描述Pfd-symbols.png	Screenshot from the free open source program, Dia, showing available chemical engineering symbols for use in process flow diagrams.
来源	http://en.wikipedia.org/wiki/File:Pfd-symbols.png
作者	en:User:Jdpipe
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Screenshot from the free open source program, Dia, showing available chemical engineering symbols for use in process flow diagrams.

Row-by-row, they are:

• fan/stirrer, spray ball, pneumatic line, pneumatic line vertical, measurement, simple heat exchanger
• simple heat exchanger vertical, alternative heat exchanger, alternative heat exchanger, fixed-sheet heat exchanger, floating-head or u-tube heat exchanger.
• kettle reboiler, air cooler, forced-flow air cooler, induced-flow air cooler, plate exchanger.
• double-pipe exchanger, heating/cooling coil, heating/cooling coil, simple furnace, simple vessel, knockout drum, tray column, tray column detailed
• fluid contacting vessel, reaction/absorption vessel, autoclave, open tank, clarifier/settling tank, sealed tank, covered tank, fixed roof tank
• tank with floating roof, storage sphere, gas holder basic, centrifugal pump or fan, positive displacement rotary pump or compressor, reciprocating pump or compressor, axial flow fan
• compressor or turbine, ejector or injector, AC generator, valve, valve, control valve, control valve
• basic filter, mixer, cyclonic separation or hydrocyclone, spray dryer, centrifuge