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Control Valve Sizing

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

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Typical flow coefficients - Cv - for butterfly valves.

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Selecting and sizing butterfly valves for water applications.

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How to add flow coefficients for control valves in series or parallel.

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Seat leakage classification through control valves.

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Comparing flow coefficients Cv to flow factors Kv.

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Specific gravities of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases.

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Calculate flow coefficients for the design of control valves - Imperial units.

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Calculate flow factor Kv for liquids, steam and gases - metric units.

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Critical pressure ratios for water and other liquids.

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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.

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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.

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Operating temperatures for typical categories of valves - ball valves, butterfly valves and more.

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Types of valves and their typical operating sizes.

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Sizing of water control valves - SI units

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Sizing of water control valves - Imperial units.

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