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Process Control Valves

Objectives

  • Recognize a process control valve by sight and by process schematic symbol.
  • Identify the purpose of a process control valve.
  • Review open-close valve is so common.
  • Identify proportional valves and explain their characteristics.
  • Examine hydraulic actuation.

What Does A Valve Do?

Process valves usually do one of two things; they regulate the amount of flow, or the direction of flow passing through them.

Non-Proportional Valve Types

Ball valves, plug valves and butterfly valves are very common process control valves. They are relatively inexpensive and reliable.

These valves all serve the same basic purpose of allowing or cancelling flow, but they are designed to function at different pressures.

Low
Pressure
Butterfly Valve
Ball Valve
Plug Valve
High
Pressure

Butterfly Valve Characteristics

  • Butterfly valves are relatively inexpensive.
  • They are lighter than many other valve types.
  • Their simple disc system minimizes the extra cavities and pockets that could trap slurry.
  • They are simple to automate.

Ball & Plug Valves

Ball valves can withstand more pressure than butterfly valves.

Plug valves are even stronger. They are used to control extreme pressure.

Both valve styles are excellent for use as a quick shutoff valve.

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Vacuum Pressure
Atmospheric Pressure
Low Pressure
Medium Pressure
High Pressure
Ground/Common
Lowest Voltage
Medium Voltage
Highest Voltage
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