Valve arrangement and traffic calming device incorporating such an arrangement
US6726399B2 · kind B2 · utility
7Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2002 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Nov 26, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01F9/529
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A reactive speed hump (2) includes a fluid flow control valve assembly (4). A first valve (18, 20, 21) is naturally open and a second valve (10, 14, 15, 16, 17), naturally closed. Application of fluid pressure on the control valve assembly below a first lower threshold level or above a second higher threshold level allows a flow of fluid from the inlet to the outlet, but an application of fluid pressure on the control valve between said first and second threshold levels allows substantially no fluid to flow between the inlet (7) and the outlet (9).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.