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CHAPTER 4: ISO Symbols andGlossary, part 1

Sep. 28, 2006 Bud Trinkel | Hydraulics & Pneumatics

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 thesame 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, many companies todayuse 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 andpneumatic 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 beendeveloped to represent most of the available fluid power components. However, some parts mustbe made up of combinations of different symbols to show how they function. Other times there isno standard symbol and one must be made up. In such cases, look first in the supplier's catalogfor 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.

As the phrase fluid power implies, these symbols cover both hydraulic and pneumaticcomponents. Any exceptions are noted.

Read more about hydraulic symbology in a series from author Josh Cosford .


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CHAPTER 4: ISO Symbols andGlossary, part 2


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