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