Kv flow coefficient 1

[SD12]

Hello.

I try to understand the following equation: Kv = Q / sqrt(delta p), whre "Kv" is in m^3/s, "Q" is in m^3/s and "delta p" is in MPa (or bar).
If we divide flow (m^3/s) by the square root of pressure difference (MPa), how do we get the value of Kv to be in m^3/s?

Please, give me an example if possible.

Best regards,
Sergey

 

[RVAmeche]

You left off a bit - Kv isn't just m3/s, its m3/s @ 16C with a dP of 1 bar.

Kv & Cv are not straight up flow rate values; the actual flow will need to be determined through modeling based upon actual system resistances and actual dP thru the valve.

 

[moideen]

for example,

Flow rate = 34 l/s
Delta P =20 kpa
Factor = 36
sqrt of deltaP =4.47

Kv=(34*36)/4.47= 274