How Do I Select a Control Valve?

http://www.cheresources.com/valvezz.shtml

In order to select a valve, you must first know the characteristics of your process medium. Along with that you must understand the physics/dynamics of process control. With all that and alot more you go ahead and select according to:

1. Max operating pressures.

2. Temperatures

3. Explosivity/Flammability/Flash Points/Volatility

4. Vapor or Gas or Liquid

5. Specific Gravity

6. Reynolds Number

7. Pressure drops/pressure gradients/ location (before or after a pump)

...Just a few and with that in hand you call an expert at Foxboro, Fisher, Vulcan, Tri-Clover and they will guide you along the shining path.

Have you looked at GlobalSpec yet? It's a web site that lets you search for products by specification. So, if you look at the "Search by Specification page" for control valves, you can see all of the characteristics. Let me know if you need more help.

http://www.swagelok.com/tools/CV_Calculator.aspx

http://www.butech-valve.com/Cv_calc_appl.htm