Fire damper It is installed on the supply and return air pipelines of the ventilation and air conditioning systems and is normally open. In case of a fire, when the gas temperature in the pipeline reaches 70 ℃, the fusible link will fuse, and the valve will automatically close under the action of the torsion spring force, which can meet the requirements of fire resistance stability and integrity within a certain period of time, and plays a role in smoke and fire isolation. When the valve is closed, the closing signal is output.

Smoke and fire control regulating valve, normally open, 70 degree closed, the same as 1, but with one more electrical signal input, can be remotely controlled and closed by the fire control room. It is generally used in the common air duct system for air supply and fire air supplement at ordinary times. In case of fire, it can be controlled to close the room that does not need air supplement;

The normally open smoke exhaust fire damper is fused to close at 280 ℃, normally open, and outputs the electrical signal. This is similar to 1, but the fusing temperature is different. It is generally used at the place where the fire exhaust pipe passes through the firewall. When the smoke temperature exceeds 280 ℃, it will automatically fuse to close, and the smoke exhaust fan can be interlocked to shut down.