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07/05/07 | 40 views | #20070154856 | Prev - Next | USPTO Class 431 | About this Page  431 rss/xml feed  monitor keywords

Dual fuel boiler with backflow-preventing valve arrangement

USPTO Application #: 20070154856
Title: Dual fuel boiler with backflow-preventing valve arrangement
Abstract: A dual fuel boiler has fuel delivery apparatus coupled to its burner section through a pressure regulator and operative to deliver to the burner section, from sources thereof, a selectively variable one of (1) a first fuel at a pressure greater than the pressure regulation setting of the pressure regulator, and (2) a second fuel at a pressure less than the pressure regulation setting, the second fuel having a Wobbe index greater that that of the first fuel. The first fuel is flowed to the burner section via a branch supply line in which first and second electromechanical two position, two-way, two position valves are installed in series in opposite normal flow orientations to thereby prevent backflow of the second fuel into the source of the first fuel. (end of abstract)
USPTO Applicaton #: 20070154856 - Class: 431062000 (USPTO)
Related Patent Categories: Combustion, Timer, Programmer, Retarder Or Condition Responsive Control, Of Diverse Feed Or Feed Rate In Starting, E.g., Enriching Fuel Mixture In Starting, Etc.

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