Valve Selection Flow

An interactive guide for students

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Type of Service

Clean Dirty

Line Size

Line Size < 6 Inches Line Size > 6 Inches

Flow Rate Requirement

Extremely High Regular

Explore Segmented Ball / Plug Valves (For Lower D.P values) i.e. D.P < 10 Bar.

Cavitation Index (Sigma)

What is the Cavitation Index?

Sigma > 2 1.7 to 2 1.5 to 1.7 1 to 1.5 Sigma < 1

Globe Valve

Globe Valve with Hard Faced Trim

Globe Valve with Single Stage Trim

Globe Valve with Multi Stage Trim

Globe Valve with Flashing Precautions

Differential Pressure

D.P < 10 Bar D.P > 10 Bar

Butterfly Valve Design.

Flow Capacity

Regular Capacity Extremely High

Cavitation Index (Sigma)

What is the Cavitation Index?

Sigma > 2 1.7 to 2 1.5 to 1.7 1 to 1.5 Sigma < 1

Globe Valve

Globe Valve with Hard Faced Trim

Globe Valve with Single Stage Trim

Globe Valve with Multi Stage Trim

Globe Valve with Flashing Precautions

Cavitation Index (Sigma)

Sigma > 2 Sigma < 2

Segmented Ball / Plug Design can be used.

Special Consultation is required (Anti Cavitation Ball Valve Design as per vendor recommendation).

Dirty Service Type

Small Particles (< 19 mm) Large Particles (> 19 mm) Fluid with Fibers Slurry (Highly Viscous)

Differential Pressure

D.P. < 10 Bar D.P. > 10 Bar

Segmented Ball Valve Design Or Globe (With Vendor Recommendation)

Globe Valve with Special Dirty Service Trim (Example: Notchflo)

Differential Pressure

D.P. < 10 Bar D.P. > 10 Bar

Segmented Ball Valve Design or Globe Valve (As per Controllability).

Angle Valve Design

Segmented Ball Valve Design (It is an industry wide choice for Fluids with Fiber

Pinch Valve (Diaphragm Type Valve) is the best industry standard