Valve CV value and Kv value conversion represents what, how to calculate

Valve flow coefficient is often expressed as CV, and its definition conditions are different from those in China. CV is defined as: when the control valve is fully open, the pressure difference at both ends of the valve Δ P is 1 pound / inch ² When the medium is 60 ° f clean water, the flow through the regulating valve per minute is expressed in gal / Score. Due to the different definitions of kV and CV, the measured values are different, and the conversion relationship between them is: CV = one . 167Kv

Cv = one . 167kv. Generally, CV is equal to kV.

CV value definition of CV value: CV value represents the flow capacity of the component to the liquid ; Namely: discharge coefficient. For valves, it is generally called CV value in foreign countries and Kv value in China.

Measurement of CV value: the measured element is fully open, and the pressure difference between the two ends of the element △ P .= 1bf / in ( 1lbf / in = six . 89kpa) at 60 ℃ (15 ℃) . 5 ℃. The flow rate through the element is QV, in usgas / min（USgas / min = three . 785L / The CV value of flow capacity is 0

Calculation formula of CV value: CV = qv *[ρ* △p0 /(ρ 0 * △p )]^ 0 . five

Where:

CV: circulation capacity, usgas / min

QV: measured water flow, usgas / min

ρ : measured water density, G / cm；

ρ The density of water at 0:60 F, ρ 0 = 1g / cm；

△p .= p1 - p2。 P1 and P2 are the pressure difference between upstream and downstream of the measured element, LBF / in。

Definition of Kv value: Kv value is a parameter and expression method of gas flow characteristics.

Measurement of Kv value: the measured element is fully open, and the pressure difference between the two ends of the element △ P .== 0 . 1MPa, fluid density ρ= 1g / Cm; The flow through the element is QV (m) / h) Then the value of circulation capacity kV is

Calculation of Kv value: kV = qv *[ρ* △p0 /(ρ 0 * △p )]^ 0 . five

Where:

KV: circulation capacity, M / h；

ρ : measured fluid density, G / cm；

△p .= p1 - p2。 P1 and P2 are the pressure difference between the upstream and downstream of the measured element, MPa.

The relationship between kV and CV: CV = one . 167kv to learn more about the valve CV value and Kv value conversion represents what, how to calculate, please call our customer service or technical department!