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Hydraulic Symbols – Actuation Types

Mechanical component rod (linear movement in two directions)

Mechanical component shaft (rotary movement in two directions)

Detent

Locking device, 1 actuation direction (a device for blocking a mechanism, for release, a separate actuation element is required (to be applied in square))

Manual override

Pushbutton (1 direction of actuation)

Pushbutton / pull-out knob (2 directions of actuation)

Lever

Pedal (1 direction of actuation)

Pedal (2 directions of actuation)

Plunger (1 direction of actuation)

Plunger with adjustable stroke limitation

Spring-return (2 directions of actuation)

Spring centering

Electromagnetic actuation, two-sided, with a spring centering

Roller tappet (2 directions of travel)

Roller lever (1 direction of travel)

Electrical element with linear direction of actuation (1 solenoid or coil, 1 direction)

Electrical element with linear direction of actuation (2 solenoids or coils, 2 directions)

Electrical element with linear direction of actuation (2 solenoids or coils, 2 directions, continuously adjustable)

Operation by means of pressurization or depressurization (pilot)

Control surface actuation (different sizes, lying opposite of each other)

Direct actuation through internal control line

Direct actuation through external control line

Hydraulic actuation (1-stage, 2-stage)

2-stage electro-hydraulic operation with external pilot oil supply

1-stage pneumatic actuation

2-stage electro-hydraulic operation, spring centering of the middle position, external steering oil feed and return

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