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Asociado certificado

VA-900-3 - Control Valve Selection


Objectives

The objectives of this course are twofold. The first is to review basic control valve selection techniques. The second is to examine the new tools that can help you choose the valves that offer the best performances.

Since the control valve is the element that most affects loop performance, it is crucial to select, operate, and maintain it with great care.

Who should attend

Production and technical personnel who wish to increase their knowledge of control and on-off valves.

Schedule

From 8:30 am to noon and from 1:00 pm to 4:30 pm, every day.

Content

Day 1

  • Sizing
    • Origins of valve sizing
    • Gathering data on service conditions
    • CV calculations
    • Velocity limits
    • Flashing and cavitation
    • Steps to eliminate cavitation
    • Choked flow
  • Noise
    • In liquids
    • In gases and steam
    • Acceptable industry limits
  • Leakage rates and construction limitations
    • Teflon seats vs. metal seats
    • Pressure limitations, ANSI classes
    • Corrosion
  • Valve families
    • Globe vs. rotary
    • Butterfly, eccentric disk
    • Full ball
    • Segmented ball
    • Rotary plug valves
Day 2
  • Performance and characteristics
    • Installed vs. inherent characteristics
    • Gain
    • Linearizing existing installations
  • Actuators
    • Pneumatic, electric, hydraulic - which one to choose?
    • Modulating actuators and on/off actuators
    • Springs and diaphragms
    • Piston
    • Fail position
    • Orientation
  • Positioners and accessories
    • Conventional positioners
    • Intelligent positioners
    • Position switches
    • Travel stops
    • Manual overrides
    • Limit switches
  • Installation and maintenance
    • Proper installation
    • Maintenance
    • Valve sizing software demonstration
Day 3
  • Practical exercises
    • You are invited to bring your own examples
  • Demonstration
    • Demonstration with new intelligent positioners
  • The importance of control valves
    • Process and characteristics
    • Control loops and elements
    • The role of control valves in the loop
    • The Importance of proper selection and use of intelligent positionners
    • Ways to maximize production results
    • Examples from plants
Software used
  • Nelprof 5.0

Please note that each participant must have a laptop computer to attend the course. If you do not have one, we will arrange to rent one for you, at your cost.