Frostproof hydrant seal
US5740831A · kind A · utility
32Cited by
44References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Dec 31, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/88054
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A sillcock which has freeze resistance, backflow contamination resistance and back pressure release from the downstream water, having a resilient, radially compressible and expandable back pressure seal valve which is also axially movable a controlled amount to thereby cover or uncover an inner vent hole between the water passage and a vent passage, to allow pressure release from the water flow passage to the atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.