Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Process Control Control Valves

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

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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.

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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.

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  • Engineering ToolBox, (2009). Control Valves. [online] Available at: https://www.engineeringtoolbox.com/control-valves-t_45.html [Accessed Day Mo. Year].

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