ElectricValve Actuators
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Products Valve Choice Company Info User Manuals Brochures Ordering
Enter your values in the boxes that are labeled in red. 
Choose the specific gravity for the type of gas you are using from the drop down box. 
If the gas you are using is not listed, then choose a gas with a specific gravity that is close to it.
Click the "calculate" button and the minimum allowable Cv for the conditions you have specified will be calculated, along with D P. 
If necessary, change individual values and click "calculate" again . 
Click the reset button to start over. 
You can use the Tab key to move from box to box. 

Flow (standard L/min)

Inlet Pressure (BarA)
(1 Bar = 100 kPa = 14.5 PSI)

Outlet Pressure (BarA)

Specific Gravity
(relative to air at 20 °C)

Temperature (°C)

D P

Minimum allowable Cv