Siemens offers multiple control valve options. VKF41’s are available from sizes 1-1/2” DN40 to 8” DN200, each with a manual handle option:

VKF41…C for Air, Natural Gas, or other clean gases:
Butterfly valves designed for fitting between counter-flanges
Disk with metallically tight shutoff, (< 0.7% leakage)
Angle of rotation 85°

VKF41…H High Temperature butterfly valve for flue gas recirculation:
550 deg F maximum gas temp
Angle of rotation 360°

VKF41…B Biogas butterfly valve:
Designed for Bio Gas control valve applications
Angle of rotation 360°