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 Sizing - Steam Systems

Calculate control valves in steam systems

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 Kv or Cv values

Kv or Cv for control valves in series or parallel

Control Valves - Sizing and Selection

Size and select control valves to match process requirements

Control Valves and Cavitation

Control valves and cavitation, application ratio and multi stage control valves

Control Valves and Flow Characteristics

Relationship between control valve capacity and stem move

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 versus Flow Factor Kv

Comparing flow coefficient Cv and flow factor Kv

Flow Coefficients - Cv - and Formulas for Liquids, Steam and Gases - Online Calculators

Flow coefficient and proper design of control valves - Imperial Units

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-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

Steam Control Valves - Calculating Kv Values

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 GuideĀ 

An applications guide for selecting valves

Water and Liquids - Critical Pressure Ratios

Critical pressure ratios for water and other liquids

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

Water Systems - Valves and Kv diagram

Kv diagram for sizing control valves

Weir Diaphragm Valves - Flow Coefficients - Cv - and Flow Factors - Kv

Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves

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