F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
137/37, 158/62
F23N 5/24 (2006.01) G05D 16/06 (2006.01)
Patent
CA 1039145
Abstract of the Disclosure: A valve assembly including a gas valve having first and second redundant valve members which are individually operable to open and close respective inlet and outlet valve ports, and a pressure regulating apparatus interposed between the inlet and outlet valve ports operable to control gas flow to the outlet valve port when the first and second valve members are operated, and a lead detection apparatus for detecting a leak across one of the valve ports, including a pressure diaphragm operated valve which is maintained open responsive to gas flow through both the valve inlet port and the valve outlet port to permit gas flow to an outlet of the valve, the valve being operated to close in the event of gas flow for a predetermined time through only one of the ports indicative of a ?leak con- dition for the port. The valve assembly is disclosed with reference to an application in a fuel ignition system to control gas flow to a pilot burner and a main gas burner and to effect shut down of the system in the event of a leak condition for a pilot gas valve of the assembly.
258737
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