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Finding the perfect valve

Choosing the right valve requires determining the CV value, max flow, fluid pressure, temperature, media, corrosion resistance and line size. Other factors such as valve availability and cost are just as important. Once you have found your valve from catalogs or other resources, you need to check if it’s available at your budgeted time and cost. Below are the 4 steps to finding the perfect valve.


1. Application - Choose valve type

Gas Media

2. Collect information to calculate CV value:

SG = Specific gravity of gas
p1 = Gas Inlet Pressure
p2 = Gas Outlet Pressure
T = Absolute Temperature
Q = Gas Flow Rate in SCFH

3. Determine CV for Gases

Liquid Media

2. Collect information to calculate CV value:

Q = Flow rate in GPM (US gallons)
G = Specific gravity of liquid
Dp = Pressure drop = inlet - outlet pressure(psi)

3. Determine CV for Liquids



4. Find out if the CV is sized right for your application, consult valve manufacturer’s catalog.


Swagelok’s Integral Bonnet Needle Valve 18 Series

For the SS-18RM8 valve, the CV in the catalog text table is given as CV = 1.8.

This is the max CV on an open valve. If you want to find out your CV related to the number of turns open, you have to use the graph. the CV is approx. = 0.75 when the valve is open at 2 turns.

Find the perfect actuator for your application or industry

Hanbay Inc

Since 2004, Hanbay's advanced, precise and miniature valve actuators have modernized the electric valve actuator market. Today, Hanbay is at the forefront of the valve automation industry, manufacturing electric valve actuators that can be used in any application. Control any valve or pressure regulator with precise rotary or linear automation. Tell us about your valve application. We can automate anything. View ourproduct line.

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