Control Valves
Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
ASTM A216 Valves - Pressure Ratings vs. Temperature
Pressure and temperature ratings for cast carbon steel valves.
Ball Valves - Flow Coefficients Cv
Flow coefficients - Cv - for typical ball valves - reduced and full bore.
Butterfly Valves - Flow Coefficients Cv
Typical flow coefficients - Cv - for butterfly valves.
Butterfly Valves - Sizing and Selection
Selecting and sizing butterfly valves for water applications.
Control Valves - Adding Flow Coefficients for Valves in Series or Parallel
How to add flow coefficients for control valves in series or parallel.
Control Valves - Cavitation
Control valves and cavitation, application ratio and multi stage control valves.
Control Valves - Flow Characteristics
Flow capacities vs. stem opening.
Control Valves - Leakage Classification
Seat leakage classification through control valves.
Control Valves - Sizing and Selection
Sizing control valves to match process requirements.
Control Valves for Liquids - Sizing Calculator
Online control valve - Cv - calculator for liquids flow.
Flow Coefficient Cv vs. Flow Factor Kv
Comparing flow coefficients Cv to flow factors Kv.
Gases - Control Valve Calculator
An online control valve - Cv - calculator for gases.
Gases - Specific Gravities
Specific gravities of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases.
Liquid, Steam and Gas - Flow Coefficients Cv
Calculate flow coefficients for the design of control valves - Imperial units.
Liquid, Steam and Gas - Flow Factor Kv
Calculate flow factor Kv for liquids, steam and gases - metric units.
Liquids - Critical Pressure Ratios
Critical pressure ratios for water and other liquids.
Metals - Corrosion Resistance to Aggresive Fluids
Common metals and their corrosion resistance to aggressive fluids like acids, bases and more.
Process Controllers - P, PI & PID
Proportional, integrating and derivative process controllers.
Steam Control Valves - Calculate Flow Factor Kv
Designing steam control valves and their Kv values.
Steam Control Valves - Sizing
Calculate control valves in steam systems.
Steam Safety Valves - Installation Guide
Guidelines to safety steam valves installation.
Straight Through Diaphragm Valves - Flow Coefficients
Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.
Valve Authority
The valve authority expresses the ratio between pressure drop across the control valve compared to total pressure drop across the whole system.
Valve Selection Guide
Applications guide for selecting valves.
Valves - Fail-Closed (FC)
A control valve that goes to closed position if control signal or air fails.
Valves - Fail-Last (FL)
A control valve that should stay put if control signal or air fails.
Valves - Fail-Open (FO)
A control valve that goes to open position if control signal or air fails.
Valves - Normally Closed (NC)
Valves and the term Normally Closed.
Valves - Normally Open (NO)
Valves and the term Normally Open.
Valves - Specific Services
In case of a specific service - the choose of a valve may be simplified by following an established practice.
Valves - Typical Operating Temperatures
Operating temperatures for typical categories of valves - ball valves, butterfly valves and more.
Valves Types - Operating Size Ranges
Types of valves and their typical operating sizes.
Water Control Valves - Flow Factor Kv Diagram
Sizing of water control valves - SI units
Water Control Valves - Kv Calculation
Designing water process control valves and their Kv values.
Water Control Valves - Flow Coefficient Cv Diagram
Sizing of water control valves - Imperial units.
Weir Diaphragm Valves - Flow Coefficients and Flow Factors
Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.