ENGINEERING MANUAL OF AUTOMATIC CONTROL
VALVE SELECTION AND SIZING
427
CONTENTS
Valve Selection and Sizing
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Introduction ............................................................................................................ 428
Definitions ............................................................................................................ 428
Valve Components .............................................................................. 428
Valve Flow Characteristics .................................................................. 428
Valve Flow Terms ................................................................................ 429
Valve Ratings ...................................................................................... 429
Valve Types.......................................................................................... 430
Valve Material and Media .................................................................... 431
Valve Selection ............................................................................................................ 432
Globe Valve ......................................................................................... 433
Ball Valve ............................................................................................. 433
Butterfly Valve...................................................................................... 433
Two-Way Valve .................................................................................... 434
Quick-Opening Valve....................................................................... 434
Linear Valve..................................................................................... 434
Equal Percentage Valve .................................................................. 435
Three-Way Valves................................................................................ 436
Mixing Valve .................................................................................... 436
Diverting Valve ................................................................................ 436
Valve Sizing ............................................................................................................ 437
Water Valves........................................................................................ 437
Quantity of Water ............................................................................ 438
Water Valve Pressure Drop ............................................................. 438
Water Valve Sizing Examples ......................................................... 439
Steam Valves....................................................................................... 441
Quantity of Steam ........................................................................... 442
Steam Valve Pressure Drop ............................................................ 442
Proportional Applications ............................................................ 442
Two-Position Applications ........................................................... 442
Steam Valve Sizing Examples......................................................... 443
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