S.M. Taha Rehman Siddiqui Institute of Chemical Engineering & Technology University of the Punjab

Valve/ Characteri

stics Globe Valve Gate Valve

Diaphragm Valve

Butterfly Valve

Ball Valve Plug Valve Needle Valve Check Valve

Pinch Valves Solenoid Valves

Diagram

Symbol

Motion Linear Motion Linear

Motion Linear

Motion Rotary Motion

Rotary Motion Rotary Motion Linear

Motion

Depends upon

Stopping Element

Linear Motion

Linear Motion

Pressure Drop

High Less than

Globe

Very Low Resistance

to Flow Low Low

Very Little Resistance to

Flow Low Low ΔP

Very Low Resistance

to Flow N/A

S.M. Taha Rehman Siddiqui Institute of Chemical Engineering & Technology University of the Punjab

Throttle Recommended Maybe but not suitable

Primarily it is a

Throttling Valve; Can

be Used as Stop

Valve

Can be Used for Throttling

(Fluid Should be Non-Abrasive)

Not recommended for throttling

Can be used N/A Fully

Open or Closed

Control Element

Disc Gate Diaphragm Disc Ball Plug Gate/Needle Disc/Ball/Lift Check

Polymer Gate

Coefficient of Valve

Cv Low

High as No constriction

in Flow High

N/A, As Shut On/Off Valve

Operating Time

Not suitable for quick operation.

Not suitable for quick

operation.

Not suitable for

quick operation.

Circular disc used for

quick opening/clo

sing

Quarter Turn Valve. Quick

Opening/Closing

Quarter Turn Valve. Quick

Opening/Closing

Not suitable for quick

operation.

Quick Opening as only flow is

require to open

Not suitable for quick

operation.

Electric Operated.

Quick Shut

Off/On

Operating Limitation

(T/P)

High Pressure usage

Not recommended for high pressure

Temperature Limitations in

Lined and Soft Seated

Valves

Temperature Limitations When Seat Ring is Non-

Metallic

Used for both

high/low pressure

N/A

Operating Limitation (Materials)

Not Recommended for Dirty Fluids

or Slurries

Use Anywhere

Can be used for all types of fluid and

Slurries

Not suitable for

crystallizing and caking

medium

Almost all Fluids and Slurries can

be handled

Almost all Fluids and Slurries can

be handled

Not Recommended for Dirty Fluids

or Slurries

Slurry Material

could stuck to

seat