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Flow Calculators

These Flow Calculators for Balon Regular Port Valves in liquid or in gas service are provided for your convenience by Balon Corporation.

Begin by looking up the Flow Coefficient (Cv) for your Balon regular port ball valve on the corresponding product page in Balon's current product catalog. Flow Coefficients can be found in the Cv Column within the ball valve Dimensional Data Tables. You may also open the equivalent valve product pages on this website.

Enter the data requested below. After entering all data, click "CALCULATE." The calculated pressure drop (Δp) will appear, expressed in pounds per square inch (PSI).

CAUTION: Be aware that excessive pressure drop can cause problems including but not limited to high velocity, noise, cavitation, and erosion.

THESE TOOLS ARE PROVIDED SOLELY FOR PURPOSES OF COMPARISON AND ARE OFFERED WITHOUT ANY WARRANTY WHATSOEVER. BALON DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. These tools do not take into account all factors that can influence the actual change in pressure that a user may experience under field conditions. As such, actual pressure drop experienced under field conditions may be significantly different than the value(s) calculated using these online tools. Therefore, these tools should not be used for system design or as a means of determining actual performance.

Flow Calculations for Balon Regular Port Ball Valves in Liquid Service

Specific Gravity(SG) =
Flow, in GPM(U.S. Gallons per Minute) =
Flow Coefficient(Cv) =
Δp =


Flow Calculations for Balon Regular Port Ball Valves in Gas Service

Flow, in SCFD(Standard Cubid Feet per Day) =
Flow Coefficient(Cv) =
Upstream Pressure(PSIG) =
Ambient Temperature in Farenheit =
Specific Gravity(SG) =
Δp =


Flow Calculations for Balon Regular Port Ball Valves in Liquid Service

Depending upon pipe schedule with which they are used, Balon full bore valves have bore sizes exceeding or nearly equaling the pipe inside diameter. The best method of computing system pressure losses is to consider the valve an equivalent length of pipe.

Using the Cv method of rating full bore valves does not provide good accuracy. The reason for this is that Cv tests do not provide valid data until the measured pressure drop equals at least 2 psi. In the relatively short length involved in a valve, extremely high velocities are required to generate that pressure drop.

At these high velocities (which are well beyond those used in industry), other effects such as vibration and pulsation are then created by "super turbulent" flow. The net results are Cv ratings which are lower than would be derived if pressure losses could be consistently measured at velocities in the usable range.

Cv data for reduced port valves are listed on the product pages.