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Valve Selection 

  • Valves isolate, switch, and control fluid flow in piping systems
  • Can be operated manually (using levers or gear operators) or remotely (using electric, pneumatic, electro-pneumatic, and electro-hydraulic powered actuators). 
  • Manual valves are usually used only if they will be operated infrequently or no power source is available. 

Basic Valve Types 

 Isolation valves: on/off valves 

  • Typically operated as fully open or fully closed 
  • Designed to have a tight reliable seal during shut-off and minimal flow restriction when open 
Switching valves: converge or divert flow in a piping system 
Control valves: used to modulate flow (i.e., vary flow by opening or closing by a certain percentage)