Date post: | 17-Nov-2015 |
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VALVES TYPE & FUNCTIONVALVES
ValvesOn-Off ServiceThrottling (Regulating) ServicePrevention of back flowPressure control (Control Valve)
ON OFF SERVICE
Gate valve.
Gate Valve :-ON Off Valve ,Used in:1-Water.2- Oil.3- Gas4- SteamAnd Other Fluid Services.
Wedge gate valve and parallel slide valve
Gate valve 2.
Plug valve (on-off) or Cock low-pressure
Plug valve (on-off) or Cock
Plug valve ApplicationsGas and liquid fuelWater. Extreme temperature flow Boiler feed water.Low Pressure Steam .Corrosive Liquids and Gases
Ball Valve (on-off)
Ball Valve Quarter-TurnHydraulic systems .Water .Air.Oil .Petrochemical .High volume, high pressure and high temperature flow .
THROTTLING(Regulating) SERICE
Globe Valve (High pressure & value )
Globe Valve.
Globe Valve Ops.
Needle ValveFine accurate flow Cont.
Butterfly Valve Flow ControlLow SpeedBoth Side flow
Butterfly Valve 2
Prevention of back flow
split disc check
Split disc check valve operation
lift check valve (Recommended forVapor service)
Swing check valve (liquids)installed horizontal & vertical
Swing check valve Ops.
Piston check valves
check valves
Ball check valve (for heavy fluids) installed horizontal ,vertical & angle
Check valve (Ball)
Pressure Relive valves
safety valves and relief valvesSafety valves are primarily used with compressible gases and in particular for steam and air services .Relief valves are commonly used in liquid systems
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.
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.
Pressure Relieve valve (safety valve) for clean airReleases excess pressure (clean air)
Safety valve - liquid applications, opens in proportion to the
Typical examples of safety valves used on steam & Air systems
pneumatic pressure reducing
Control system would normally consist of the following components:
Control valves.Actuators.Controllers.Sensors.
Globe Valve.
Valve positions
Orifice plate
pressure gauge