Hi corne
I think some vendor or some expert on hose can explain the issue better.
The way I understand, Expansion bellow act same like a spring ( with convolution). Both start point & end point of bellow must be in same axis with permissible allowable movement. It can not hold the pressure thrust itself. We need additional mechanism to hold pressure thrust.
Whereas hose is capable of holding pressure thrust itself that’s why start point of hose & end point of hose can be in any direction. If it could not hold pressure thrust then we had to put so many support in hose area wherever it change direction.
Not all hose require convolution in it.
If we cut a slice of hose & make free body diagram for longitudinal force it might be strong enough to hold that forces.
For easy understanding I compare hose with a strong nylon rope , which is flexible also & have high longitudinal strength capacity.
Attach hose connection for pressurized gas line –
http://www.zesco.com/products.cfm?PGroupID=ZP99139002&ref=rottext&subCatID=229Regards
Habib
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