Vapor recovery fuel dispensing nozzle
US5255723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Aug 24, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB67D2007/545
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A fuel dispensing nozzle includes a nozzle body and a projecting spout and surrounding bellows which define a fuel supply passage and a vapor return passage connected to corresponding concentric passages within flexible coaxial hoses. The body supports a manually actuated control valve within the fuel passage, and a pressure responsive check valve is also located within the fuel passage adjacent the spout. The check valve includes a valve member normally biased against a tapered valve seat, and a first venturi suction passage extends from the valve seat to control a pressure responsive diaphragm mechanism for automatically closing the manually actuated valve when fuel blocks a suction vent line within the of the spout. A second venturi suction passage extends from the valve seat through the nozzle body and connects with a fuel evacuation passage within a flexible tube which extends downwardly into the vapor passage within the coaxial hoses. The vapor return passage within the nozzle body is normally closed by a spring biased valve member which opens in response to collapsing of the bellows, and excessive vapor pressure within the vapor passage also operates the diaphragm mechanism …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.