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Introduction to Hydraulic Schematic
Symbols (cont'd)
Control Mechanisms
Section E
9803/3280
Section E
3 - 13
Issue 1
Basic System Operation
S189740
S189730
Rotating shaft-one direction
Rotating shaft-two directions
Detent
Locking device
Over centre device
Simple linkage
General control
Push button operated
Lever operated
Pedal operated
Stem operated
Spring operated
Roller operated
Roller trip operated
(one directional)
M
Solenoid one winding
Solenoid two winding
Electric motor operated
Internal pressure
pilot operated
External pressure
pilot operated
Pressure operated
spring release
Pilot operated by solenoid
pilot valve
Pilot operated by a solenoid
or separate pilot valve
Pressure gauge
Pressure switch