1、 Confirm the preparation before installation of pneumatic ball valve: ensure that the installation position of pneumatic ball valve is on the same axis, the two flanges on the pipeline should be kept parallel, and confirm that the pipeline can bear the weight of the ball valve itself. If it is found that the pipeline cannot bear the weight of the ball valve, provide corresponding support for the pipeline before installation
Confirm whether there are impurities, welding slag, etc. in the pipeline, and purge the pipeline.
Check the nameplate of the pneumatic ball valve, operate the pneumatic ball valve fully open and fully closed for several times, confirm that the valve can work normally, and then check all details of the valve comprehensively to ensure that the valve is intact.
Remove the protective covers at both ends of the pneumatic valve, check whether the inside of the valve body is clean, and clean the inner cavity of the valve body. Since the sealing surface of the pneumatic valve is spherical, even small sundries may cause damage to the sealing surface.

Six conditions of stainless steel pneumatic butterfly valve before scrapping
As we all know, the stainless steel pneumatic butterfly valve has strong corrosion resistance and long service life. However, in the long-term operation process, due to the problems of the product itself and the application, the stainless steel pneumatic butterfly valve will reach the scrap specification early. In order to help you distinguish the products that were once scrapped, today's stainless steel pneumatic butterfly valve manufacturer summarizes the following conditions:
1. Weld cracking. The flexible bellows section of stainless steel pneumatic butterfly valve mostly adopts longitudinal seam welded pipe. Due to the quality defect of longitudinal seam welding itself, the pipe strength is not enough to cause cracking and destruction at the weld. This damage is a quality problem of longitudinal weld of bellows, so the control of weld quality should be strengthened.
2. Explosion occurs when the pressure is not enough. Due to the high pressure and temperature of the escorting medium, the pressure of the bellows is not enough to withstand pressure, and the slope burst occurs. This kind of damage is caused by the design and selection error, so the selection should be stopped strictly according to the hose design and selection specification, and the parameters of corrugated pipe and net sleeve should be affirmed.
3. Fatigue destroys. Under the dynamic working condition, the pneumatic butterfly valve is often damaged by fatigue cracks under the cyclic load. In order to extend the service life, it is necessary to ensure that the hose design and selection are correct. 4. The steel wire mesh sleeve of stainless steel pneumatic butterfly valve is pulled off. Due to the reason of welding quality, the hose, ring and wire mesh sleeve in the process of trinity welding constitute a part of the steel wire's faulty welding (over burning or final welding).
5. The wire mesh is pulled off. During the installation of the hose, the hose will be stretched and twisted due to improper installation or high pressure. When the stress generated by stretching or twisting exceeds the ultimate strength of the hose wire mesh sleeve, the mesh sleeve at the welding part of the hose trinity or the mesh sleeve at other parts will be pulled off, thus causing the hose drum to be stretched and damaged, causing media disclosure Therefore, the design and selection shall be accurate, and the device shall be correct.
6. The welding quality defect of stainless steel pneumatic butterfly valve connector (internal connection part) constitutes the failure of the hose. When the hose body is welded with the hose connector, welding defects will occur when the operation is not correct, and these defects are difficult to find during the pressure test inspection. When the pneumatic butterfly valve is connected to the medium pipeline, it will crack or break at the defect due to fatigue and other reasons after long-term use, and finally form the medium disclosure of the escort pipeline.
Once the stainless steel pneumatic butterfly valve presents the above six conditions, it is not far from being scrapped. Based on these possible conditions, it can also help us find out the cause of the failure of the stainless steel pneumatic butterfly valve, so as to solve the problem from the source and make the stainless steel pneumatic butterfly valve reach the original service life.