Micro Ratio Valves are products of ingenuity and brilliance. The Micro ratio valves are often utilized for air,gas and oil proportioning control. This gas valve is of the highest quality in terms of functionality and reliability. Oil and Gas Valve assemblies have a multiple screw cam assembly. This oil flow valve's assembly provides mechanical adjustment capabilities to the air/fuel ratio at each valve position throughout the entire capacity range of your burner system. A must have in many if not all industrial facilities and and machines. A true wonder of modern engineering and the industrial world The Micro Ratio Valves.