Fire and smoke control valve, normally open, 70 degrees is closed, with a, but more than a telecommunications signal input 150 fire dampers, control room by eliminating remote control turned off, generally used for peacetime air, fire, wind up in a common duct system electric fire valves, fire can be controlled wind up turning off unneeded rooms; normally open type smoke damper, 280 degrees fuse closed, normally open exhaust port damper, the output electrical signal, this and a similar, but different fusing temperature, commonly used to fire the exhaust pipe through the firewall, the flue gas temperature over 280 degrees, turn off automatic fuse, turn off the exhaust fan can be linked. 1. smoke damper normally closed (NC, open telecommunications number, 280 degrees blown off, or manually turn off) generally used in exhaust systems, exhaust fan can be installed in the inlet one, controlled by the control room when the fire extinction open, closed chain also closes the exhaust fan. Exhaust valves, with the three, each unit different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called damper damper, but only for the common damper device side fuse metal fuse into 280 degrees that a .3 automatic smoke damper (Metro Engineering) fire subway ventilation and air conditioning systems, exhaust valves have automatic fire alarm equipment and gas extinguishing system linkage control functions. Each automatic smoke dampers have 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. Fire control valve, Duyun fire dampers, air conditioning service provided by Chen Yu Chen Yu Wu City Air Conditioning Equipment Co., Ltd. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!