# Control valve calculator

## Registration and subscription

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Action
Calculation setup
Flow rates and velocity
Coefficients and pressure drop
Fluid properties

# Calculator description

Read more about calculator application and check if calculator is suitable for your problem.

Also, read about calculation procedures, what you have to know for the calculations and what limitations apply.

# Registration and subscription

Subscribed users have access to the full service which includes:

• One click switch from metric to imperial units
• Export results in word or excel format
• Preview, copy and paste results from a web page to your text editor
• Send results to you email

## Calculator start selection

Read all about available deployments. In any way of utilizing calculator, Internet connection is required, for authentication at least.

## Issues and answers

Having problems with calculators usage? Read more about known issues and problems and way to solve it.

#### Description

q - volumetric flow rate
Fluid flow rate in terms of units of volume per unit of time
ṁ - mass flow rate
Fluid flow rate in terms of units of mass per unit of time
V - velocity
Flow velocity in terms of units of distance per unit of time
D - internal diameter
Internal circular pipe diameter
Cv - flow coefficient
In imperial units - gpm
Kv - flow coefficient
In metric units - m3/h
p - pressure
Fluid pressure at the start of the pipe for gas density calculation based on the ideal gas state equation
ρ - fluid density
Mass per unit of volume

#### Calculation setup

Select value to calculate. You should enter not selected one.
q/ṁ
Calculate flow rate
Δp
Calculate pressure drop
Cv/Kv
Calculate flow coefficient
Select value to input. You should enter selected one. The other one will be calculated
q
volumetric flow rate
mass flow rate
Select value to input. You should enter selected one. The other one will be calculated.
Cv
flow coefficient in imperial units - gpm
Kv
flow coefficient in metric units - m3/h
Select value to input. You should enter selected one. The other one will be calculated.
v
flow velocity
D
internal pipe diameter