The main parameters of fire dampers include the following aspects:
Rated diameter: This is the diameter size of the fire damper, indicating the maximum medium flow rate that the valve can pass through. According to the requirements of the pipeline system, the rated diameter of the fire damper may vary.
Rated working pressure: Fire dampers are designed with a rated working pressure range, which represents the maximum pressure that the valve can withstand during normal operation. Beyond this pressure range, the performance and safety of the valve may be affected.
Flow coefficient: Flow coefficient is an important parameter for measuring the flow capacity of a valve, which represents the flow rate of the medium that the valve can pass through at a unit pressure. The larger the flow coefficient, the stronger the flow capacity of the valve.
Protection level: Protection level is usually used to indicate the sealing performance and dust and water resistance of valves. For fire dampers, a good level of protection can ensure that in the event of a fire, the valve can effectively prevent the spread of fire and smoke.
Action temperature of the melting ring: This is the melting temperature of the melting ring inside the fire damper. When the temperature of the flue gas in the pipeline reaches this temperature, the melting ring will melt, triggering the closing mechanism of the valve. Common operating temperatures for melting rings include 70 ℃ and 280 ℃.
Control power supply voltage and current: For electric fire dampers, controlling power supply voltage and current is a key parameter to ensure the normal operation of the valve. Usually, the control power supply voltage for electric fire dampers is DC24V, and the current varies depending on the model and specifications of the valve.
Fire resistance rating: The fire resistance rating indicates the time that a valve can maintain its performance and structural integrity in the event of a fire. For fire dampers, a higher fire resistance rating means that they can play a fire prevention role for a longer period of time in a fire.
Leakage rate: Leakage rate refers to the flow rate of the medium leaked through the valve when it is closed. For fire dampers, lower air leakage can ensure that the valve can effectively prevent the spread of fire and smoke in the event of a fire.
Fully open inlet resistance coefficient: The fully open inlet resistance coefficient represents the magnitude of the resistance generated by the valve to the flow of the medium in the fully open state. A smaller full inlet resistance coefficient means that the valve has less impact on the flow of the medium, which is beneficial for the normal operation of the pipeline system.
In addition, depending on the specific type and application scenario of the fire damper, other parameters may also be involved, such as actuator model, action mode, driving mode, etc. When choosing a fire damper, the appropriate model should be selected based on specific scenarios and requirements, and installation, debugging, and maintenance should be strictly carried out according to its parameters to ensure the performance and reliability of the fire damper.