You raised some good questions. The correct answer is composites are application dependent. The aspect that I like most about composites (advanced composites - elevated temperature/pressure - mainly fiberglass/graphite) is their ability to fabricated strong, compound contoured parts simply...
Tankers, cruise ships, military vessels, even submarines do any of these use TMBV's for ballast control? What type of valves are designed for this application? My interest/ motivation for understanding is academic not sales so please provide as much information as possible.