150# ball valves - trunnion vs floating
150# ball valves - trunnion vs floating
(OP)
In my experience most low pressure applications request 2 piece floating ball valves and when not specified I've always sold the 2 piece floater. What instances would a 150# or 300# trunnion be the preferred design. Also what is the advantage of a 3 piece vs a 2 piece body?





RE: 150# ball valves - trunnion vs floating
I generally accept either 2 piece or 3 piece bolted body designs. 2 piece is less steel and so lower weight and potentially lower cost. However, most manufacturers have their own criteria for when they build 2 piece vs. 3 piece and so as end user you often don't get a choice. Certain sizes and pressure classes are one or the other.
RE: 150# ball valves - trunnion vs floating
David
RE: 150# ball valves - trunnion vs floating
RE: 150# ball valves - trunnion vs floating
For ESD valves I've also been specifying Trunnion valves, but on certain critical spec breaks (one I did was ANSI 150 into SDR13.5 HDPE rated at 53 psig) I pull the body bleed and replace it with a PSV set at the downstream MAWP. Never had one of the PSV's go off, but I get a really warm and fuzzy feeling from installing them.
David
RE: 150# ball valves - trunnion vs floating