Vogele Basic Training Hydraulics & Electrics

H.5.0 Circuit symbols and circuits
H.5.1 Explanation
A circuit diagram is the plan of a hydraulic system. The components are presented by means of
standardized symbols.
These diagrams are part of the requisite documentation of every system and are particularly
important for the creation and maintenance of a system.
The list of circuit symbols contains a comprehensive array of symbols used in hydraulics.
Circuit diagrams may be drawn up individually, in line with company specifications or in accordance
with standards (DIN ISO 1219).
They can represent components, such as operating and control circuits, the steps of the operating
sequence, the circuit components with their designations and the associated lines and connections.
The spatial arrangement of the components is not usually taken into consideration, or it is presented
in a separate overview plan.
A symbol exclusively depicts the function of a component / device. It says nothing about the
construction or point of installation of the hydraulic components.
Symbols are presented in one colour, normally idle, without current and in their initial position.