ISO was prepared by Technical Committee ISO/TC , Fluid power ISO , Fluid power systems and components — Graphical symbols and. List of globally recognized pneumatic symbols. All the symbols you need to design your pneumatic circuit format. Scan through and easily download the. A family of graphic symbols has been developed to represent fluid power components and systems on schematic drawings. In the United States.

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Symbols based on ISO and kso. Part of our FREE hydraulic training resource. Hydraulic symbols provide a clear representation of the function of each hydraulic component.

Pneumatic Symbols

Laying each symbol out on the page in the same sequence the components are used in the circuit allows people to understand the complete function of the hydraulic equipment. It would be nice to think that each type of valve had its own symbol and that all valves can be clearly defined, however, the international standard has been the focus of much discussion for many years and is something of a compromise.


The problem is that in the past manufacturers have often had subtle differences in the detail of their valve design, which, they’d all like to form part of the standard symbol. A relief valve, for example, may always have the same basic function but can be constructed in significantly different ways. As a hydraulics engineer, it’s important to understand the difference between valves, even though this may not always be possible from the symbol.

For example knowing whether iao valve uses a sealed poppet, spool element or both can make a big iiso to the circuit operation; as can pilot feed or orifice positions etc. Find more free hydraulic training videos here.

The approach we recommend is generally to build your own larger symbols from the same basic elements whenever more detail is required. If you learn the basics you should be able to interpret all circuits provided you pay particular attention whenever the fine detail changes.

Sometimes putting jso much detail will confuse things so designers might leave it out. Often the manufacturers are not keen to disclose too much information on what is essentially their own unique IP that has probably taken them many years to develop.


Always be careful not to assume circuit drawings are correct. Circuits may be changed without the drawings being updated and some are just plain wrong.

Use them as a master to work through the components in the actual circuit you are working on; checking the valves to the symbols as you go. Hydraulic Circuits Design Symbols. Learn about hydraulic symbols with this training video.

Iso symbols free download – Google Docs

Full Symbol Training Links. Ancillary hydraulic equipment symbols Check or shut off valves Directional Valve Symbols Pressure control valve symbols Hydraulic flow control valve symbols Hydraulic logic valve symbols Hydraulic pump symbols Hydraulic measuring equipment symbols Hydraulic actuator symbols.

Free Hydraulic Training Links.

Advanced circuit design techniques. Caution when analysing a circuit.