Valve Selection

The Valve Selection Method is based on some basic criteria.

 

 

1. Determine the Application Criteria

  • Flow type required:
  • Two-way, equal % or modified linear.
  • Three-way, mixing or diverting.
  • Fluid Media (Oil,Gas,Chemicals,Edible product,syrups,Hot water, steam,etc.)
  • Process Temperature.
  • Inlet Pressure required.
  • Output Pressure required.
  • Type of Valve.
  • Material of Construction based on flowing media and temperature.
  • Existing piping or tubing size.

 

2. Determine the Valve Control Form Required

 

  • Manual.
  • Pneumatic.
  • Electrically Actuated.
  • Hydraulically Actuated.

 

3. Determine the Required Cv

 

In case of only flow Rate availability ,Cv calculation is required.

If the size of the valve is predetermined,then Cv caculation is not required.

 

Paramenters for Cv Calculaions:

 

  • Inlet pressure
  • Fluid temperature
  • Fluid specific gravity
  • Fluid flow rate in GPM (liquid) or Fluid flow rate in lbs./hr (steam)