Oil-Air Ratio Regulators are used to proportion fuel flows to modulating oil burners. Combustion air flows produce a proportional pressure signal that is applied to the regulator 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-Air Ratio Regulators have a unique balanced valve design for inlet oil pressure in the 40 psig to 100 psig range. A constant oil pressure is required at the OAR inlet.
Precise control of outlet pressure
Pressure balance system for single valve control
10:1 turndown ranges
40 to 100 psig inlet oil pressures
250°F Maximum Operating Temperature
Balanced valve design
Accurate 30:1 oil to air pressure ratio at all firing rates
Adjustable low fire setting
Designed for continuous service
Rugged, heavy-duty construction
4 OAR 50
3/4 to 50
6 OAR 100
2 to 100
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