Simbolos Hidraulicos.pdf

8/22/2019 Simbolos Hidraulicos.pdf

1/12

ydraulic Schematic Symbols

line Hydraulic's Main Page

asic Symbols

Lines

-continuous line - flow line

-dashed line - pilot, drain

-envelope - long and short dashes around two or more component symbols.

Circular

-large circle -pump, motor

-small circle -Measuringdevices

-semi-circle -rotary actuator

Square

-one square- pressurecontrol

function-two or threeadjacentsquares -directionalcontrol

Diamond

-diamond -Fluidconditioner

(filter,separator,lubricator,heatexchanger)

Miscellaneous Symbols

-Spring

-FlowRestriction

ttp://www.airlinehyd.com/KnowledgeCenter/Symbols.asp (1 of 12)11/15/2005 9:44:31 PM


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Triangle

-solid -Direction ofHydraulicFluid Flow

-open -Direction of

Pnematicflow

Pumps and

Compressors

Fixed Disp lacement hydraulic

pump

-unidirectional

-bidirectional

Variable disp lacement hydraulic

pump

-unidirectional

-bidirectional

Compressor

Motors

Fixed displacement hydraulic

motor

-unidirectional

-bidirectional



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Variable disp lacement hydraulic

motor

-unidirectional

-bidirectional

Pneumatic motor

-unidirectional

-bidirectional

Rotary Actuator

- hydraulic

- pneumatic

Cylinders

Single acting cylinder

-returnedby external

force-returned byspring orextended byspring force

Double acting cylinders

-singlepiston rod(fluid

required toextend andretract)

-doubleendedpiston rod

Cylinders with cushions

- single fixedcushon



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- doublefixedcushion

- singleadjustablecushion

- doubleadjustablecushion

Directional Control Valves

Directional control valve (2 ports /

2 positions)

-Normallycloseddirectionalcontrol valvewith 2 portsand 2 finitepositions.

-Normallyopendirectionalcontrol valvewith 2 portsand 2 finite

positions.


2 positions)

-Normallycloseddirectionalcontrol valvewith 3 portsand 2 finite

positions.-Normallyopendirectionalcontrol valvewith 3 portsand 2 finitepositions.



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2 positions)

-directionalcontrol valvewith 4 portsand 2 finitepostions

Directional control valve (4 ports /3 positions)

-directionalcontrol valvewith 4 portsand 3 finitepostions*-(centerposition canhave various

flow paths)


2 positions) Normally a pneumatic

valve


Directional control valve (5 ports /3 positions) Normally a pneumatic

valve


Proportional directional control

valve

Electro-hydraulic servo valve

-The spool pos itions on these valves is

variable allowing for variable flow

conditions.



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-single-stagedirect

operation

unit whichaccepts ananalogsignal andprovides asimilar

analog fluidpoweroutput

-two-stagewithmechnicalfeedbackindirect

pilot

operation

unit which

accepts ananalogsignal andprovides asimilaranalog fluidpoweroutput

Control Methods

Manual Control

-generalsymbol(withoutshowing thecontrol type)

-pushbutton

-lever

-foot pedal

Mechanical Control

-plunger ortracer



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-spring

-roller

-roller(onedirectiononly)

Electrical Control

-Solenoid(the onewinding)

Pilot Operation

-pneumatic

-hydraulic

Pilot operated two-stage valve

-Pneumatic:Sol firststage

-Pneumatic:Air pilotsecondstage

-Hydraulic:Sol first

stage-Hydraulic:Hyd pilotsecondstage

Check valves, Shuttle valves,

Rapid Exhaust valves

-check valve-free flowonedirection,blocked flowin otherdirection



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-pilotoperatedcheck valve,pilot to close

-pilotoperatedcheck valve,pilot to open

Shuttle valve

-to isolateone part of asystem froman alternatepart ofcircuit.

Rapid exhaust valve/Pneumatic

-installedclose to anactuator forrapidmovementof theactuator.

Pressure Control Valves

Pressure Relief Valve(safety valve)

normally closed

- linepressure islimited tothe settingof thevalve,secondary

part isdirected totank.

Proportional Pressure Relief



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- linepressure islimited toandproportionalto anelectronicsignal

Sequence Valve

- when thelinepressurereaches thesetting ofthe valve,valveopenspermittingflow to thesecondaryport. Thepilot mustbeexternallydrained totank.

Pressure Reducing valve

- pressuredownstreamof valve islimited to

the settingof the valve

Flow Control Valves

Throttle valve

-adjustableoutput flow

Flow Control valve



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-with fixedoutput(variations ininletpressure donot affectrate of flow)

-with fixedoutput and

relief port toreservoirwith relief forexcess flow(variations ininletpressure donot affectrate of flow)

-withvariable

output

-fixed orifice

-meteredflow towardright freeflow to left

-pressurecompensatedflow controlfixed output

flowregardlessof load

-pressureandtemperaturecompensated

-withvariableoutput andrelief port to

reservoirFlow dividing valve

-flow isdividedequally totwo outputs.



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Shut-Off Valve

-Simplifiedsymbol

Accumulators

Filters, Water Traps,

Lubricators and

Miscellaneous Apparatus

Filter or Strainer

Water Trap

-with manualdrain

-withautomaticdrained

Filter with water trap

-with manualdrain

-automaticdrain

Air Dryer

refrigerant,or chemicalremoval ofwater fromcompressedair line

Lubricator



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-oil vapor isindected intoair line

Conditioning unit

-compoundsymbol offilter,

regulator,lubricatorunit

-SimplifiedSymbol

Heat Exchangers

-air or water

cooled unitdesigned toremove heatfrom oilreturning toreservoir

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