Kv Cv Flow Coefficient - Valvias

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Transcript of Kv Cv Flow Coefficient - Valvias

  • 5/27/2014 Kv Cv Flow Coefficient - Valvias

    http://www.valvias.com/flow-coefficient.php 1/2

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    (liquids) Q: Flow rateP: Pressure DropSg: Specific gravity (1 for water)K: Flow coefficient Kv or Cv

    Basic Concepts > General > Fluid Basics Espaol

    Concepts

    Flow Coefficient CV and Kv

    Flow Coefficient comparative

    Flow coefficient for ball valve

    Flow coefficient for butterfly valve

    Discharge Coefficient

    Reynolds Number

    Flow Equations - Online Calculation

    Flow Coefficient (Cv and Kv)

    Pressure drop Coefficient zeta ()

    Discharge Coefficient (C)

    Flow Rate (Q)

    Flow velocity (v)

    Head drop (h)

    Pressure drop (P)

    Cavitation Number

    Search

    Flow Coefficient Definition

    When flow goes through a valve or any other restricting device it loses some energy. The flowcoefficient is a designing factor which relates head drop (h) or pressure drop (P) across thevalve with the flow rate (Q).

    Go to online calculation of the Flow coefficient Cv and Kv

    Each valve has its own flow coefficient. This depends on how the valve has been designed tolet the flow going through the valve. Therefore, the main differences between different flowcoefficients come from the type of valve, and of course the opening position of the valve.

    Flow coefficient is important in order to select the best valve for a specific application. If thevalve is going to be most of the time opened, probably there should be selected a valve withlow head loss in order to save energy. Or if it is needed a control valve, the range ofcoefficients for the different opening positions of the valve should fit the requirements of theapplication.

    At same flow rate, higher flow coefficient means lower drop pressure across the valve.

    Depending of manufacturer, type of valve, application the flow coefficient can be expressed inseveral ways. The coefficient can be non-dimensional or with units if parameters such asdiameter or density are considered inside the coefficient or just in the equation.

    Most of valve industry have standardized the flow coefficient (K). It is referenced for water at aspecific temperature, and flow rate and drop pressure units. Same model valve has differentcoefficient for each diameter.

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

    Kv = 0.865 CvCv = 1,156 Kv

    (Equivalence between flow coefficients Kv and Cv)

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  • 5/27/2014 Kv Cv Flow Coefficient - Valvias

    http://www.valvias.com/flow-coefficient.php 2/2

    At valves which discharge the flow directly into the environment it is used the non-dimensionalDischarge Coefficient(C).

    Flow Coefficient References

    Tipo de vlvula

    Coeficiente de Caudal (vlvula toda abierta)

    C

    [-]

    Cv[gpm][psi]

    Kv[m/h][bar]

    Referencia

    Annular valve -

    Ball valve (Full bore) 4.7 5100 4370 Jamesbury series 9000 6" dn

    Butterlfy valve -

    Diaphragm valve (Weir) 0.64 690 597 ITT Dia-Flo Plastic Lined 6" dn

    Diaphragm valve (Straightway) 1.3 1400 1211 ITT Dia-Flo Plastic Lined 6" dn

    Gate valve -

    Globe valve -

    Fixed Cone valve 0.86 3700 3200 Henry Platt 12" dn

    Needle valve -

    Plug valve -

    Pinch valve -

    Rubber Duck-Bill check valve 1.0 4300 3700 EVR CPF/CPO 300mm dn

    Spherical valve -

    Tilting disc check valve 0.93 1160 1003 Val-matic 6" dn

    (*) Water density reference (1000kg/m3) to calculate C and Cv KV equivalencies

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