
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention comprises an automatic self-draining backflow prevention valve having an internal cylindrical resilient sleeve that expands or contracts in response to water pressure to coact with a two way valve that provides for automatic self-draining of both the water faucet and the backflow prevention valve when the water faucet is shut off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.