Hydraulic Power Pack and Hydraulic Symbols

The hydraulic power unit (power supply unit) provides the energy required for the hydraulic installation. Its most important components are
The reservoir (tank) , Drive (electric motor), Hydraulic pump, Pressure relief valve , Filter and cooler.

1. Mohammad Azam Khan
M.Tech.
Industrial & Production
HYDRAULIC
POWERPACK
Symbols 1

2. Mohammad Azam Khan
POWER
PACK
•Thehydraulicpowerunit(powersupplyunit)providestheenergyrequiredforthe
hydraulicinstallation.Itsmostimportantcomponentsare
–The reservoir (tank) ,
–Drive (electric motor),
–Hydraulic pump,
–Pressure relief valve ,
–Filter and cooler.
Symbols 2
•The hydraulic power unit may also act as a carrier for other devices (gauges,
directional control valves).

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HYDRAULIC
SYMBOLS
Symbols 3
Why we need hydraulic symbols?

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M
Symbols 11

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M
Symbols 12

13. Tank
DCV
Filter
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GRAPHICAL REPRESENTATION
OF HYDRAULIC AND PNEUMATIC
ELEMENTS
Symbols 14
•The hydraulic and pneumatic elements such as cylinders and valves are connected
•through pipelines to form a hydraulic or a pneumatic circuit. It is difficult to represent the
•complex functioning of these elements using sketches. Therefore graphical
symbols are
•used to indicate these elements. The symbols only specify the function of the element
•without indicating the design of the element. Symbols also indicate the actuation method,
•direction of flow of air and designation of the ports. Symbols are
described in various
•documents like DIN24300, BS2917, ISO1219 and the new ISO5599, CETOP RP3 and
•the original American JIC and ANSI symbols.

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GRAPHICAL REPRESENTATION
OF HYDRAULIC AND
PNEUMATIC ELEMENTS
Symbols 15
•The symbol used to represent an individual element display the following
characteristics:
–Function
–Actuation and return actuation methods
–Number of connections
–Number of switching positions
–General operating principle
–Simplified representation of the flow path

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GRAPHICAL REPRESENTATION
OF HYDRAULIC AND PNEUMATIC
ELEMENTS
Symbols 16
•The symbol does not represent the followingcharacteristics:
–Size or dimensions of thecomponent
–Particular manufacturer, methods of construction orcosts
–Operation of theports
–Any physical details of theelements
–Any unions or connections other thanjunctions

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SYMBOLS FOR
PORTS
Symbols 17
•Earlier the ports were designated with letter system. Now as per ISO5599
the ports are designated based on number system.

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SYMBOLS FOR
PORTS
Symbols 18

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GRAPHICAL SYMBOLS OF HYDRAULIC
ELEMENTS AND EQUIPMENT
Symbols 19

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GRAPHICAL SYMBOLS OF HYDRAULIC
ELEMENTS AND EQUIPMENT
Symbols 20

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GRAPHICAL SYMBOLS OF HYDRAULIC
ELEMENTS AND EQUIPMENT
Symbols 21

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CIRCUIT SYMBOLS
FOR
Symbols 22

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DIRECTIONAL
CONTROL VALVES
Symbols 23

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DIRECTIONAL
CONTROL VALVES

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4/3 -DIRECTIONAL
CONTROL VALVES

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CIRCUIT SYMBOLS FOR
MANUAL OPERATION
Symbols 26

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CIRCUIT SYMBOLS FOR
MANUAL OPERATION
Symbols 27

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CIRCUIT SYMBOLS FOR
FLOW CONTROL VALVES
Symbols 28

29. CIRCUIT SYMBOL FOR
PRESSURE VALVES
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CIRCUIT SYMBOLS FOR
NON-RETURN VALVES
Symbols 30