Download - Valves comparison
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