The butterfly valves of the series BFV are DVGW approved to the Norm EN 161 with CE product identification number. They are suitable to be used on residential and industrial combustion systems.They are particularly suitable for both manual and automatic control of gases belonging to the first, second and third family and of air.Installation between two flanges ISO 7005 –PN16. This type of butterfly valve can be mounted between flange PN6/10/16, swing-through or with top (sealing optional) and suitable for media temperature up to 550°C