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List of graphical symbols commonly used in circuit diagrams for hydraulic machinery

Graphical symbols in circuit diagrams for hydraulic machinery
The graphical symbols for circuit diagrams of hydraulic machinery are a subset of symbols used in fluid power systems. All symbols for fluid power systems using hydraulics, pneumatics and the like are standardized in ISO 1219:2012.

Direction of fluid flows
The direction of fluid flows in hydraulics is generally indicated by arrows in the corresponding fluid elements, pipes, and valves, respectively.

Hydraulic accumulators and reservoirs
Hydraulic accumulators and reservoirs are fluid containers that may have the following purpose:
 * collecting excess fluid escaping from the circuit in a predefined manner, e.g. by means of a pressure relief valve
 * adding fluid from the accumulator to the circuit in a predefined manner, e.g. by means of a hydraulic pump
 * removing dirt from the hydraulic fluid as dirt particals will eventually sink to the bottom of the reservoir

Valves
Valves regulate the flow of a hydraulic fluid between at least two ports in the valve body. Different types have different tasks in a hydraulic circuit.

Directional control valves
A directional control valves (DCV) can redirect the flow paths between its ports or simply block one or more ports. Also called a selector valve.

Check valves
A check valve lets the fluid pass only in one direction between its two ports. The opposite flow direction is blocked by the valve. Thus it is the mechanical analogue of an electronic diode.

Pressure control valves
A pressure control valve (PCV) allows to limit or reduce the pressure inside a hydraulic circuit to certain value behind the valve. The pressure limit can be fixed or adjustable.

Siehe auch

 * Liste der Schaltzeichen
 * Liste der Schaltzeichen (Elektrik/Elektronik)
 * Liste der Schaltzeichen (Mess-, Steuer- und Regelungstechnik)
 * R&I-Fließschema

Weblinks

 * D&C Scheme Editor – kostenloses Programm zur Schaltplanerstellung und Wartung der Bauelemente