Specifies a range of symbols for use in diagrams prepared for design, circuit analysis and maintenance applications of hydraulic and pneumatic systems. It is in sections covering general rules and basic symbols, flowlines and connections, control mechanisms, energy conversion and storage, energy control and regulation, fluid storage and conditioning and supplementary equipment. A number of complete functional symbols of common components are given as examples. This Standard is identical with and has been reproduced from ISO 1219-1:1991.