## KV-value for steam

### KV-value

Input Result
Steam flow G=
Specific volume of steam at T1 and P2 V1=
Specific volume of steam at T1 and P1/2 V2=
Pressure before valve P1=
Pressure after valve P2=
KV m3/h m3/h
CV Usgal/min

### Steam flow

How much steam passing valve.

### Pressure

Refers to how great the pressure before and after the valve is.

### Specifik volym

Specific volume can also be called volume defined as the volume per mass, ie the volume of a certain amount of mass of steam.

The specific volume (v1) only applicable to non-critical flow while the specific volume (v2) is for critical flow.

### KV-value

Kv = Water flow in m 3 /h at a pressure drop over open valve of 1 bar (100 kPa).

Kvs = The Kv value of the selected valve at fully open valve. Usually with a 30% safety margin to the calculated Kv value.

Difference between Kv and Kvs
Kvs value is the value of the component and Kv-value is the value that the component is expected to have at the operation case.

### CV-värde

The CV value is the American equivalent of the KV value. The CV value is defined as the water flow in the US gallon over a fully open valve with a pressure of 1 psi.