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Graphical Symbols For Pneumatic Systems and Components

The following symbols are specified in ISO 1219-1 (E/F). They are virtually identical to those specified in BS 2917. The other standard source of reference for Europe, CETOP RP3, is superceded by ISO 1219.

General (Basic and Functional Symbols)

The symbols for hydraulic and pneumatic equipment and accessories are functional and consist of one or more basic symbols and in general of one or more functional symbols. The symbols are neither to scale nor in general orientated in any particular direction.

Aftercooler	Air dryer	Air inlet filter	Air receiver
Automatic drain valve	Cooler	Conditioning unit
Compressor
Filter or strainer	Filter with Trap		Pressure Gauge
	with manual control	automatically drained
Pressure regulator valve	Non-return valve		Silencer
	with manual control	spring loaded
Flow indicator device	Pressure relief valve (safety valve)		Temperature sensing
Quick release self sealing coupling	Stop valve (any type)		Direction of flow
	open	closed
Water trap		Flow Restrictor
with manual control	automatically drained	fixed	variable
Flexible line