simbolos hidraulicos.pdf
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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
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ydraulic Schematic Symbols
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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ydraulic Schematic Symbols
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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ydraulic Schematic Symbols
- 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.
Directional control valve (3 ports /
2 positions)
-Normallycloseddirectionalcontrol valvewith 3 portsand 2 finite
positions.-Normallyopendirectionalcontrol valvewith 3 portsand 2 finitepositions.
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ydraulic Schematic Symbols
Directional control valve (4 ports /
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)
Directional control valve (5 ports /
2 positions) Normally a pneumatic
valve
-directionalcontrol valvewith 5 portsand 2 finitepostions
Directional control valve (5 ports /3 positions) Normally a pneumatic
valve
-directionalcontrol valvewith 5 portsand 3 finitepostions
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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ydraulic Schematic Symbols
-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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ydraulic Schematic Symbols
-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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ydraulic Schematic Symbols
-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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ydraulic Schematic Symbols
- 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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ydraulic Schematic Symbols
-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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ydraulic Schematic Symbols
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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ydraulic Schematic Symbols
-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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