Usually always open, fuse action temperature 70 ℃. When the temperature of the air inside the duct reaches 70 ℃, fusible film fuse, the valve automatically closes under the force of the torsion spring. When the valve is closed, the output off signal. Manually shut down, manual reset opening. PY-SD PY-BSD exhaust valve exhaust valve remote control Features: DC24V electrical signal can quickly open the valve. Manually open. Output Enable signal two-speed exhaust fan fire, interlocking exhaust fan. Manual reset closed. PY-BSD exhaust valve can be opened manually remote control, remote control manual reset closed. FH-KVD1 fire control valve features: 70 ℃ fuse action hl3-2a exhaust fan fire, the valve automatically closes. Manually shut down. Output off signal, the interlock related ventilation equipment. Manually open. Manual adjustment of the valve opening angle. PY-SFD smoke damper PY-BSFD remote control smoke damper Features: control center DC24V power input, the valve opens quickly. Manually open. Output Enable signal, the fire interlock row machine. Manual reset closed. 280 ℃ temperature sensor operation, close the valve again. PY-BSFD remote control smoke damper can supply much open fire exhaust fan, manual opening from the electric, manual shutdown. Remote control exhaust valves usually was normally closed, smoke is sent to the control center when the fire by electric signal (DC24V), the solenoid is energized actions performed within the organization, the valve automatically opens, and output on an electrical signal. The valve can be opened manually distance. Remote valve operation after manual reset. Long hl3-2a fire exhaust fan exhaust fan fire Yingshang _ _ Hefei by Shandong Fire fan Fan Air Conditioning Equipment Co. GREAT. Shandong GREAT Fan Air Conditioning Equipment Co. (www.greatfengji.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 into the brilliant GREAT and you work for a better future!