| 摘要 |
A method for delivering fuel oil from a pressurized fuel oil source to an airblast atomizer subassembly on a low firing rate fuel oil burner includes providing a flow control device having a body defining a bore extending between and inlet end of the bore and an outlet end of the bore. The flow control device includes a rod disposed coaxially within the bore in a close fitting relationship. At least one of the bore and the rod is threaded (i.e. , includes a groove extending along a helical path) to define a passageway extending along a circuitous, helical path intermediate the input and output ends of the bore through which the fuel oil must pass in flowing from the input e nd to the output end. The passageway has a size and shape adapted to achieve a desired rate of flow of the fuel oil to the airblast atomizer subassembly (e.g., less than 1.0 gallons per hour and typically less than 0.5 gallons per hour) . The method proceeds by delivering the fuel oil through the passageway in the flo w control device. One embodiment of the flow control device has a threaded bore. Another has a threaded rod. Yet another is adapted to attach directly to the atomizer subassembly, while still another has fittings enabling placemen t in a fuel oil line apart from the atomizer subassembly.
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