Slow close hydrant check valve
US4127142A · kind A · utility
34Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | May 11, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8158
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wet barrel hydrant check valve has a body containing a dash-pot assembly connected to a flapper valve, spring biased towards the closed condition. A sandwich flange fixed to the hydrant has a member holding the flapper out of the flow passageway, the flange being joined in a break-away connection to the valve body so that upon hydrant upset, as by vehicle impact, the hydrant and holding member are dismounted from the valve body, releasing the flapper into the flow path of escaping water for dash-pot controlled, gradual closure of the valve minimizing water hammer in the line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.