Hydraulics & Pneumatics CHAPTER 4_ ISO Symbols and Glossary, Part 1

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September 29, 2006

CHAPTER 4: ISO Symbols and Glossary, part 1By Bud Trinkel

A family of graphic symbols has been developed to represent fluid power components andsystems on schematic drawings. In the United States, the American National Standards

Institute (ANSI) is responsible for symbol information. The Institute controls the make-up of

symbols and makes changes or additions as required. The International Standards

Organization (ISO) has the same control over symbols used internationally. Both systems

have almost the same format (especially since ANSI changed its symbols in 1966 to eliminate

all written information).

Standard symbols allow fluid power schematic diagrams to be read and understood by

persons in many different countries, even when they don't speak the same language. Either

symbol set (ANSI or ISO) may be - and is - used in the United States. However, manycompanies today use the ISO symbols as their standard for work with foreign suppliers and

customers.

The following pages go through all standard ISO symbol information as it applies to hydraulic

and pneumatic schematics. There are still many plants that modify the standards to suit some

individual's taste. This widespread practice may be confusing to novices. Symbols have been

developed to represent most of the available fluid power components. However, some parts

must be made up of combinations of different symbols to show how they function. Other times

there is no standard symbol and one must be made up. In such cases, look first in thesupplier's catalog for the symbol they show. If the supplier did not make a symbol, the only

other option is design one for the new part. Try to design the new symbol using standard

practices shown here.

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As the phrase fluid power implies, these symbols cover both hydraulic and pneumatic

components. Any exceptions are noted.


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Hydraulics & Pneumatics CHAPTER 4_ ISO Symbols and Glossary, Part 1