Control Valves

C_v Diagram Water Valves

Water valve C_v diagram

K_v Diagram Water Valves

K_v diagram for modulating water valves

Adding K_v or C_v values

Adding K_v or C_v when control valves are in series or parallel

Control Valve Sizing Calculator - Gases

An online control valve - C_v - calculator for gases

Control Valve Sizing Calculator for Liquids

Online control valve - C_v - calculator for liquids - flow, specific gravity and upstream pressure inputs calculates C_v

Control Valve Sizing Handbook

Masoneilan Control Valve Sizing Handbook - Valve flow characteristics, C_v formulas, materials of construction, body styles and elastomers

Control Valve Sizing for Steam Systems

Calculating steam control valves

Control Valves and Cavitation

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

Control Valves and Flow Characteristics

The relationship between control valve capacity and stem traveling

Fail Closed (FC)

A control valve which should go to closed position on control signal or air failure would be labeled FC

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Fail Last (FL)

A control valve which should stay put on control signal or air failure would be labeled FL

Fail Open (FO)

A control valve which should go to the open position on control signal or air failure should be labeled FO

Flow Coefficient - C_v - Formulas for Liquids, Steam and Gases - Online Calculators

The flow coefficient - C_v - is important for proper design of control valves

Flow Coefficient C_v and Flow Factor K_v

Comparing flow coefficient C_v with flow factor K_v

Flow Coefficients - C_v - and Flow Factors - K_v - of Straight Through Diaphragm Valves

Typical flow coefficients - C_v - and flow factors - K_v - of

Flow Coefficients - C_v - and Flow Factors - K_v - of Weir Diaphragm Valves

Typical flow coefficients - C_v - and flow factors - K_v - of weir diaphragm valves of

Gases - Specific Gravities

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

Leakage Classification of Control Valves

Classification of seat leakages through control valves

Metals and Corrosion Resistance

Common metals and their corrosion resistance to aggressive fluids as acids, bases and more

Normally Closed (NC)

The term Normally Closed

Normally Open (NO)

The term Normally Open

Safety Steam Valve Installation Guide

Guidelines to safety steam valve installation

Sizing and Selection Control Valves

Select and size the control valve that most closely matches the process requirements

Sizing and Selection of Butterfly Valves

Selecting and sizing butterfly valves for water applications

Steam Control Valves - Calculating K_v Values

Design of steam control valves and their K_v values

Valve Authority

Valve authority express the ratio between pressure drop across the control valve compared to the total pressure drop across the whole circuit

Water Control Valves - Calculating K_v Values

Design of water process control valves and their K_v values