Control systems for gaseous fuel fired appliances
US3938935A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1973 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Nov 19, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86984
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A control unit for a gas-fired appliance comprises a service tap that acts also as a flame failure device. The flame failure device controls gas flow to a gas governor which is an integral part of the unit and associated with the gas governor is a low gas pressure cut-off. The unit also incorporates a modulating gas flow control valve operatively coupled to a thermostat which, in the case of a gas-fired water heater, is responsive to water temperature in the heater. When used with a water heater, the unit also includes a further thermostat set to terminate gas flow in the event that a predetermined maximum water temperature is exceeded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.