Marvin John Graham

US Patent:

42856620, Aug 25, 1981

Filed:

Aug 17, 1978

Appl. No.:

5/934533

Inventors:

Jay R. Katchka - Cypress CA
Marvin M. Graham - Westminster CA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

F23Q 908

US Classification:

431 53

Abstract:

There is disclosed a control system for a gas fired main and pilot burner assembly of an appliance. The assembly comprises first and second serially connected gas control valves for installation in the gas line to the main burner. A bypass conduit is provided downstream of the first control valve communicating with the pilot burner. A flame sensor such as a thermocouple is mounted adjacent the pilot burner for direct contact with the flame therefrom are included in the system. The valve members of each of the first and second control valves are resiliently biased closed and an independent latching mechanism is provided with each valve structure to hold its respective valve member open. The latching mechanism of each valve is operatively interconnected to the flame sensor so that the valve members are latched in the valve open positions when a flame is present at the pilot burner.