VALVEVALVE

Preliminary knowledgePreliminary knowledge

ContentContent

I.I. Introduction to valveIntroduction to valve

II.II. Basic parts of a valveBasic parts of a valve

III.III. Valve classificationValve classification

I - Introduction to valveI - Introduction to valve

DefinitionDefinition Application Application FunctionFunction

DefinitionDefinition

ApplicationApplication

TransportationTransportation ResidentialResidential Industrial:Industrial:

Oil and gasOil and gas Power generationPower generation MiningMining Water supplyWater supply SewerageSewerage Chemical Chemical

manufacturingmanufacturing

FunctionFunction

Stopping and starting fluid flowStopping and starting fluid flow Varying the amount of fluid flow Varying the amount of fluid flow

(throttling)(throttling) Controlling the direction of fluid flowControlling the direction of fluid flow Regulating downstream system or Regulating downstream system or

process pressureprocess pressure Relieving component or piping over Relieving component or piping over

pressurepressure

II - Basic parts of a valveII - Basic parts of a valve

1.1. BodyBody

2.2. BonnetBonnet

3.3. StemStem

4.4. ActuatorActuator

5.5. PackingPacking

6.6. SeatSeat

7.7. DiskDisk

1, 2. Body and Bonnet1, 2. Body and Bonnet

Material:Material: BrassBrass BronzeBronze Cast ironCast iron SteelSteel Stainless steelStainless steel Alloy steelsAlloy steels Plastic (PVC, PP, Plastic (PVC, PP,

PVDF, Glass-PVDF, Glass-reinforced nylon)reinforced nylon)

3. Stem3. StemRISING STEM

NONRISING STEM

4. Actuator4. Actuator

HandwheelHandwheel Manual leverManual lever Motor operatorMotor operator Solenoid operatorSolenoid operator Pneumatic operatorPneumatic operator Hydraulic operatorHydraulic operator

5. Packing5. Packing

6. Seat6. Seat

Seat meterial:Seat meterial: Metal or plasticMetal or plastic PTFE or other ElastomerPTFE or other Elastomer

Hard seat

Soft seat

7. Disc7. Disc

III - Valve ClassificationIII - Valve Classification

1.1. Globe valveGlobe valve2.2. Gate valveGate valve3.3. Ball valveBall valve4.4. Plug valvePlug valve5.5. Butterfly valveButterfly valve6.6. Diaphragm valveDiaphragm valve7.7. Check valveCheck valve8.8. Pinch valvePinch valve9.9. Safety valveSafety valve

Gate valveGate valve

Globe valveGlobe valve

Other body designs ofOther body designs ofGlobe valveGlobe valve

Y-bodyAngle body

Ball valveBall valve

Plug valvePlug valve

Diaphragm valveDiaphragm valve

Pinch valvePinch valve

Butterfly valveButterfly valve

Needle valveNeedle valve

Check valveCheck valve

Swing check valve

Tilting-disc check valve

Check valveCheck valve

Lift check valve Piston check valve

Check valveCheck valve

Butterfly check valve Stop check valve

Relief and safety valvesRelief and safety valves

Relief valve Safety valve

SummarySummary

Gate valves:Gate valves: Low flow resistanceLow flow resistance Fully open valveFully open valve No good in throttlingNo good in throttling

Globe valves:Globe valves: Good throttling characteristicsGood throttling characteristics Low seat leakageLow seat leakage Relatively high head loss in an open valveRelatively high head loss in an open valve

Ball valves:Ball valves: Quick, quarter turn on-off operationQuick, quarter turn on-off operation Have poor throttling characteristicsHave poor throttling characteristics

Plug valves:Plug valves: Direct flow between several different ports through use of a Direct flow between several different ports through use of a

single valvesingle valve

SummarySummary

Diaphragm valves and pinch valves:Diaphragm valves and pinch valves: The entire operating mechanism to be completely The entire operating mechanism to be completely

isolated from the fluidisolated from the fluid Butterfly valves:Butterfly valves:

Significant advantages in weight, space, and cost Significant advantages in weight, space, and cost for large valve applicationsfor large valve applications

Check valves:Check valves: Automatically open to allow flow in one direction Automatically open to allow flow in one direction

and seat to prevent flow in the reverse directionand seat to prevent flow in the reverse direction Safety/relief valvesSafety/relief valves

Provide automatic overpressurization protectionProvide automatic overpressurization protection

See you soonSee you soon