BALL VALVE BALL VALVE kali_0142 (Mechanical) (OP) 31 Oct 17 09:00 PLEASE FRIENDS. CAN ANYONE TELL ABOUT DIFFERENTIATE FLOATING AND TRUNNION BALL VALVE. AND WHERE IT MAINLY USED AND WHY? PLEASE RE: BALL VALVE LittleInch (Petroleum) 31 Oct 17 09:14 Please do some basic research and searches on this site and others FIRST, then come back and ask about some particular bit you don't understand. This is not a site for students or a teaching site, but one for engineers to discuss specific issues. Also don't write in CAPITALS again. It's interpreted as shouting. Remember - More details = better answers Also: If you get a response it's polite to respond to it.