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VALVES TYPE&

FUNCTION

Olefins operationdepartment

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Valves

On-Off Service

Throttling (Regulating) Service

Prevention of back flow Pressure control (Control Valve)

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ON OFF

SERVICE

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Gate valve.

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Gate Valve :-

ON Off Valve ,Used in:

1-Water.

2- Oil.

3- Gas

4- Steam

And Other Fluid Services.

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Wedge gate valve and parallel

slide valve

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Gate valve 2.

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Plug valve (on-off) or Cocklow-pressure

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Plug valve (on-off) or Cock

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Plug valve Applications

Gas and liquid fuel

Water.

Extreme temperature flow Boiler feed water.

Low Pressure Steam .

Corrosive Liquids and Gases

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Ball Valve (on-off)

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Ball Valve Quarter-Turn

Hydraulic systems .

Water .

Air. Oil .

Petrochemical .

High volume, high pressure and high

temperature flow .

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THROTTLING

(Regulating)SERICE

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Globe Valve

(High pressure & value )

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Globe Valve.

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Globe Valve Ops.

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Needle Valve

Fine accurate flow Cont.

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Butterfly Valve

Flow Control

Low Speed

Both Side flow

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Butterfly Valve 2

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Prevention of

back flow

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split disc check

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Split disc check valve

operation

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lift check valve (Recommended forVapor service)

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Swing check valve (liquids)

installed horizontal & vertical

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Swing check valve Ops.

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Piston check valves

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check valves

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Ball check valve (for heavy fluids)

installed horizontal ,vertical & angle

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Check valve (Ball)

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Pressure

Relive valves

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safety valves and relief valves

Safety valves are primarily used with

compressible gases and in particular for

steam and air services .

Relief valves are commonly used in liquid

systems

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Pressure Relief Valves

Releases excess pressure to protect system. Use with Gases & Vapors & liquid.

Open Full at once at set pressure.

Outlet port larger than inlet port. Never adjust whilst in service.

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Type of Pressure Relief Valve

Safety valve :Used with compressible gases .steam and air services .

Relief valve : Used in liquid systems. as pressure overspill devices .

Safety relief valve : used either for liquid or compressible fluid.

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Pressure Relieve valve (safetyvalve) for clean air

Releases excess pressure (clean air)

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Safety valve - liquid applications,

opens in proportion to the

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Typical examples of safety valves

used on steam & Air systems

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pneumatic pressure reducing

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Control system would normally consist of the

following components:

Control valves.

Actuators.

Controllers. Sensors.

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Globe Valve.

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Valve positions

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Orifice plate

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pressure gauge

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