Enhanced backflow prevention apparatus and method
US6792962B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Jan 7, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/3331
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A backflow prevention apparatus and method are provided for use in irrigation systems. An anti-siphoning device may have a housing, a plunger, a plunger retainer, and a cap. The housing has inlet and outlet channels formed therein, with the outlet channel running through the interior of the inlet channel. The plunger has a generally annular shape and is disposed to block water flow from the outlet channel into the inlet channel, but to allow flow from the inlet channel to the outlet channel. When the inlet channel is closed, the plunger permits air to flow into the outlet through the cap, the plunger retainer, and a central opening formed in the plunger. The plunger may have an elastomeric exterior to provide a more effective seal between the plunger and the inlet channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.