Stainless steel bellows is a kind of sealing elastic element made of stainless steel sheet.
Multi-ply bellows are relative to single-ply bellows. It is a structural type of bellows.
The product concept of multi-ply bellows is known only to a few people with expertise in bellows.
Bellows are formed from a variety of welded or seamless thin-walled metal pipes. Some bellows are formed from a single metal pipe.
Some are formed by stacking two or more metal pipes together, we collectively call them multi-ply bellows.
What’s single-ply bellows?
A bellows formed from a single metal pipe, at this point we call it a single-ply bellows.
What’s multi-ply bellows?
Multi-ply bellows are formed from multiple metal pipes stacked together.
Through accurate calculation and precise processing, one ply of multiple metal pipes is tightly sleeved on another ply.
How to tell if it is multi-ply bellows?
Under normal circumstances, it is difficult for us to distinguish whether a bellows is a multi-ply or not by visual observation.
There is no obvious difference in appearance and size between single-ply bellows and multi-ply bellows.
Here we share with you the easiest and quickest way to tell the difference: check whether the outer and inner welds of the bellows overlap.
Single-ply bellows are formed from a single metal pipe, so it has only one weld. The multi-ply bellows is different.
According to the technical requirements for the production of bellows expansion joints, the welds of each layer of metal pipes forming the bellows must be staggered and kept at a certain distance.
Observe the outside and inside of the bellows separately, and the longitudinal welds of the bellows are not in the same position.
We can conclude that this bellows is a multi-ply bellows.
Advantages of multi-ply bellows.
Under the same working conditions, single-ply bellows are usually formed from thicker metal pipes.
The multi-ply bellows is formed by several thin-walled metal pipes that are nested together, and its total wall thickness is close to that of the single-ply bellows.
The axial stiffness of multi-ply bellows is much lower than that of single-ply bellows.
