Ball Valve type selection
Ball Valve type selection
(OP)
what is the different between reduce bore and full bore and who can select? process scope or piping?
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Ball Valve type selection
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RE: Ball Valve type selection
Reduced bore = hole in the ball is smaller than pipe inside dia
Usually a process requires a well defined (or at least) pressure range to work properly. A valve, as other fittings, represents a minor pressure loss and must be taken into account when sizing a pipeline and a pumping system. The flow coefficients (Cv) of the two types of ball valves mentioned above are quite different (reduced bore valves have got smaller Cv).
RE: Ball Valve type selection
http://en.wikipedia.org/wiki/Ball_valve
RE: Ball Valve type selection
OK, if there is no process reason, why would you pick a reduced port valve over a full port? Historically, the reason has been cost. For some reason, prior to about 1990 there was a significant cost savings for reduced-port valves. That stared to change around 1990, and by 1995 you had to look very closely at your cost estimates--in some sizes the reduced port valve was actually more expensive than the full port valves. It is still true today. Even when the reduced port valves are cheaper it is usually a pretty small difference. On the other hand, it can be really hard to get a pig to scamper through a reduced port valve, and you cannot run a smart pig through a reduced port valve.
If you can say that the cost is a wash, then I can not see any reason why you would ever buy a reduced port ball valve.
Now if you were asking about selection criteria between a full port "floating ball valve" and a full port "trunnion ball valve" the discussion gets more interesting, but you didn't ask that.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Ball Valve type selection
RE: Ball Valve type selection
RE: Ball Valve type selection
You will probably get a better range of responses by starting a new thread instead of hijacking this one. You might be surprised at the range of answers if you are careful to create an interesting subject line. This thread is tired and not many people open it anymore.
David