Flow Coefficient Calculator

The Flow Coefficient, often denoted as Cv, is a crucial concept in fluid dynamics and engineering. It's a dimensionless unit that represents the flow of a fluid through a valve or other component for a given pressure drop. Understanding and calculating the flow coefficient is vital in the design and operation of various fluid systems like HVAC, water treatment plants, oil and gas pipelines, and many more.

Cv Water Calculator
US gal/m
Flow Coefficient Calculator Results
Flow Coefficient in Liquids (Cv) = gal per minute

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Example Formula

The Flow Coefficient is commonly calculated using the water flow rate (Q), the pressure drop across the valve or component (ΔP), and the specific gravity (G) of the fluid. The standard formula for Flow Coefficient (Cv) is:

Cv = Q × sqrt(G/ΔP)


  1. Cv: Flow Coefficient.
  2. Q: Water flow rate (in gallons per minute).
  3. G: Specific Gravity of the fluid (for water G=1).
  4. ΔP: Pressure drop across the valve or component (in psi).

Who wrote/refined the formula

The concept of the Flow Coefficient and its calculation have been developed over time by several researchers and engineers in the field of fluid dynamics. While it is difficult to attribute it to a single person, the formula is a standard in the industry, used universally for sizing and selecting valves and other components in fluid systems.

Real Life Application

The calculation of the Flow Coefficient is vital in many engineering applications, particularly in designing and optimizing fluid systems. For example, in HVAC systems, the Flow Coefficient is used to size the valves and pumps correctly, ensuring that the system operates efficiently and delivers the right amount of heating or cooling.

Key individuals in the discipline

While it's challenging to attribute the Flow Coefficient formula to specific individuals, many have significantly contributed to fluid dynamics, including Bernoulli, Reynolds, and Navier-Stokes. Their work has been instrumental in understanding fluid behavior, which is the foundation of concepts like the Flow Coefficient.

Interesting Facts

  1. The Flow Coefficient is a vital factor in industries like HVAC, water treatment, oil and gas, and even in the food and beverage industry.
  2. The calculation of the Flow Coefficient has led to more efficient designs of fluid systems, saving energy and reducing the environmental impact.
  3. The concept of the Flow Coefficient has contributed significantly to the field of fluid dynamics, enabling more accurate predictions and control of fluid behavior.


Understanding the Flow Coefficient and its calculation based on water flow rate, specific gravity, and pressure drop is essential in many fields, particularly in fluid dynamics and engineering. This dimensionless unit has a significant impact on the design and operation of a variety of fluid systems, contributing to more efficient and sustainable operations.

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