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30
2022
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09
What should be paid attention to when applying ball valves to pipelines?
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What should be paid attention to when applying ball valves to pipelines?
Two main reasons for ball valve damage are: first, the valve is not in place; Second, the sealing surface is damaged.
There are several reasons why the ball valve can not be opened and closed in place:
1. Due to the structure of the ball valve, materials are easy to accumulate. Materials are easy to accumulate in the valve chamber, bearing chamber, spring and valve chamber. Due to the structure of the ball valve, materials are difficult to handle, and purging will greatly affect the coating of the ball valve.
2. Due to frequent switching, the internal parts of the ball valve change and the mechanical properties change.
3. The cylinder output is too small and the torque is not enough.
4. Among the bucket lock valves, the longest occurrence of the ball valve is pressure holding and jamming, which is determined by the position of the bucket lock valve in its process. The structure of the ball valve cannot be avoided.
5. The metal bonding phenomenon is mainly caused by the mismatch in the selection of hard coatings by manufacturers.
6. Scraper failure is mainly due to the manufacturer's failure to select the appropriate material when selecting the scraper material, which makes it not rigid enough and easy to deform. In addition, the spring strength is not enough when selecting the spring.
7. The packing fails. Because of the high pressure change at the slag locking position of the locking bucket, the packing is easy to be damaged.
8. Thermal expansion and cold contraction
The following reasons affect the damage of the sealing surface of the ball valve:
1. Metal bonding, metal bonding phenomenon can be said to be a great contributor to the damage of hard seal ball valve.
2. Corrosion.
3. Creep.
4. Wear.
5. Scouring, because the corrosion, creep and friction of the ball valve are continuous in the process of use, and the scouring and friction of the ball valve are always a part of the friction, and minor damage will lead to the intensification of the scouring, and finally the ball valve will be completely scrapped.
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