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