flow resistance of 3 way ball valve
flow resistance of 3 way ball valve
(OP)
Hi All,
Not sure if this is the right place to ask this question.
For a 3 way L port ball valve reduced bore. what flow resistance factor should I use?
Should I simply threat it as a straight reduced bore(k1) + a 90 degree bend(k2)?
So as per Crane T410 paper, K=K1+K2, where K1=formula 5 or 6 given in A-28, and K2=60fT?
Any comment on this?
Thanks
Spoonful.
Not sure if this is the right place to ask this question.
For a 3 way L port ball valve reduced bore. what flow resistance factor should I use?
Should I simply threat it as a straight reduced bore(k1) + a 90 degree bend(k2)?
So as per Crane T410 paper, K=K1+K2, where K1=formula 5 or 6 given in A-28, and K2=60fT?
Any comment on this?
Thanks
Spoonful.





RE: flow resistance of 3 way ball valve
I'd likely do it as a combination of a reduction from the line to the ball ID, the change in direction within the ball (likely as a tee with the flow through the branch) and then the expansion back to line size (if the latter loss is applicable).
RE: flow resistance of 3 way ball valve
From "BigInch's Extremely simple theory of everything."
RE: flow resistance of 3 way ball valve
I don't think my supplier would be at much help,
your way of model it which is pretty much the same as my :
a reduced bore ball valve K1 + a 90 degree mitre bend(to be conservative rather than threat it as elbow) K2,
so total K=K1+K2
so dP= density*k*velocity^2/2
BigInch,
I don't quite understand you way. dP during switch is not what I am after, I am only looking for at one fully open 90 degree position dP.
BTW, dose any one have knowledge of
I.E. Idelchic - Handbook of fluid resistance, Diagram 8-3, perforated thick plate dP, I am trying to use the method given, but it seems my manual calculation result could not match these given in the graph.
Thanks for all the comments
Regards
Reynold
RE: flow resistance of 3 way ball valve
RE: flow resistance of 3 way ball valve
RE: flow resistance of 3 way ball valve
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RE: flow resistance of 3 way ball valve
I would like to use a full bore as for less pressure drop. but I found it hard to find a full bore for 50NB.
RE: flow resistance of 3 way ball valve
A full bore 3-way ball valve is virtually impossible because there isn't enough metal left to have a sufficiently strong ball. If you want a full bore 50NB valve it probably means that you will have to install an 80NB reduced bore valve.
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