There are several types of smoking fire prevention valve types: normal -closed smoke fire prevention valves, constant open smoke fire prevention valves, remote control -type smoke fire prevention valve (steel rope control type), and automatic reset smoke fire prevention valve.The functions of various smoke fire prevention valves are shown below: First, the function of normally closed smoke fire prevention valve, also known as the function of secondary action smoke fire prevention valve: 1. Usually present a normal closed state. When the fire occursDC24V power supply, the valve will quickly turn on.2. Open signal of the output valve, lock control control fire smoke 3. You need to open it manually, and manually reset and close.4. When the pipeline temperature reaches 280 ° C, the fuse moves and the valve is closed again.Second, the function of frequent opening of smoke fire prevention valve: 1. Usually present a normal open state. When the fire occurs, the valve is automatically closed after the control center outputs the DC24V power supply.2. When the pipeline temperature reaches 280 ° C, the fuse is moved and the valve is automatically closed.3. The output valve closes the signal, and the smoke is stopped.4. You need to close it manually and turn on manually.Third, the function of remote control -type smoke fire prevention valve (steel rope control type): 1. All functions of normal -closed smoke exhaust fire prevention valves.2. Can be turned on and closer manually.3. Steel rope control distance standard is 6m (ultra -long).Fourth, automatic reset smoking fire prevention valve 1. Usually it is constantly closed. When the fire occurs, the control center enters the DC24V power supply, and the valve will automatically turn on.2. When the pipeline temperature reaches 280 ° C, the fuse moves and the valve is automatically closed.3. Can be opened manually.4. After the valve is turned on, no manual reset is required. As long as the DC24V power supply is entered, the valve can automatically reset to the original shutdown position (this function is limited to the temperature sensor beforethis function).5. The output valve opens the signal, and the lock control controls the start and stop of smoke.6. If you use memory alloy temperature sensors, you can use it repeatedly without replacement.