Damper: installation in the ventilation, air conditioning system, the return air duct on the road, usually was turned on, when a fire in the pipeline when the gas temperature reaches 70 ℃ vent valve, fusible sheet fuse, the valve automatically closes under the force of the torsion spring within a certain period of time to meet the fire resistance stability and fire integrity requirements wind valve, from smoke fire retardant valves. When the valve is closed, the output close number. 1. smoke damper (normally closed electrical signal is turned 280 degrees blown off, or manually turned off) generally used in exhaust systems, you can install an exhaust fan in the inlet valve, controlling the opening by the consumer when the fire control room When turning the chain also closes the exhaust fan. 2. The exhaust valves, with the three exhaust valves, various units of different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called the damper, but the device side just ordinary fire fusing metal valve 280 into that kind of fuse. 3. Automatic smoke damper (underground engineering) Fire, smoke valve subway ventilation and air conditioning systems have automatic fire alarm equipment and gas extinguishing system linkage control functions. Each automatic smoke dampers with two independent electric control signal, respectively, by EMCS, gas consumption system to monitor, control signals are DC24V ± 10% signal. Each automatic smoke dampers have six independent feedback signal (three open place, three off place) feedback signals are normally open dry contact signal. Delivery valve, damper Qiaokou, Wuhan Han Wei Wei Li Yuen Yuen provided by the Wuhan-being of Equipment Co., Ltd. Wuhan Han Wei Li Yuen-being of Equipment Co., Ltd. (www.whhwly.com) strong, credible, in Wuhan, Hubei fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wuhan Han Wei Li Yuen and you hand into the brilliant, for a better future!