Control Valve Characteristics: globe_equal_pct to butterfly_high_performance
Control valve inherent flow characteristics and ISA-75.01 sizing factors — FL, Xt, Fd, rangeability, and inherent characteristic (equal percentage / linear / quick-opening) for globe, butterfly, ball, and rotary control valve types
| valve type | FL (dimensionless) | Fd (dimensionless) | Xt (dimensionless) | inherent characteristic | notes | rangeability (dimensionless) |
|---|---|---|---|---|---|---|
| globe_equal_pct | 0.9 | 0.46 | 0.72 | equal_percentage | Globe single-port cage-guided equal percentage trim; FL=0.90 typical; Xt=0.70-0.75; Fd=0.26-0.67 (size dependent). Rangeability 50:1. Standard workhorse control valve. | 50 |
| globe_linear | 0.9 | 0.46 | 0.72 | linear | Globe single-port cage-guided linear trim; same FL/Xt as equal pct; inherent char = linear. Rangeability 50:1. | 50 |
| globe_quick_open | 0.9 | 0.7 | 0.72 | quick_opening | Globe quick-open trim; low rangeability (~10:1); used for on/off or pressure relief bypass service. | 10 |
| butterfly_concentric | 0.55 | 0.49 | 0.27 | equal_percentage | Concentric (symmetric) butterfly; high Cv but poor FL and Xt (high noise/cavitation risk). Rangeability 25:1. FL=0.50-0.60 full-open. Xt=0.19-0.35. | 25 |
| butterfly_high_performance | 0.68 | 0.35 | 0.42 | equal_percentage | High-performance (eccentric disk/offset shaft) butterfly; better FL and Xt than concentric; tighter shutoff (ANSI Class IV-VI). Rangeability 35:1. | 35 |
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