Motorised gas control valve to control the gas flow of burner as per the
temperature setting of furnace.size of valve available from 3/4 inch to 10
inches and type of gases can be used are LPG,Natural Gas,Producer Gas etc.
Butterflyrnvalves are used to control air required in the burner inlet for
completerncombustion. Butterfly valves should be the same pipe size as the
equipment inrnthe line they are serving in order to give a negligible
pressure drop when thernbutterfly valve is fully open.
A fuel filter is a filter in the fuel line that screens out dirt and rust
particles from the fuel, normally made into cartridges containing a filter
paper. They are found in most internal combustion engines.