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Hydraulic symbols

Fluid circuit diagrams are made by hydraulic symbols of components like cylinders, motors, pumps, valves, heat exchangers, filters, etc. connecting each other by means of pipelines, hydraulic manifolds or rigid tubes.

The organization ISO (International Standards Organization) by means of standard ISO 1219-1:2012 has defined the hydraulic symbols with the aim of a hydraulic circuit diagram can be understood by any technician with knowledge about hydraulics.

hydraulic symbols

Below you will see some of the most common hydraulic schematic symbols used in a hydraulic circuit. Here you can also download hydraulic symbols in pdf or image that you may need:


Hydraulic pump symbols

Unidirectional fixed displacement hydraulic pump symbol.

Unidirectional fixed displacement hydraulic pump symbol

Bidirectional fixed displacement hydraulic pump symbol.

Bidirectional fixed displacement hydraulic pump symbol

Unidirectional variable displacement hydraulic pump symbol.

Unidirectional variable displacement hydraulic pump symbol

Bidirectional variable displacement hydraulic pump symbol.

Bidirectional variable displacement hydraulic pump symbol

Hydraulic hand pump symbol.

Hydraulic hand pump symbol

CLICK HERE for more technical information about hydraulic pumps


Pumps for hydraulic circuits


Hydraulic motor symbols

Unidirectional fixed displacement hydraulic motor symbol.

Unidirectional fixed displacement hydraulic motor symbol

Bidirectional fixed displacement hydraulic motor symbol.

Bidirectional fixed displacement hydraulic motor symbol

Unidirectional variable displacement hydraulic motor symbol.

Unidirectional variable displacement hydraulic motor symbol

Bidirectional variable displacement hydraulic motor symbol.

Bidirectional variable displacement hydraulic motor symbol

Hydraulic rotary actuator symbol.

Hydraulic rotary actuator symbol

CLICK HERE for more technical information about hydraulic motors


hydraulic motors for systems


Hydraulic cylinder symbols

Single-acting cylinder return stroke by external force symbol.

Single-acting cylinder return stroke by external force symbol

Single-acting cylinder return stroke through a spring symbol.

Single-acting cylinder return stroke through a spring symbol

Double-acting cylinder symbol.

Double-acting cylinder symbol

Double-acting cylinder with double rod symbol.

Double-acting cylinder with double rod symbol

Double-acting cylinder with cushioning on one side symbol.

Double-acting cylinder with cushioning on one side symbol

Double-acting cylinder with cushioning on both sides symbol.

Double-acting cylinder with cushioning on both sides symbol

Double-acting cylinder with adjustable stroke and cushioning on one side symbol.

Double-acting cylinder with adjustable stroke and cushioning on one side symbol

Double-acting cylinder with adjustable stroke and cushioning on both sides symbol.

Double-acting cylinder with adjustable stroke and cushioning on both sides symbol

Telescopic cylinder single-acting symbol.

Telescopic cylinder single-acting symbol

Telescopic cylinder double-acting symbol.

Telescopic cylinder double-acting symbol

Check in Amazon some of the reference books we use everyday.






Hydraulic valve symbols

Hydraulic pressure control valve symbols

Hydraulic pressure relief valve direct operated symbol.

Hydraulic pressure relief valve direct operated symbol

Hydraulic pressure relief valve pilot operated symbol.

Hydraulic pressure relief valve pilot operated symbol

Hydraulic pressure reducing valve direct operated symbol.

Hydraulic pressure reducing valve direct operated symbol

Hydraulic pressure reducing valve pilot operated symbol.

Hydraulic pressure reducing valve pilot operated symbol

Hydraulic pressure sequence valve direct operated symbol.

Hydraulic pressure sequence valve direct operated symbol

Hydraulic pressure sequence valve pilot operated symbol.

Hydraulic pressure sequence valve pilot operated symbol

Hydraulic counterpressure overcenter valve symbol.

Hydraulic counterpressure overcenter valve symbol

Hydraulic flow control valve symbols

Hydraulic flow control variable throttling two way valve symbol.

 Hydraulic flow control variable throttling two way valve symbol

Hydraulic flow control variable throttling with check valve symbol.

Hydraulic flow control variable throttling with check valve symbol

Hydraulic compensated flow regulator two-way valve symbol.

Hydraulic compensated flow regulator two-way valve symbol

Hydraulic compensated flow regulator three-way valve symbol.

Hydraulic compensated flow regulator three-way valve symbol

Hydraulic check valve symbols

Hydraulic check valve without spring symbol.

Hydraulic check valve without spring symbol

Hydraulic calibrated check valve symbol.

Hydraulic calibrated check valve symbol

Hydraulic pilot operated check valve symbol.

Hydraulic pilot operated check valve symbol

Hydraulic pilot operated check valve with drainage symbol.

Hydraulic pilot operated check valve with drainage symbol

Hydraulic directional control valve symbols

Hydraulic directional control valve 2 ways - 2 positions symbol.

Hydraulic directional control valve 2 ways - 2 positions symbol

Hydraulic directional control valve 3 ways - 2 positions symbol.

Hydraulic directional control valve 3 ways - 2 positions symbol

Hydraulic directional control valve 4 ways - 2 positions symbol.

Hydraulic directional control valve 4 ways - 2 positions symbol

Hydraulic directional control valve 4 ways - 3 positions symbol.

Hydraulic directional control valve 4 ways - 2 positions symbol

Actuators for directional control valve symbols

Detent actuator for directional control valve symbol.

Detent actuator for directional control valve symbol

Pushbutton actuator for directional control valve symbol.

Pushbutton actuator for directional control valve symbol

Lever actuator for directional control valve symbol.

Lever actuator for directional control valve symbol

Adjustable stroke actuator for directional control valve symbol.

Adjustable stroke actuator for directional control valve symbol

Spring actuator for directional control valve symbol.

Spring actuator for directional control valve symbol

Cam actuator for directional control valve symbol.

Cam actuator for directional control valve symbol

Pneumatic actuator for directional control valve symbol.

Pneumatic actuator for directional control valve symbol

Electric actuator for directional control valve symbol.

Electric actuator for directional control valve symbol

Proportional electric actuator for directional control valve symbol.

Proportional electric actuator for directional control valve symbol

Hydraulic actuator for directional control valve symbol.

Hydraulic actuator for directional control valve symbol

Electro-hydraulic actuator for directional control valve symbol.

Electro-hydraulic actuator for directional control valve symbol

Proportional electro-hydraulic actuator for directional control valve symbol.

Proportional electro-hydraulic actuator for directional control valve symbol

Energy transmission elements symbols.

Electric motor symbol.

Electric motor symbol

Engine motor symbol.

Engine motor symbol

Rotary shaft in one direction symbol.

Rotary shaft in one direction symbol

Rotary shaft in both directions symbol.

Rotary shaft in both directions symbol

Hydraulic connections and lines symbols.

Main line symbol.

Main line symbol

Pilot line symbol.

Pilot line symbol

Drain line symbol.

Símbolo hidráulico de la línea de drenaje

Line pipe with flexible hose symbol.

Line pipe with flexible hose symbol

Crossing lines symbol.

Crossing lines symbol

Connection point symbol.

Connection point symbol

Branching closed symbol.

Branching closed symbol

Branching with connected piping symbol.

Branching with connected piping symbol

Fast coupling symbol.

Fast coupling union

Fast coupling with check valves symbol.

Fast coupling with check valves symbol

Hydraulic accessories symbols

Hydraulic accumulator symbol.

Hydraulic accumulator symbol

Filter symbol.

Filter symbol

Heat exchanger (heater) symbol.

Heat exchanger (heater) symbol

Heat exchanger (cooler) symbol.

Heat exchanger (cooler) symbol

Heat exchanger (liquid operated cooler) symbol.

Heat exchanger (liquid operated cooler) symbol

Reservoir (pipings above level) symbol.

Reservoir (pipings above level) symbol

Reservoir (pipings under level) symbol.

Reservoir (pipings under level) symbol

Pressurized reservoir symbol.

Símbolo hidráulico de tanque presurizado

Pressure gauge symbol.

Pressure gauge symbol

Differential pressure gauge symbol.

Differential pressure gauge symbol

Pressure switch symbol.

Pressure switch symbol

Maintenance, implementation or design hydraulic circuits require to understand schematics. In this blog you will find the basic vocabulary that you will need to work on a daily basis.

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