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UNIT-V

HYDRAULIC AND PNUMATIC

CIRCUITS

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Hydraulic Circuit

• A hydraulic circuit may be defined as the graphical representation

of the hydraulic components in a hydraulically operated machine.

1).Hydraulic power pack:

It consist of pump drive motor, mechanical couplings, oil reservoir,

strainers, filters, coolers, etc.

)Hydraulic control elements:

!hey include various types of directional control valves, pressure

control valves, flow control valves, electrical control valves.

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Continue…

") #ower drive units or actuators:

!hey are hydraulic cylinders and hydraulic motors.

$) %ystem accessories:

!hey include pipes and other fluid conductors,

accumulators, boosters, pressure and temperaturegauges, filters, etc.

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Control of in!le actin! "ydraulic

cylinder

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Control of dou#le actin! "ydraulic

cylinder

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Re!enerati$e circuit

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Mac"ine tool A%%lication

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Se&uencin! of t'o dou#le actin!

Cylinder

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Auto(atic Cylinder Reci%rocatin!

Syte(

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Pu(% Unloadin! Circuit

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S%eed Control Circuit

  &low control valves are used to control the speed ofhydraulic cylinders

  'ocation of &( with respect to other components

in a circuit will have effect on the characteristics of

the circuit performance  !ypes

1. *eter+in circuit

. *eter+out circuit". leed+off circuit

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Meter-in %eed control of Hydraulic

Cylinder

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Meter-out %eed control of Hydraulic

Cylinder

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)leed o* circuit

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Control of Hydraulic Motor

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Meter in +Pneu(atic Circuit

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Meter +out %neu(aticcircuit

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Control of Pneu(atic (otor

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Sync"roni,ation -Cylinder in Parallel

" i i i i

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Sync"roni,in! circuit-t'o or (orecylinder re&uire %erfect

ync"roni,ation

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 Tie Cylinder +Rac and%inion

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Hydro%neu(atic circuit

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/t"er circuit

Sync"roni,in! circuit

• Matc"in! %u(%

•

.lo' control $al$e• .lo' di$idin! (otor0

.ail afe circuit

.ail afe uin! e(er!ency cut o*$al$e0