Flow Coefficient C V Vs. Flow Factor K V - The Engineering ToolBox

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Flow Coefficient Cv vs. Flow Factor Kv

Comparing flow coefficients Cv to flow factors Kv.

The flow coefficient - Cv - or the flow factor - Kv - are commonly used to specify capacities of control valves.

Flow Coefficient - Cv

It is often convenient to express the capacity and flow characteristic of a control valve in terms of the

• Flow Coefficient - Cv

The flow coefficient - Cv - is based on the imperial units system and is defined as:

• the flow of water through a valve at 60 oF in US gallon/minute at a pressure drop of 1 lb/in2

• Water Control Valves - flow coefficient Cv diagram

The flow coefficient is commonly used in the U.S.

Flow Factor - Kv

The metric equivalent of the flow coefficient - Cv - is based on the SI-system and is called the

• Flow Factor - Kv

The flow factor - Kv - is defined as

• the flow of water with temperature ranging 5 - 30 oC through a valve in cubic meters per hour (m3/h) with a pressure drop of 1 bar

• Water Control Valves - Kv Flow Coefficient Diagram

The flow factor is commonly used outside U.S.

Converting between Flow Coefficient Cv and Flow Factor Kv

The relationship between Cv and Kv can be expressed as:

• Cv = 1.16 Kv (1)
• Kv = 0.862 Cv (2)

Download and print Flow Coefficient - Cv vs. Kv chart

Related Topics

• Control Valve Sizing

  Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.

• Design of Control and Safety Valves

  Sizing and dimensions of control valves & equipment in steam and condensate systems.

• Fluid Mechanics

  The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

• Piping Systems

  Calculate dimensions of pipes and tubes. Pressure drop calculations and head loss charts. Use of different piping materials. Insulation of pipes and tubes and heat loss diagrams.

• Process Control Systems

  Instrumentation, design and documentation of process control systems.

• Sizing of Steam and Condensate Pipes

  Dimensions of steam and condensate pipe lines. Calculate pressure losses, recommended velocities, capacities and more.

• Steam and Condensate

  Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

Related Documents

• Ball Valves - Flow Coefficients Cv

  Flow coefficients - Cv - for typical ball valves - reduced and full bore.

• Butterfly Valves - Flow Coefficients Cv

  Typical flow coefficients - Cv - for butterfly valves.

• Control Valves - Adding Flow Coefficients for Valves in Series or Parallel

  How to add flow coefficients for control valves in series or parallel.

• Liquid, Steam and Gas - Flow Coefficients Cv

  Calculate flow coefficients for the design of control valves - Imperial units.

• Liquid, Steam and Gas - Flow Factor Kv

  Calculate flow factor Kv for liquids, steam and gases - metric units.

• Straight Through Diaphragm Valves - Flow Coefficients

  Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.

• Technical Terms in Fluid Mechanics

  Some commonly used technical terms in fluid mechanics.

• Water Control Valves - Flow Factor Kv Diagram

  Sizing of water control valves - SI units

• Water Control Valves - Flow Coefficient Cv Diagram

  Sizing of water control valves - Imperial units.

• Water Control Valves - Kv Calculation

  Designing water process control valves and their Kv values.

• Weir Diaphragm Valves - Flow Coefficients and Flow Factors

  Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.

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Unit Converter

Temperature oC K oF

Length m km in ft yards miles naut miles

Area m2 km2 in2 ft2 miles2 acres

Volume m3 liters in3 ft3 us gal

Weight kgf N lbf

Velocity m/s km/h ft/min ft/s mph knots

Pressure Pa bar atmosphere mm H2O kg/cm2 psi inches H2O

Flow m3/s m3/h US gpm cfm

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