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CONTROL VALVE SELECTION
Introduction
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| CONTROL VALVE SELECTION |
A control valve serves as a variable orifice. The variable orifice includes a port and a closure member such as a plug, disk, or ball. In some applications, the closure member of the control valve is in a constant state of motion, responding to continuous changes in the signal from the control system. to ensure proper operation and long life in a throttling application, a control valve must be ruggedly built. The requirement for constant throttling and the heavy-duty construction that is necessary to withstand the rigors of throttling service distinguish control valves from many other valve types. the distinctions between control valves, block valves, and emergency isolation valves.
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Table Of Contents
CONTROL VALVE DEFINITION, FUNCTION, AND NOMENCLATURE
Control Valve Definition
Control Valves Vs. Non-Control Valves
Standard Nomenclature
SPECIFYING REQUIRED CONTROL VALVE PERFORMANCE ATTRIBUTES
ANSI Class Ratings
Pressure Drop Ratings
Material Selection
End Connections
Face-to-Face Dimensions
Flow Capacity
Flow Characteristics
Rangeability
Shutoff Classifications
SELECTING CONTROL VALVE TYPES FOR SPECIFIC SERVICE CONDITIONS
Sliding-Stem Valve Construction Options
Typical Valve Configurations
Rotary-Shaft Valve Construction Options
Butterfly Valves
Full Ball Valve Designs
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CONTROL VALVE SELECTION
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