Often single components can utilise more than one operator, for example a solenoid valve with spring return but, because of the standardisation, it is always clear which operator is fulfilling which function. Manual and mechanical valves have a variety of operators and some are shown in the chart above for example, toggle lever and push button. A common mechanism is the spring, but others are solenoid, (air) pilot, pilot assisted solenoid and air spring.

general actuation and return symbols - there are common actuation and return mechanisms between components and these have standardised symbols.

The chart above shows a good representation of common symbols and more is outlined below. The Standard lays out several elements that must be represented by each symbol, where applicable: The function of the component actuation and return mechanisms the number of switching positions the number of connections an indication of the flow path and the operating principle. Symbols provide an effective way of describing the functionality and operation of often complex systems, providing they are consistent across all providers of the systems.įor pneumatic components, ISO 1219-1 is a recognised standard ensuring this consistency there is also the Japanese Industrial Standard (JIS) but, fortunately, in most cases the symbols are identical between the two standards.

Iso pneumatic symbols