Type Of

GLOBE

GATE

Service

Best Suited

Linear & Equal Percentage

Quick Opening

Best Control Advantages

Good sealing, Efficient
throttling, Precise flow control,
Available in multiple ports,
Good rangeability

High Capacity , Tight Shut Off , Low Cost , Little Resistance to Flow

Disadvantages

High pressure drop,
More expensive than others,
than others, Low noise trim
reduces capacity

Poor Sealing Characteristic

Sealing Method

Disk motion is perpendicular
to valve seat. Only contact
is in fully closed position

Gate face slides paralel to the seat surface . Gate and seal in constant shear contract.

Recommendation

Throttling service Flow r
regulation Frequent operations

Fully Open / Closed                    Non throttling or infrequent operation

Applications

Liquid, Vapors, Gases,
Corrosive Substances, Slurries.

Oil, Gas, Air, Slurries , Heavy
Liquid, Steam, Non-Condesing Gases & Corrosive Liquids

Type Of

PLUG ( BALL)

BUTTERFLY

Service

Best Suited

Quick  Opening , Linear

Modulation

Best Control Advantages

Compact desing low cos Low leakage & maint. High capacity,
Lightweight, Good rangeability Tight shutt-off

Light, economical specially
for large size, Minimal pressure
loss, High throughput capacity,
Smaller shaft and actuator

Disadvantages

Poor throttling, Limited T range
with resillent seats,
Choke flow & Cavitation problems,
Requires removal maintenance.

Poor sealing, Good control up to
60 deg opening, Tight shutt-off
requires special lining, plus      over-sized shaft & actuators, Lining imposes T limitation

Sealing Method

Radial seal shaped to conform
with ball surface

Throttle blade is mashed into
mated seal

Recommendation

Fully Open / Closed
limited throttling.

Operating torque is high so high
actuator should ensure

Applications

Most Liquids, high Temperature,
Most suitable for handling slurries,
Not for service with higly
corrosive fluids. 

Low pr applications Liquid, gases,
slurries, liquid with suspended
solids.