Overview of Manual Damper
The manual damper adopts the principle of mechanical transmission, and changes the opening of the valve through manual operation (such as rotating the handle or handwheel), thereby controlling the air volume passing through the valve or changing the direction of the airflow. It does not require external power sources such as electricity or air pressure, and relies entirely on human labor for operation.
Structure & Types of Manual Balancing Damper
There are various types of manual dampers, which can be classified into the following categories based on their structure and usage scenarios:
Handle type air valve:
Features: The valve opening can be adjusted by rotating the handle, making the operation simple and convenient.
Classification: Further subdivided into circular air valves, square air valves, rectangular air valves, etc., to meet the needs of different pipeline shapes and installation spaces.
Handwheel type air valve:
Features: Adjust the valve opening by rotating the handwheel, suitable for situations that require a large operating torque.
Application: Commonly used in large pipelines or situations where precise air volume adjustment is required.
In addition, according to the actual insulation needs, manual dampers can also be divided into ordinary air valves and insulation air valves. The insulation type air valve is wrapped with insulation material (such as 35mm polystyrene) on the outside of the valve body to reduce heat loss and improve energy utilization efficiency.
Technical Specifications of Manual Duct Damper
The main parameters of a manual damper include nominal diameter (DN), temperature range, etc. Generally speaking, the nominal diameter range of manual dampers is between DN50mm and DN300mm, and the temperature range is between -29 ℃ and 300 ℃. Specific parameters and specifications can be customized according to actual usage needs.
Applications of Manual Air Balance Damper
Manual dampers are used in various situations where air volume or direction needs to be adjusted, including but not limited to:
Industrial plant ventilation system: used to regulate the ventilation volume inside the plant, improve air quality, and provide a good environment for production activities.
Commercial building air conditioning system: used to regulate the amount of fresh air introduced, ensuring the freshness and comfort of indoor air.
Underground parking lot ventilation system: In daily use and emergency situations such as fires, the ventilation direction and volume can be manually changed to ensure air safety in the parking lot.
Hospital ward ventilation system: According to the patient's condition and the actual needs of the ward, manually adjust the opening of the air valve to improve the air quality in the ward.
Ventilation system in food processing workshop: According to the process requirements and hygiene standards of food processing, manually operate the air valve to adjust the ventilation volume and time.
Installation and Maintenance Tips of HVAC Duct Manual Volume Backdraft Damper
Installation:
Before installing the manual damper, the appearance of the valve should be inspected to ensure that there are no scratches or deformations.
During installation, it should be ensured that the valve handle or handwheel is easy to operate, and the opening and closing directions of the valve should meet the design requirements.
For manual dampers that require insulation, it should be ensured that the insulation material is installed firmly and without gaps.
maintain:
Regularly check whether the manual damper is flexible in opening and closing, and promptly deal with any jamming phenomenon.
Clean the dust and debris on the surface of the valve to maintain its cleanliness and aesthetics.
If damaged or aged valve seals are found, they should be replaced promptly to ensure the sealing performance of the valve.
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