Bellows control valve
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Bellows control valves are being used more and more frequently. There are generally two types of bellows used in such valves: those that are machined into shape, and those that are made from welded sheet metal. Leaks from the bellows do occur as well; how is it working for everyone? Well, who are some good bellows manufacturers? Let’s talk about them
The bellows you mentioned should be called a pipe compensator, right? It depends on the damaged area and the cause of the damage. It can be repaired depending on the degree of damage. For example, corrosion, metal fatigue cracking, weld failure, etc.
Our devices have used both domestic and imported bellows control valves, and from practical usage results, both types have performed well; there have been no significant leaks caused by damage to the bellows. As for minor leaks, since no corresponding tests for detecting such leaks were conducted, the absence of such incidents does not mean they do not occur.
It’s usually weld separation and wear; when it gets damaged, it needs to be replaced
This has value for restoration; it can be considered.
Bellows that are molded in one go are basically unrepairable. I’ve encountered several cases of bellows leaking; overall, imported ones are of good quality. The tooling is original Japanese product, and German Akka as well as American Fisher products, along with some products from Samson for control valves, are all excellent. For domestically produced bellows, there is a good manufacturer in Shenyang.
For bellows, it is mainly important to determine whether the material is suitable for the medium in question. Bellows control valves are used for media that are contaminated, highly toxic, or valuable. With proper selection and proper welding, leaks are unlikely to occur, as there is also a conventional packing as an additional layer of protection. Of course, this is not absolute, and regular inspections are still necessary.
The main ones are Fisher from the United States, while those used domestically by Samson seem to be made in Shenyang
Yes, it is used in toxic media for 2 years; the reason is still under investigation