... , industrial furnace, resident building, medium and low pressure small direct fired equipmentMedianatural gas, manufactured coal gas, LPG, air, Other ... Regulators used indoor, buildings, medium and low pressure small direct-fired machine etc. 2.2 Kinds of regulators(Gas ... Regulators used indoor, buildings, medium and low pressure small direct-fired machine etc.2.4 Pressure regulator cabinets and device ...