Shandong fire control valve low prices fly business! Fire dampers, normally open, 70 ℃ or 280 ℃ closed, generally installed in the duct through the firewall, fires off effect, you can set the output electrical signals, temperature over 70 ℃ or 280 ℃ valve is closed, the linkage to send (s) the fan is turned off. Product Principle installed in the central air-conditioning duct system works easily fluxing temperature control, by the action of gravity and spring mechanism closes the valve. When a fire occurs, the fire invaded the duct, high temperature causes the fusible alloy melting on the valve, or to memory alloy deforms the valve automatically closes, for air duct and the fire district throughout occasions. 2 Categories damper installed 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 ℃, fusible film 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, from smoke fire retardant valves. When the valve is closed, the output off signal. Smoke fire control valve, normally open, 70 degrees closed, with 1, but more an electrical signal input, remote control can eliminate the control room is closed, generally used for peacetime air, fire up a common air duct system can be controlled fire Close unneeded makeup air rooms; normally open type smoke damper, 280 degrees fuse closed, normally open, output electrical signal, and one that is similar to, but different fusing temperature, generally used in fire exhaust pipe through the firewall, flue gas temperature exceeds 280 degrees when automatic fuse off, you can turn off the exhaust fan interaction. Exhaust valve installed in the exhaust system pipeline, usually generally was closed when the fire manual or electric opening, from the smoke effect. When the internal temperature of the flue gas exhaust pipe 280 ℃ closed within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the valve exhaust effects. Smoke damper normally closed (NC, telecommunications numbers turned 280 degrees blown off, or manually turned off) generally used in exhaust systems, exhaust fan can be installed at the inlet of a controlled open by the consumer when the fire control room, the chain is closed also closed 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 the damper, but just ordinary damper device side fuse metal exchange to 280 degrees that a fuse. 3. Automatic smoke damper (Metro Engineering) Fire subway ventilation and air conditioning systems, exhaust valve having 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. Exhaust port if you have installed the necessary piping exhaust valve, use an ordinary single Grille can; otherwise required plate discharges, it is also the institution with the smoke damper. The ad was published by 258 Business TV