average pressure drop of 1/4 back pressure valve

[Nixon509]

Hello,
Does anyone know what the average pressure drop(or flow rate) of 1/4''(quarter inch) back pressure valve is?
I am having hard time finding this information for my valve.
Thank you

 

[BigInch]

You need the Cv coefficient of the valve to give you pressure drop per gallon of flow across it. You need to look for the Cv for a 1/4 valve at full open, then at any given flowrate you can calculate its pressure drop.

We will design everything from now on using only S.I. units ... except for the pipe diameter.

 

[Pumpsonly]

Cv is not applicable to back pressure valve according to below link.

http://www.plastomatic.com/pomfaq.html#q&a

IMO, the pressure drop of a BPV will varies with the pressure setting.

 

[BigInch]

Nobody cares what the pressure setting is in regards to anything more than how that determines what the differential pressure is at any given time. The only thing that determines flow is the differential pressure across the valve and the geometry of the hole in the valve, described by Cv.

We will design everything from now on using only S.I. units ... except for the pipe diameter.