Combustion and Exhaust Gas Butterfly Control Valves On/Off and Control Butterfly Valves for Exhaust and Combustion Gases up to 550 degC Butterfly Control Valves for Exhaust Gases and Gases up to 900 degC High Temperature Exhaust Gas Butterfly Control Valves up to 900 degC Automatic Shut-Off Butterfly Valves for Combustion Gas Pipelines to Gas Burners acc. to DIN EN 161 Standard and certified by DVGW (German Technical and Scientific Gas Water Institute). For more information, please contact us at: