Coaxial breakaway coupling with vapor assist check valve
US5615706A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 12, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Jul 12, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87957
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A coaxial breakaway coupling and a coaxial hose connect a fuel dispensing pump to a coaxial fuel dispensing nozzle, and the coupling includes first and second tubular valve bodies releasably coupled together by an annular canted coil spring. Each valve body supports therein an axially movable tubular valve member for defining an inner vapor return passage and an outer fuel supply passage, and a vapor return check valve member is supported for axial movement within the vapor return passage upstream of an annular valve seat. All of the valve members are spring biased towards closed positions and move to open positions when the valve bodies are coupled together. When the valve bodies are uncoupled or separate in response to an axial breakaway force, the valve members close, and suction from a vacuum pump connected to the vapor return passage pulls the check valve member towards it closed position against the valve seat. In a modification, the breakaway coupling is integrated with a 45.degree. coaxial swivel coupling connected to a coaxial fuel dispensing nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.