Floating & Trunnion Mounted Ball Valves
Floating & Trunnion Mounted Ball Valves
(OP)
Guys,
With regards to floating and trunnion mounted ball valves operating in natural gas.
Looking through the manufacturers catalogues, floating ball is limited to 600lbs for some reason and trunnion mount goes to 2500lbs. Asking questions about this seems to get vague answers.
My question is;
Is there a cut off pressure or diameter where one type would stop and the other begins? i.e would floating ball be used up to 600lbs at a maximum diameter of 6", 8" at 300lbs etc.. and above this trunion. I would appreciate informed comment with regards to a possible rule of thumb.
With regards to floating and trunnion mounted ball valves operating in natural gas.
Looking through the manufacturers catalogues, floating ball is limited to 600lbs for some reason and trunnion mount goes to 2500lbs. Asking questions about this seems to get vague answers.
My question is;
Is there a cut off pressure or diameter where one type would stop and the other begins? i.e would floating ball be used up to 600lbs at a maximum diameter of 6", 8" at 300lbs etc.. and above this trunion. I would appreciate informed comment with regards to a possible rule of thumb.





RE: Floating & Trunnion Mounted Ball Valves
I just looked in a couple of catalogs and both manufacturers stop making floating ball valves around 12-inch for ANSI 300 and around 8-inch for ANSI 600.
I've found that the cost savings above about 3-inch are a false economy and I simply don't spec flanged floating ball valves (i.e., if the line is too big to thread the valves in, get a trunnion). Virtually every ball valve problem I've ever had has been with a floater.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Floating & Trunnion Mounted Ball Valves
RE: Floating & Trunnion Mounted Ball Valves
bcd
RE: Floating & Trunnion Mounted Ball Valves