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VALVES TYPES ANDUSAGE/PIPE FITTINGS

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VALVES

DEFINITION

PURPOSE

SELECTION

FUNCTION

TYPES AND USAGE

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DEFINITION

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PURPOSE

Fluid movement must be controlled for a

system to perform effectively

Protect equipment from over pressure

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SELECTION

FLUID

TEMPERATURE

PRESSURE

FLOWRATE

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FUNCTION

STARTING OR STOPPING A FLOW

REGULATING A FLOW

PREVENT BACKFLOW

RELIEVING PRESSURE

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TYPESThere are four types of valve relative

to its function.

Block valve : Start or stop

Control valve : Regulation

Check valve : Prevent Backflow

Relief valve : relieve excessive pressure

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Kinds of valve

There are seven major kinds of valve

relative to its construction

Gate

Globe

Needle

PlugBall

Butterfly

Diaphragm

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Gate Valve

Type : Block Valve

Usage

Straight flow

Free flow is required

Immediate shutoff Minimum pressure drop

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Globe ValveType : control valves

Usage

Throttle

Possible shutoff

Liquid service

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Needle ValveType : control valve

Specialized form of

globe valve

Application

precise throttling metering a very small

flow

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Plug Valve

Type: block valves

control valves

quarter-turn valvesApplication

clean fluids

slurries.

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Ball ValveType :Block valve

control valve

special type of plugvalve

Application

original pipe diameter

must be maintained Low temperature

service

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Butterfly Valve

Type: block valves in

low-pressure services,

seldom used as controlvalves

Application

quarter-turn valve

low-pressure service.

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Diaphragm ValveType control valves

Application

Abrasive or corrosive

materials such as

Slurries

Acids caustic

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Automatic valves

Control Valve

Check Valve

Relief Valve

Safety Valve

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Control Valve Remotely or locally

controlled

Operation of the control

valve is governed by

sensors that detect level,

pressure, temperature

Actuated electrically,pneumatically,hydraulically,

or manually

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Check Valve

Check valves are are

used to prevent a

backflow in a pipingsystem.

Kept open by the flow

of fluid

Close either by gravity

or by reversal of the

fluids forward flow.

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Relief Valve relieve excess pressure

in a system before

piping or equipmentgets damaged

relief valve closes

automatically

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Safety Valve To relieve excess

pressure

Safety valves aredesigned to pop nearly

wide open