Fail-safe gas valve system with solid-state drive circuit
US6050281A · kind A · utility
45Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87917
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A solid-state fail safe gas valve system in which first and second gas valves are arranged in series in a gas passageway, the valves being actuatable by first and second solenoid operators respectively, the second operator requiring a voltage greater than the operating voltage supplied to the valve system to achieve actuation. The operators are separately energized through microprocessor controlled switches so that a capacitor connected across the second operator and its switch is pumped to a voltage above the supplied voltage by voltage induced by interrupted energization of the first operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.