Control Valve Handbook

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1. Introduction to Control Valves1
What Is A Control Valve?
Process Control Terminology
Sliding-Stem Control Valve Terminology
Rotary-Shaft Control Valve Terminology
Control Valve Functions and Characteristics Terminology
Other Process Control Terminology

2. Control Valve Performance
Process Variability
Economic Results
Summary

3. Valve and Actuator Types
Control Valves
Globe Valves
Rotary Valves
Control Valve End ConnectionsValve Body Bonnets
Control Valve Packing
Characterization of Cage-Guided Valve Bodies
Valve Plug Guiding
Restricted-Capacity Control Valve Trim
Actuators60

4. Control Valve Accessories65PositionersOther Control Valve Accessories
Limit Switches
Solenoid Valve Manifold
Supply Pressure Regulator
Pneumatic Lock-Up Systems
Fail-Safe Systems for Piston Actuators
Electro-Pneumatic Transducers
Electro-Pneumatic Valve Positioners
PC Diagnostic Software

5. Control Valve Selection
Valve Body Materials
Designations for the High Nickel Alloys
Pressure-Temperature Ratings for Standard Class
ASTM A216 Grade WCC Valves
Pressure-Temperature Ratings for ASTM A216 Cast Iron, ASTM B61 and B62 Cast Bronze Valves
Class Designation and PN Numbers
Face–to Face Dimensions
Wear & Galling Resistance Chart Of Material Combinations
Control Valve Seat Leakage Classifications
Class VI Maximum Seat Leakage Allowable
Typical Valve Trim Material Temperature Limits
Service Temperature Limitations for Elastomers
Ambient Temperature Corrosion InformationElastomer Information Fluid Compatibility
Control Valve Flow Characteristics
Selection of Flow Characteristic
Valve Sizing
Sizing Valves for Liquids
Abbreviations and Terminology
Equation Constants
Determining Fp, the Piping Geometry Factor
Determining qmax (the Maximum Flow Rate) or Pmax (the Allowable Sizing Pressure Drop)
Liquid Sizing Sample Problem
Sizing Valves for Compressible Fluids
Determining xTP, the Pressure Drop Ratio FactorRepresentative Sizing Coefficients for Single–Ported
Globe Style Valve Bodies
Representative Sizing Coefficients for Rotary Shaft Valves
Actuator Sizing
Rotary Actuator Sizing
Typical Rotary Shaft Valve Torque Factors
V–Notch Ball Valve with Composition Seal
High Performance Butterfly Valve with Composition SealNon-Destructive Test Procedures
Cavitation and Flashing
Choked Flow Causes Flashing and Cavitation
Valve Selection for Flashing Service, Valve Selection for Cavitation Service
Noise Prediction, Noise Control, Noise Summary
Packing Selection Guidelines

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