How to calculate Kv value?

How to calculate Kv value?

Flow Calculation – (Kv)

1. Kv = m3/h – Flow coefficient.
2. Q = m3/h – Flow.
3. Qn = m3n/h – Normal flow (20°C 760mm Hg)
4. P1 = bar – Inlet pressure – (Gauge pressure + 1)
5. P2 = bar – Outlet pressure – (Gauge pressure – 1)
6. DP = bar – Pressure drop – (Differential pressure between inlet and outlet pressure)

How do you convert KV to Cv?

The Relationship between Cv and Kv is Cv = 1.156 Kv OR Kv = 0.864 Cv.

What is KV value?

The Kv value expresses the amount of flow in a regulating valve at a given valve position with a pressure loss of 1 bar. The Kvs value is a special case of the Kv value, which indicates the flow at a given valve position and a pressure differential of 1 bar.

How do you calculate pressure drop in a Cv?

Calculation of Pressure Loss using the Cv Method

1. C v = Q S G Δ P \displaystyle C_v = Q \sqrt{\frac{SG}{\Delta P}} Cv=QΔPSG.
2. C v = 0.0694 Q ρ Δ P × 999 \displaystyle C_v = 0.0694 Q \sqrt{ \frac{\rho}{\Delta P \times 999}} Cv=0. 0694QΔP×999ρ
3. K v = Q S G Δ P \displaystyle K_v = Q \sqrt{ \frac{SG}{ \Delta P}} Kv=QΔPSG.

How do I calculate valve size?

The basic valve sizing equation Q = Cv√∆P can be used to calculate pressure drop, flow rate, or the flow coefficient. For solutions other than water, a correction for a difference in specific gravity of the solution is necessary. This revised formula would be: Q = Cv[√∆P/Sg] with Sg = specific gravity of the liquid.

What is KV in valve sizing?

The Kv-value is a measure of the flow rate through a valve for a given medium and pressure drop. The larger this value, the higher the flow rate through the valve will be at a given pressure drop. The Kv-value is measured as the flow rate of water in m3/h with a pressure drop of 1 bar at 20°C. …

What is valve Kv?

The Kv value expresses the amount of flow in a regulating valve at a given valve position with a pressure loss of 1 bar. The Kvs value expresses the amount of flow in a regulating valve at a fully-open valve position and a pressure differential of 1 bar.

What is difference between CV and KV?

Kv is the flow coefficient in metric units. Cv is the flow coefficient in imperial units. It is defined as the flow rate in US Gallons per minute [gpm] of water at a temperature of 60 fahrenheit with a pressure drop across the valve of 1 psi.

What is KV m3 h?

Kv is the flow coefficient in metric units. It is defined as the flow rate in cubic meters per hour [m3/h] of water at a temperature of 16 celsius with a pressure drop across the valve of 1 bar. At valves which discharge the flow directly into the environment it is used the non-dimensional Discharge Coefficient(C).

Which valve has highest pressure drop?

the globe valve
Compared with a gate valve or ball valve, the globe valve has considerably higher pressure loss in the fully open position. This is because the flow of fluid changes direction as it goes through the valve.

What is valve sizing coefficient?

The valve sizing coefficient most commonly used as a. measure of the capacity of the body and trim of a control. valve is Cv. One Cv is defined as one U.S. gallon per. minute of 60 degree Fahrenheit water that flows through.

Was ist der Unterschied zwischen kVA und kW?

Einheit ist praktisch in DC-Stromkreisen vorhanden, wodurch kein Unterschied zwischen kVA und kW entsteht. Ein Gerät verbraucht weniger kW, wenn die Spannung nicht mit dem Strom übereinstimmt. Gleichzeitig sinkt der Power Factor natürlich.

Was ist der Kv-Wert?

Der Kv-Wert entspricht dem Wasserdurchfluss durch ein Ventil (in m³/h) bei einer Druckdifferenz von etwa einem Bar (genau 0,98 bar) und einer Wassertemperatur von 5 °C – 30 °C.

Wie ist der Kv-Wert geregelt?

Er kennzeichnet und unterscheidet somit Ventile anhand ihrer Kapazität und beträgt nach DIN IEC 5314: den Wert bei maximal geöffnetem Ventil K100 mit einer Toleranz von ± 10 %. Die Ermittlung des Kv-Wertes ist geregelt in der Technischen Regel VDI/VDE 2173, Strömungstechnische Kenngrößen von Stellventilen und deren Bestimmung.

Was ist der Kv-Wert im Maschinenbau?

Zum K v -Faktor im Maschinenbau siehe Kv-Faktor Der Kv-Wert wird auch als Durchflussfaktor oder als Durchflusskoeffizient bezeichnet. Er ist ein Maß für den erzielbaren Durchsatz einer Flüssigkeit oder eines Gases durch ein Ventil und dient zur Auswahl und Dimensionierung von Ventilen.