HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic...

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Military Production Ministry Training Sector HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valves January 2013 Eng. Ahmed Saeed Eladly http//:ASEladly.webs.com

Transcript of HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic...

Page 1: HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic Directional Control Valves.pdf · HYDRAULIC AND PNEUMATIC SYSTEM Directional Control

Military Production MinistryTraining Sector

HYDRAULIC AND PNEUMATIC SYSTEMDirectional Control Valves

January

2013

Eng. Ahmed Saeed Eladlyhttp//:ASEladly.webs.com

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Hydraulic SystemDIRECTIONAL CONTROL VALVES

Actuators Section

Power Control

Slide2Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

Control Section

Power Supply Section

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Hydraulic D.C.VDIRECTIONAL CONTROL VALVES

Slide3Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Hydraulic SystemDIRECTIONAL CONTROL VALVES

Slide4Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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Hydraulic SystemDIRECTIONAL CONTROL VALVES

Slide5Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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Hydraulic SystemDIRECTIONAL CONTROL VALVES

Slide6Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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No. of Positions

2/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

2

2=

No. of Ports

Slide7Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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No. of Positions

3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

3

2=

No. of Ports

Slide8Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide9Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with slide principle( closed position)

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide10Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with slide principle( Opened position)

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide11Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with slide principle( closed position)

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide12Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with slide principle( opened position)

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide13Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with Poppet principle( closed position)

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3/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide14Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

3/2 D.C.V with Poppet principle( Opened position)

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Spool valve advantagesDIRECTIONAL CONTROL VALVES

The main advantage of spool valves is that fluid entering the valve from any working port does not affect spool movement. The poppet in a poppet valve can have pressure on one side and only a light spring on the other. This can result in premature movement of the poppet when pressure enters a port. In a spool valve, pressure always is applied to two equal opposing areas or the edge of a land. Thus pressure forces

Slide15Eng. Ahmed Saeed Eladly

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two equal opposing areas or the edge of a land. Thus pressure forces that could move the spool are cancelled or non-existent. This means that a spool valve can be shifted manually, electrically, mechanically, pneumatically, or hydraulically with the same force regardless of the operating pressure. Low-force solenoids can be used because the most they need to overcome is mechanical friction and light springs

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Spool valve disadvantagesDIRECTIONAL CONTROL VALVES

Many spool valves are designed with metal-to-metal sliding fits. As a result, some fluid may bypass these seals. If this happens, an actuator may not hold its position if outside forces are applied. It also means wasted energy and resulting heat. (Many pneumatic valves use some sort of resilient seal in the body and/or on the spool to eliminate air leaks.) To reduce bypass, spool valves have land overlap, so as they

Slide16Eng. Ahmed Saeed Eladly

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leaks.) To reduce bypass, spool valves have land overlap, so as they start shifting to open a flow path, there is a delay before fluid starts flowing. The delay only lasts for milliseconds and does not cause a problem -- unless the cycle is very fast and/or there are several valve shifts per cycle.

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Spool valve disadvantagesDIRECTIONAL CONTROL VALVES

Another time delay occurs when a spool shifts to the end of its stroke. There is often more movement than required for the flow needed. When the spool shifts back to center or to the opposite flow path, it consumes more time to travel the extra distance. This slows the cycle, especially when several valves are involved. Stroke limiters that control maximum spool movement can eliminate this delay, but are seldom

Slide17Eng. Ahmed Saeed Eladly

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maximum spool movement can eliminate this delay, but are seldom seen in actual practice. The common fix for these problems is to speed up traverse time by installing a larger pump. However, faster actuator movement can add shock and heat due to higher energy input.

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

No. of Positions

4

2=

No. of Ports

Slide18Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide19Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/2 D.C.V with two pistons principle

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide20Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/2 D.C.V with two pistons principle

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide21Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/2 D.C.V with three pistons principle

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide22Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/2 D.C.V with three pistons principle

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

No. of Positions

4

3=

No. of Ports

Slide23Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide24Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/3 D.C.V

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide25Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/3 D.C.V

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4/2 Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide26Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

4/3 D.C.V

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide27Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide28Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide29Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide30Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide31Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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Methods of ActuationDIRECTIONAL CONTROL VALVES

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Slide32Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide33Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide34Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

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Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide35Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

Page 36: HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic Directional Control Valves.pdf · HYDRAULIC AND PNEUMATIC SYSTEM Directional Control

Methods of ActuationDIRECTIONAL CONTROL VALVES

Slide36Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Page 37: HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic Directional Control Valves.pdf · HYDRAULIC AND PNEUMATIC SYSTEM Directional Control

Valve PositionsDIRECTIONAL CONTROL VALVES

Normal Position

Primary Position

Slide37Eng. Ahmed Saeed Eladly

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Ref: Festo Hydraulic Manual

Primary Position

Operational Position

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Port LettersDIRECTIONAL CONTROL VALVES

P : PressureT : TankA : First output portB : Second output port

Slide38Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Festo Hydraulic Manual

B : Second output port

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Port LettersDIRECTIONAL CONTROL VALVES

Slide39Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Overlap PositionDIRECTIONAL CONTROL VALVES

Slide47Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Overlap PositionDIRECTIONAL CONTROL VALVES

Slide48Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Mounting valvesDIRECTIONAL CONTROL VALVES

Slide49Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Mounting valvesDIRECTIONAL CONTROL VALVES

Slide50Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Mounting valvesDIRECTIONAL CONTROL VALVES

Slide51Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide52Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Rexroth Hydraulic Manual, Volume 1

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Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide53Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Rexroth Hydraulic Manual, Volume 1

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Directional Control ValveDIRECTIONAL CONTROL VALVES

Slide54Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Ref: Rexroth Hydraulic Manual, Volume 1

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ActivityDIRECTIONAL CONTROL VALVES

Interpret the given hydraulic valve symbols

Slide55Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

Page 56: HYDRAULIC AND PNEUMATIC SYSTEM Directional Control Valvesmadiadly.webs.com/Hydraulic/Hydraulic Directional Control Valves.pdf · HYDRAULIC AND PNEUMATIC SYSTEM Directional Control

ActivityDIRECTIONAL CONTROL VALVES

Design a hydraulic circuit to control the forklift

Slide56Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com

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THE ENDDIRECTIONAL CONTROL VALVES

Slide57Eng. Ahmed Saeed Eladly

http//:ASEladly.webs.com