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Mon May 20, 2013 07:25:23 AM
Short Desciption:
A Control Valve performs a special task, controlling the flow of fluids so a process variable
such as fluid pressure, fluid level or temperature can be controlled. In addition to controlling
the flow, a control valve may be used to shut off flow. A control valve may be defined as a
valve with a powered actuator that responds to an external signal. The signal usually comes
from a controller. The controller and valve together form a basic control loop. The control
valve is seldom full open or closed but in an intermediate position controlling the flow of fluid
through the valve. In this dynamic service condition, the valve must withstand the erosive
effects of the flowing fluid while maintaining an accurate position to maintain the process
variable.
Summary:
TABLE OF CONTENTS
Introduction
Valve Flow Terminology
The Sizing Process
Operating Conditions
Fluid Properties
Rangeability
Cv and Flow Sizing Formulas
CV Formulas for Liquid Flow
CV Formulas for Vapor Flow
CV Formulas for Two Phase Flow
Flow Velocity Formulas
Flow Velocity for Liquid Flow
Flow Velocity for Vapor Flow
Nomenclature
Conversion to Cg and Cs
Seat Leakage
Actuator Sizing
∆P Tables
Application Guide for Cavitation, Flashing and Compressible Flow Services
Liquid Flow
Cavitation
Cavitation Definition
Cavitation Countermeasures
Application of Warren Trims in Cavitation Service
Cavitation Avoidance
Cavitation Tolerant
Cavitation Containment
Cavitation Prevention
The Cavitation Phenomena
Fluid and Pressure Profiles
Choked Flow and Incipient Cavitation
Cavitation Damage
Flashing
Flashing Definition
Flashing Countermeasures
Body Material
Trim Selection
Application of Warren Valves in Flashing Service
Body Material:
Trim Selection
The Flashing Phenomena
Liquid Flow Velocity - Body Material
Compressible Flow Noise
Compressible Flow Noise Discussion
Compressible Flow Noise Countermeasures
Application of Warren Trims in Compressible Flow Applications
Standard Trims:
Multiple Orifice Trims
Compressible Flow Velocity Limits:
Two Stage Trims and Backpressure Orifices:
The Compressible Flow Noise Phenomena
TABLES
Trim Rangeability Table 1
Fluid Properties Table 2
FL Factors Table 3
Flanged Body Inlet and Outlet Diameters Table 4
Allowable Seat Leakage Classes Table 5
Liquid Flow Velocity Limits Table 6
FIGURES
Cavitation
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"VALVE SIZING SELECTION TECHNICAL REFERENCE"
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