The application of 3C smoke fire prevention valves is essential today, especially in some high -rise buildings.As one of the 3C fire valve, 3C smoke fire prevention valves are also an advantageous fire prevention valve that often 3C certification.It generally has the following three forms: 1. Normally closed smoke exhaust fire prevention valve (normal closed, telegraph signal opening, 280 degrees fuse off, or manual shutdown) is generally used in the smoke exhaust system, which can be installed in the smoke discharge inlet port.In the fire, the control room is controlled. When it is closed, you can also lock the smoke discharge 2. Some smoke exhaust valves. Some are called smoke exhaust valves according to its action temperature.Fang just replaced the fuse metal of ordinary fire prevention valves with the kind of 280 degrees of fuse .3. Full automatic smoke fire prevention valve (for subway engineering) underground railway ventilation, air -conditioning system fire prevention, smoke exhaust valve has automatic fire alarm equipment and fire alarm equipment and fire alarm equipment and fire.The function of the linked control of the gas fire extinguishing system.There are two independent electric control signals for each automatic smoke prevention and fire prevention valve, which are monitored by EMCS and Qi Calcation systems, and the control signal is DC24V ± 10%signal.There are six independent feedback signals in each automatic smoke prevention and fire prevention valve (three opens in place, and three levels in place) feedback signals.