Pneumatic ventilation butterfly valve is a key equipment widely used in industrial ventilation system, which has a simple and effective structure principle, a wide range of applications and important daily maintenance tasks. This paper will introduce the structure principle, application field and daily maintenance of pneumatic ventilation butterfly valve in detail.

Structure principle:
Pneumatic ventilation butterfly valve is composed of valve body, valve disc, valve stem, sealing ring, etc. When air or gas passes through the valve body, the valve disc will open or close with the rotation of the valve stem, thereby controlling the on-off of the fluid. The sealing ring forms a good seal between the valve disc and the valve seat to ensure the normal operation of the system.

Application areas:
Pneumatic ventilation butterfly valves are widely used in industrial ventilation systems, including petrochemical, electric power, steel, water treatment and other industries. They can be used to control the air flow rate in the ventilation duct, adjust the ventilation volume, and play a key role when it is necessary to cut off or divert the gas flow. It has the advantages of simple structure, small size and light weight, and is suitable for various process requirements.

Routine maintenance:
1. In order to ensure the normal operation and prolong the service life of the pneumatic ventilation butterfly valve, the following are some daily maintenance items that need attention:
2. Regularly check the wear of valve body, valve disc and valve stem, and make necessary replacement or repair.
3. Clean the dirt inside and outside the valve body and keep the passage unblocked.
4. Check whether the sealing ring is worn or aging, and replace it in time to ensure good sealing performance.
5. Check the working status of the pneumatic control device to ensure its normal operation and deal with the fault in time.
6. Regularly lubricate the valve stem and other moving parts to reduce friction and wear.

In short, pneumatic ventilation butterfly valves play a vital role in industrial ventilation systems. By understanding its construction principles, application areas and routine maintenance matters, we can better understand and manage this equipment, ensure the stable operation of the system, and improve production efficiency.