Control Valves
Control Valves
(OP)
I need some practical insight here, gentlemen.
I have a flow of about 350 cubic meters per hour.
This works fine for 10 inch piping (falls well within the range of recommended velocities).
What would work better:
A) having a 10 inch control valve straight on the line with no reducers?
B) having the 10 inch reduce to 8 inches then have an 8 inch control valve, then expand back to 10 inches? Will this ensure more proper control than option A?
Or... is this all valve manufacter dependant aside from rules of thumb.
I have a flow of about 350 cubic meters per hour.
This works fine for 10 inch piping (falls well within the range of recommended velocities).
What would work better:
A) having a 10 inch control valve straight on the line with no reducers?
B) having the 10 inch reduce to 8 inches then have an 8 inch control valve, then expand back to 10 inches? Will this ensure more proper control than option A?
Or... is this all valve manufacter dependant aside from rules of thumb.





RE: Control Valves
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Control Valves
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Control Valves
RE: Control Valves
Good luck,
Latexman
RE: Control Valves
Control valve sizing is a well established procedure. Why not just do the calculation properly and know that you will have the correct answer? It's not beyond the bounds of possibility that you actually need a 6" valve.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Control Valves
Bear in mind that both the flow rate and pressure drop across the valve changes between the rated and turndown case.
Cilliers
www.korf.co.uk
RE: Control Valves
Bear in mind that both the flow rate and pressure drop across the valve changes between the rated and turndown case."
Do you have a reference/calculation method I can follow for this?
I understand the Cv calculation method for control valve sizing, but I am having difficulties getting a Cv table from the vendors.
RE: Control Valves
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Control Valves
RE: Control Valves
RE: Control Valves
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/