Balanced-flow gas safety valve
US5551476A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Jan 5, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7869
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gas line limiter valve is preferably built into a stiffener used to connect gas lines. The valve includes a through-passage having a large bore and a small bore downstream from the large bore, with a conical valve seat between. A central reservoir may be disposed between the large and small bores. A movable float includes a piston disposed within the large bore, a stem disposed within the small bore, and a popper to seal against the valve seat when the float is moved downstream. A coil spring urges the float upstream. The stem and the piston are cylindrical. The piston and large bore form a first orifice, and the stem and small bore form a second orifice. With the second orifice being smaller than the first, the second orifice and the buffer gas inside the reservoir create a resistance to the valve closing during sudden temporary drops in the downstream pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.