ENGINEERING MANUAL OF AUTOMATIC CONTROL
VALVE SELECTION AND SIZING
431
Contents
Introduction ............................................................................................................ 432
Definitions ............................................................................................................ 432
Valve Components .............................................................................. 432
Valve Flow Characteristics .................................................................. 432
Valve Flow Terms ................................................................................ 433
Valve Ratings ...................................................................................... 433
Valve Types ......................................................................................... 434
Valve Material And Media .................................................................... 436
Valve Selection ............................................................................................................ 436
Globe Valve ......................................................................................... 437
Ball Valve ............................................................................................. 437
Butterfly Valve ..................................................................................... 437
Two-Way Valve .................................................................................... 438
Quick-Opening Valve ...................................................................... 438
Linear Valve .................................................................................... 439
Equal Percentage Valve .................................................................. 439
Three-Way Valves ............................................................................... 440
Mixing Valve .................................................................................... 440
Diverting Valve ................................................................................ 441
Valve Sizing ............................................................................................................ 441
Water Valves ....................................................................................... 441
Quantity Of Water ........................................................................... 442
Water Valve Pressure Drop............................................................. 443
Water Valve Sizing Examples ......................................................... 443
Steam Valves ...................................................................................... 445
Quantity Of Steam .......................................................................... 445
Steam Valve Pressure Drop ............................................................ 447
Proportional Applications ............................................................ 447
Two-Position Applications ........................................................... 447
Steam Valve Sizing Examples ........................................................ 447
Valve Selection
and Sizing
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