Good point, Charles. I've worked in the past (about 20 years ago) with some Festo engineers with very positive results. It was an implementation of a Pneumatic fire pump engine controller panel, meant to replace an improperly selected electrical panel that would never comply with the hazardous area requirements. Even when Festo in Mexico didn't had that specialty area in their line at that time, they were supported from Germany and were able to supply the panels on time and working as desired. The fact in that case was that the company personnel had the attitude to proceed to tackle the job. Other companies would simply had declined. Amclaussen.
Bellows can be made to endure if the design is correct. I've seen many bellows failing when the geometry or materials were inapropriate. Stress concentration in the creases or pleats is a frequently seen cause of failure. On the contrary, properly made Speaker cone suspensions usually operate for many more cycles than bellows without developing cracks or ruptures, and those that fail are frequently because of poor material selection (foam speaker surrounds come to my mind). but I concour that it can be a source of maintenence nightmares if design or execution is not correct. Amclaussen.
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