TS-M flue gas damper is designed with two sets dampers and double mechanical linkages to ensure when one damper is in "close'' position, another damper is in "open" position. The bypass damper is operated by manual clutch or single pneumatic actuator (FO position when power failure).
To close the damper, damper discs touch the sealing rings (two malposed half rings) to get the plane sealing effect; the damper shaft and half rings are unique designed for surface sealing.