What are the common types of control valves and their applications?

Globe valve: most common control valve, good throttling capability, uses linear or equal-percentage trim. Ball valve: high capacity, tight shutoff, good for on-off and moderate throttling. Butterfly valve: compact, light weight, good for large lines and moderate control. Three-way valve: mixing or diverting service. Eccentric plug: handles slurries and viscous fluids. Selection factors: pressure drop available, required rangeability, fluid characteristics, shutoff class, and cost. Trim characteristics: linear (flow proportional to stroke), equal percentage (same percentage change per stroke increment), and quick opening (high flow at low stroke).