Inevitable problems in the inspection of pneumatic butterfly valves?
The pneumatic butterfly valve on the car is more important than the safety of the car, so we should also pay attention to whether the pneumatic butterfly valve can also work normally during the car inspection. In addition to the time of vehicle inspection, we can detect the pneumatic butterfly valve, and in ordinary times we can also stop the inspection ourselves. Next, our personnel of metal pneumatic butterfly valve will sort out some inevitable inspection steps for you:
When the car runs 10 to 15 kilometers on the uneven road, touch the pneumatic butterfly valve housing by hand. If it does not heat up, it indicates that the pneumatic butterfly valve may have lost its shock absorption effect due to lack of oil or damage of main parts. It should be removed for maintenance or replaced with new parts.
The failure or damage of the pneumatic butterfly valve will directly affect the ride comfort and comfort of the car, and will also affect the service life of the car parts. Therefore, the inspection and maintenance of pneumatic butterfly valves are also essential. If there is abnormal continuous vibration during the driving process of the car, carefully check whether the pneumatic butterfly valve can leak oil, and if it does, clean it up.
Check the working condition of the pneumatic butterfly valve when the car is suspended from the secondary home care. The inspection method is: fix the lower end of the pneumatic butterfly valve on the bench clamp, stretch and tighten it several times by hand, the normal pneumatic butterfly valve should have a certain resistance, and the stretching resistance should be greater than the resistance when tightening. If it is unstable or has no resistance, it may be that the pneumatic butterfly valve is short of oil or the parts are damaged. It should be repaired or replaced with new parts.
These are the inevitable problems that we usually check. I hope they can help the car owners. This article is organized by Songxia Xizhen Pneumatic Butterfly Valve Co., Ltd. You can pay more attention to our website and our metal pneumatic butterfly valve. Our website is www.shsxjzq.cn. If you have any questions, you can leave a message online and we will give you a timely reply.

Why flange pneumatic butterfly valve is aging
The corrosion cracking of flange pneumatic butterfly valve is caused by the sensitivity of alloy (material) and specific medium (environmental factors), such as the application of austenitic flange pneumatic butterfly valve in the solution containing chloride; Some tensile stresses (mechanical elements), including Exter. stress, phase change stress and residual stress.
Assuming that these three basic conditions are met, stress corrosion damage of flange pneumatic butterfly valve may occur. When stress corrosion cracking occurs, there is no obvious uniform corrosion, so that there are few corrosion products, sometimes it is difficult to find with the naked eye, so stress corrosion is a very risky damage. The stress corrosion process can be divided into three stages.
The first stage is the incubation period. In this stage, due to the localized process of corrosion and the result of tensile stress, the crack core, that is, the small pit formed at the corrosion sensitive part of the flange pneumatic butterfly valve, is the first choice; The second stage is expansion. NT stage of corrosion cracking. When the crack nucleates, the crack shrinks under the combined action of corrosive medium and metal tensile stress, forming a part damage and generating a slender crack. In the third stage, due to the concentration of local tensile stress, the crack grows rapidly, which will cause serious damage in a short time.
The stress corrosion cracking of flange pneumatic butterfly valve is related to the characteristics of medium, temperature and stress, as well as the composition and structure of steel. The influence of these elements is described below. Generally speaking, with the increase of chloride concentration, the stress corrosion cracking time of Cr Ni flange pneumatic butterfly valve is shortened. It is generally believed that MgCl 2 is the most prone to stress corrosion cracking, and the corrosion effect of different chlorides decreases with the order of Mg2+, Fe3+, Ca2+, Na+and Li+plasma.
Influence of medium temperature: It is generally believed that stress corrosion is easy to occur when the temperature rises, but the temperature transition is too high. There is also a critical fracture at the temperature of some steels. According to statistics, the Cr Ni stress corrosion temperature range of austenitic flange pneumatic butterfly valves is between 50 ℃ and 300 ℃.
Effects of alloy elements and stress: It can be seen that the increase of nickel alloy elements in steel and silicon can improve the resistance to stress corrosion cracking of austenitic flange pneumatic butterfly valves in MgCl 2 solution, while nitrogen, phosphorus and other elements in steel reduce the corrosion resistance. Stress corrosion cracking of flange pneumatic butterfly valve in concentrated chloride medium.