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8/7/2019 VALVES TYPE & FUNCTION(2)
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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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