Shut-off dampers, also known as cutoff doors, air duct dampers, or flue dampers, are commonly used in power plants and other industries as flow control media in smoke ducts and air ducts. The wind door can be opened or closed at an angle of 90 degrees, featuring both fully open and fully closed functions to allow or block the flow of medium through a specific pipeline in the system.

The closure door is mainly composed of several parts, including the frame, blades, sealing strips, main shaft, bearings, shaft seal, crank and connecting rod mechanism, and the actuator (optional accessory). The frame is made by steel plate stamping, steel section welding, or casting, while the blades are formed by steel plate stamping or casting. The cross-sectional streamlined blades ensure minimal pressure loss of the medium.

The blades are equipped with a special elastic sealing structure between them and between the blades and the frame, ensuring a sealing rate of over 99% when closed. The blades are connected to the main shaft with fasteners. After the closure shutter is installed on the pipeline, any component can be removed, and it guarantees easy maintenance or replacement of parts while in operation. The shaft collar features a sealing structure and bearings, with excellent sealing performance, no leakage, and high-temperature resistance. The bearings have automatic alignment and automatic compensation functions, which can automatically compensate for the alignment deviation of the front and rear shafts, ensuring that the closure shutter has minimal resistance, no sticking, and smooth rotation.