I run one of those on the hot-side of my mess. That particular model includes a sleeve on the interior that keeps the moving stuff off the rough profile of the bellows. (Attached on the inlet end, floating on the outlet end).
- In my application, the only movement the bellows accommodates is mostly thermally driven so I can't speak for the overall range of movement.
- While the measurements are 3" ID for the inlet and outlet, that internal sleeve has things neck down perhaps a quarter of an inch or so.
- IIRC, the thing is not thick-walled. Maybe 20ish gauge or there abouts.
- 304 stainless steel construction.
- It is my belief the thing is NOT made to withstand
substantial/constant flexing as in that sense, work-hardening will result in the bellows fracturing.
- From my point of view,
I think, it could comfortably and reliably accommodate perhaps 10* of flex (The internal sleeve limits that), maybe 1/4" expansion/contraction, and absolutely NO torsional movement.
- My application has the thing deal with around 60(?) psig of 1000*f exhaust gas.
Over all, it appears well constructed and if kept within a reasonable range of movement, it should work OK for a while. We'll see.
IIRC, they are available with and without the internal sleeve, as well as with or without an external braided SS sleeve.
Hope this helps.