RFG - Liquid fuels pressure regulator

Description

The RFG Series light Oil pressure Regulators are precision devices designed for use in modulating oil burners, ensuring an accurate and consistent oil‑to‑air ratio across all firing ranges. Built with robust materials—including an AVP body, C40 shutter seat, AISI303 valve stem, and reinforced rubberized diaphragm—they provide durability and performance under demanding industrial conditions. These regulators operate with a maximum inlet pressure of 7 bar, a maximum differential pressure of 0.7 bar, and maintain efficient functionality up to 80 °C and viscosities up to 3°E.

Their working principle is based on proportional control: the combustion air flow generates a pressure signal applied to the regulator diaphragm, which modulates the outlet oil pressure. During setup, operators adjust the oil flow to match burner air requirements, and the regulator maintains this ratio automatically during operation. The design achieves a 10:1 turndown ratio by adjusting the combustion air valve, making the system well‑suited for processes requiring precise temperature or pressure control.

Because the regulator’s diaphragm surface area is thirty times larger than the oil piston area, it produces an outlet pressure thirty times the applied air pressure. This ensures a stable and repeatable oil flow, provided the inlet oil pressure remains constant—variations of 0.35 bar can introduce a 2% error.

Installation guidelines recommend mounting the unit horizontally with the adjustment stem facing downward, ensuring proper flow direction as indicated on the body. A filter must be installed upstream to prevent clogging, and the regulator should ideally be placed at the same level as the burner to maintain accuracy. For multi‑level installations, separate regulators should be used for each level. Avoiding long oil lines between the regulator and the burner further enhances performance and stability.