Fluid flow system vacuum breaker
US5329957A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Dec 15, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86549
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid flow system (20) includes fluid inlet conduits for supplying fluid through a fluid flow path (86) as formed by a manifold (74) and a module (76). The fluid is directed through fluid flow path (86) to a flexible conduit (54) and to a fluid dispensing wand (36) whereat the fluid can be selectively dispensed in a stream or a spray. A linking passageway (102) is formed by manifold (74) and module (76) to couple selectively the pressure of a pressurized environment, such as atmospheric pressure, to fluid flow path (86). An umbrella valve (104) is located in linking passageway (102) and is responsive to the development of a negative pressure at the fluid supply and thereafter couples the pressure of the pressurized environment to fluid flow path (86). This action neutralizes the effects of the negative pressure and precludes the reverse flow of fluid within fluid flow system (20).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.