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 Coefficients Cv vs. Flow Factors Kv
Comparing flow coefficients Cv to flow factors Kv.
Gases - Control Valves 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.
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 Selection Guide
Applications guide for selecting valves.
Valves Types - Operating Size Range
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.