Globe control valve
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Sheshtawy
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Assuming that the valve was originally fully open, the friction head loss will increase as the the loss coefficient (K) of the valve increases with throttling (h = K *v^2/2*g). The flow rate downstream will decrease causing the velocity to decrease assuming constant cross-sectional area (Q=A*v)
MikeGlass1969
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friction head and Velocity head both decreases upstream and downstream. You changed the Cv of the valve and the pressure drop across the valve.
MikeGlass1969
Well-known member
Absolutely certain. You are decreasing the volumetric flow upstream and downstream of the valve by closing the valve. Volumetric flow is directly proportional to the velocity. Velocity head and friction head are both directly proportional to velocity.
Examine the Bernoulli and Darcy equations.
Examine the Bernoulli and Darcy equations.
Slay the P.E.
Well-known member
We have uploaded a short write-up that further illustrates the issue.
View attachment EngineerBoards Question 001.pdf
View attachment EngineerBoards Question 001.pdf
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