Pneumatic butterfly valves, as a widely used valve in industrial fluid control systems, have a significant impact on the normal operation and service life of the valve due to their installation environment and maintenance precautions. The following is a detailed explanation:

1、 Installation environment

1. Temperature and humidity

• The installation environment temperature of pneumatic butterfly valves should generally be between -20 ℃ and+70 ℃, and the humidity should be below 90% RH.

• Under extreme temperature or humidity conditions, it is necessary to select suitable materials or take protective measures to prevent valve performance degradation or damage due to environmental factors.

2. Corrosive medium

• If corrosive media are present in the installation environment, corrosion-resistant materials or coatings should be selected to prevent the valve from being corroded.

• Under special working conditions, it is recommended to consult the valve manufacturer and choose the appropriate material combination.

3、Vibration and shock

• Avoid installing pneumatic butterfly valves in places with high vibration or frequent impact to avoid affecting the sealing performance and normal operation of the valve.

• If unavoidable, vibration reduction measures should be taken, such as installing vibration reduction brackets or elastic connectors.

4. Space and Operations

• The installation location should be easy to operate and maintain, with sufficient space around for daily inspection, maintenance, and replacement of the valve.

• Valves should be installed in easily accessible locations for manual operation or remote control.

5. Pipeline cleaning

• Before installation, it is necessary to thoroughly clean the pipeline of impurities such as welding slag, rust, and mud to prevent impurities from entering the valve interior, damaging the sealing surface or affecting valve operation.

• Ensure that there are no foreign objects inside the pipeline to avoid obstruction when the valve is opened or closed.

2、 Maintenance precautions

1. Daily inspection

• Appearance inspection: Regularly inspect the appearance of the valve, checking for signs of damage, corrosion, or leakage in the valve body, stem, connecting flanges, and other parts.

• Sealing performance inspection: Check if there is any leakage when the valve is closed, which can be confirmed by observation or pressure testing.

• Operation status monitoring: Pay attention to whether the valve operates normally during operation, including the speed and flexibility of opening and closing.

2. Regular maintenance

• Cleaning and lubrication: Regularly clean the dust, oil stains, and other impurities on the surface of the valve, lubricate moving parts such as the valve stem and bearings, reduce friction, and extend service life.

• Seal maintenance: Regularly check the condition of soft seals (such as rubber seals). If there is wear, aging, or damage, they should be replaced in a timely manner.

• Pneumatic system maintenance：

Air source inspection: Ensure that the air source is dry and clean, regularly discharge accumulated water and impurities from the air filter, and prevent moisture and impurities from entering the pneumatic actuator.

Inspection of actuator: Check whether the piston, cylinder, spring and other components of the pneumatic actuator are worn, deformed or leaking. If there is any leakage, repair or replace the seals in a timely manner.

Electromagnetic valve maintenance: Regularly check the working status of the solenoid valve, clean internal impurities, and prevent valve core jamming.

3. Regular functional testing

• Regularly test the opening and closing operation of pneumatic butterfly valves, observing whether the valve moves flexibly and quickly, whether there is any jamming, shaking or abnormal noise.

• Conduct a sealing performance test to ensure that the valve is leak free when closed.

4. Fault handling

• Leakage fault: If a valve leakage is found, first check whether the seal is damaged. If it is damaged, it should be replaced in a timely manner; Next, check if the valve is installed correctly and if there is any looseness or deformation.

• Action malfunction: If the valve action is not flexible or stuck, it is necessary to check whether the valve stem is bent or deformed, whether the valve core is stuck by impurities, whether the pneumatic actuator is faulty, etc., and take corresponding maintenance measures.

5. Long term shutdown maintenance

• If the valve is not in use for a long time, manual operation should be performed regularly to prevent the valve stem from sticking to the seal.

• Before shutdown, the valve should be cleaned and coated with rust proof oil to prevent rusting of the valve body.