Monarch 7.00GPH, ugello 45PLP

An oil nozzle is a precision consumable part located between the oil pump and the combustion head. Its function is to atomise the fuel oil into a fine spray cone so that it mixes with combustion air and burns completely. The spray characteristics—flow rate, spray angle, and pattern—directly determine how the flame fits within the combustion head. For a replacement to be reliable, all three parameters must match the burner data plate. A nozzle with the correct flow rate but the wrong pattern can cause sooting, pulsation, or unstable ignition, while an incorrect angle may produce a flame that impinges on the blast tube or heat exchanger. Monarch oil nozzles of this type are selected by the rating in US gallons per hour at the reference pressure, the spray angle in degrees, and the pattern designation. The article listed here is a Monarch 7.00GPH, 45PLP nozzle. That means it is rated for a flow of 7.00 US GPH, has a spray angle of 45 degrees, and carries the PLP pattern code. When replacing a nozzle, check that the existing burner data plate specifies these same three values. Also verify that the thread size and the required operating pressure match the burner pump. Nozzles are not interchangeable across different ratings and patterns, even if they share the same thread and brand.