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There is a certain relationship between Cv and Kv. The flow factor Kv is the metric system equivalent of the flow coefficient Cv. Formula of Valve flow coefficient (Kv) Unit Conversion- Cv to Kv It is easy to convert Kv into a Cv unit and vice-versa. First, we convert Cv into Kv. 1 US gal/min = 0.227125 m3/h
Control Valve Relation between Cv and Kv Cv = 1.156Kv
Flow coefficient, Cv, and Flow Factor, Kv, are values used to specify the hydraulic capacity of a control valve. Flow coefficient is an imperial measurement and is defined as: the flow of water through a valve at 60°F in US gallons/minute (gpm) at a pressure drop of 1lb/in².
What is Kv/Cv? How to calculate Kv/Cv?
Calculate flow factor Kv for liquids, steam and gases - metric units. Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves. Some commonly used technical terms in fluid mechanics. Sizing of water control valves - SI units Sizing of water control valves - Imperial units.
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Cv and Kv Flow Coefficients Many manufacturers of control valves choose to publish a Cv flow coefficient or a Kv flow coefficient to describe the flow / pressure loss characteristics of their control valves in a standardized manner. Cv Flow Coefficients:
Cv and Kv relationship
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Conversion formulae for Cv and Kv. It is possible to convert between the flow coefficients Cv and Kv. Kv = 0.857 * Cv. Cv = 1.165 * Kv. FAQs What is flow coefficient Cv for valves? The flow coefficient, also known as the Cv value, is the flow rate of water in U.S. gallons per minute (GPM) at a temperature of 60 𐩑F with a pressure drop of 1.
Flow Coefficient Cv vs. Flow Factor Kv
Flow Coefficient (Cv and Kv) Pressure drop Coefficient zeta (ζ) Discharge Coefficient (C) Flow Rate (Q) Flow velocity (v) Head drop (Δh) Pressure drop (ΔP) Cavitation Number Flow Equations Dimensional Flow Coefficient (Cv and Kv) Calculation A: Area C: Discharge coefficient d: density ( water density = 1000kg/m³ ) D: Diameter g: Gravity 9.8 m/s²
Why we Measure Control Valve flow coefficient (Cv) ? Valve Cv or Kv
Finally, we will compare Cv and Kv, two commonly used flow coefficients, and provide guidance on choosing the right flow coefficient for your needs. Understanding Flow Coefficient (Cv) The valve flow coefficient, often denoted as Cv, measures the fluid flow rate through a control valve.
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Using the K, Cv, Kv Calculator Engineered Software Knowledge Base
Kv is measuring the flow of water under a pressure drop of 1 bar, at 5-30 c. It is expressed in m3/h. 2. Conversion in between Cv and Kv How to convert Cv to Kv or convert Kv to Cv ? It is possible to convert Cv and Kv with the following formula : Cv = 1.16*Kv Kv = 0.862*Cv 3. Valve Cv Excel calculation tool Link to Excel calculation tool
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1. What is the Cv and Kv of a control valve ? Cv and Kv are 2 coefficient allowing to relate the pressure drop through a valve to the flowrate of fluid going through. Cv is commonly called the flow coefficient and Kv is commonly called the flow factor. They have very similar meaning but not exactly the same definition.
How To Know The Cv Or Kv Of A Control Valve Act4apps
Calculate flow factor Kv for liquids, steam and gases - metric units. By using the capacities of valves with different sizes, different types and from different manufacturers - can be compared. is in general determined experimentally expressing flow capacity in metric units - that a valve will pass for a pressure drop of = q (ρ / (1000 (p(1)
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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.
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The relationship between Cv and Kv is Cv = 1.156 * Kv. OR Kv = 0.864 * Cv The flow rate for a liquid Q = Cv * Sq. Root of ( ΔP/SG) Q = Flow in US GPM. Cv = Flow Coefficient of control valve ΔP = Differential pressure SG = Specific Gravity of fluid (reference against water at 60 °F)
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Click calculate, and the Cv value and Kv value will be calculated. Choose a valve with a Kv-value equal to or higher than the calculated value. Gas: Choose a gas type and the inlet temperature. Choose the inlet pressure, the outlet pressure, the required flow rate, and click calculate.
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C v and K v are singles values in units of flowrate that may be used to characterise the relationship between flowrate and pressure loss for fittings and equipment. This article demonstrates how to calculate the C v or K v values, and how to use these values to determine the pressure loss for a given flowrate. Definitions Introduction