Oil Governors are used to proportion fuel flows to modulating oil burners. Combustion airflows produce a proportional pressure signal that is applied to the governor to set the outlet oil pressure. On initial adjustment the desired oil flow rate is set to match the burner air capacities. The regulator holds this oil to air ratio at all firing rates. Pressure balancing of the oil control system eliminates complicated valve linkages on these burners.
Heat input turndown over a 10 to 1 range is achieved by varying the position of the combustion air control valve. This simple single valve control is readily interlocked with control motors to process temperature, pressure or other functions to provide precisely the heat required at any time. Oil governors have a unique balanced valve design for inlet oil pressure in the40~100 PSIG range. A constant oil pressure is required at the AOR inlet.