1. damper damper on for ventilation, air conditioning or exhaust system pipes, the basic functions and applications are shown in Table 1.2. Selection valve should pay attention to the valve's function, normally open or normally closed, shut down automatically open, manual OFF ON, manual reset, signal output, remote control and other requirements. 3. If the valve and fan interaction should be used with double micro-switch device. 5. The body should be steel blade thickness of 2 ~ 6mm, the body of non-combustible material damper manufacturers, rotating parts should be corrosion-resistant metal material, and flexible rotation. Valve shell thickness not less than 2mm. Yi Rong parts in accordance with recognized standards of the fire department. When the gas temperature in the pipeline delivered reaches the fusible metal melting temperature fusible sheet fuse damper principle, compression spring and spring pin on the mandrel quickly lay their clutch pad, the damper specifications, clutches and vane adjustment mechanism is disengaged, since the body is equipped with two torsion springs, the blades rotated by torque occurs. Thus, the damper actuator mechanical drive principle, no electricity, gas and other energy sources, which can ensure the fire can play a role in any case. Damper quotes, fire dampers, air conditioning provided by Chen Yu Chen Yu Wu City Air Conditioning Equipment Co., Ltd .. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) strong, credible, Shandong Texas 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 into the brilliant air conditioning and you work for a better future!