... normal combustion of burner must have a constant air/fuel ratio. The air/gas proportioning valve GIK is used to achieve a constant ... to natural gas, LPG (gas), town gas, also apply to air;Air control pressure: 0.5 - 120mbar. Outlet pressure: 0.2 - 119mbar; ... C.Horizontal installation, spring cavity must face down. For proportioning valve with flanges, a feedback pipe must be installed from the ...