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

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.

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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 - Flow Coefficient Cv Diagram

Sizing of water control valves - Imperial units.

Water Control Valves - Kv Calculation

Designing water process control valves and their Kv values.

Weir Diaphragm Valves - Flow Coefficients and Flow Factors

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

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