DIN ISO 1219-1:2019-01

Using graphical symbols for hydraulic and pneumatic systems in compliance with standards

DIN ISO 1219-1 specifies graphical symbols for fluid power components and their functions. It describes standardized symbols for hydraulic and pneumatic systems and assists designers, technical drafters, CAD users, and maintenance specialists in presenting fluid power circuits clearly. The standard provides the basis for creating and interpreting circuit diagrams, product documentation, and technical documents.

What is DIN ISO 1219-1 about?

The standard defines the basic elements and construction rules for graphical symbols used in fluid power applications. It focuses on symbols for valves, pumps, motors, cylinders, filters, accumulators, measuring instruments, connections, and control elements, as well as their use in hydraulic and pneumatic circuits. In addition, the standard describes rules for constructing, identifying, and using symbols in both conventional and data-processing applications.

The symbols are not intended to depict design details, but rather to provide an unambiguous description of the function and operating principle of fluid power components.

Topics covered

• Graphical symbols for hydraulics and pneumatics
• Directional, pressure, flow-control, and non-return valves
• Pumps, motors, and energy converters
• Cylinders and linear actuators
• Filters, accumulators, heat exchangers, and accessories
• Ports, lines, and connecting elements
• Measuring and indicating instruments
• Proportional and servo valves
• Rules for constructing symbols and applying them in circuit diagrams

Practical relevance

Graphical symbols are the common language of fluid power technology. DIN ISO 1219-1 helps companies to represent and document hydraulic and pneumatic systems unambiguously. This reduces misunderstandings between design, manufacturing, commissioning, and maintenance.

The standard is particularly relevant to the preparation of circuit diagrams and technical documentation, as it enables internationally consistent representation of fluid power components and facilitates cooperation between manufacturers, operators, and service providers.

Changes compared with DIN ISO 1219-1:2007-12

The 2019 edition replaces the previous 2007 edition and is based on ISO 1219-1:2012, including Amendment 1:2016. The most important changes include:

• fundamental technical revision of the standard
• addition of new examples for pneumatic applications in Clause 7
• addition of new symbols for basic mechanical elements in Clause 8
• expansion and updating of numerous symbol representations for hydraulic and pneumatic components
• adaptation to current requirements for CAD-assisted technical documentation

Target audience

• Designers and development engineers
• CAD users
• Hydraulics and pneumatics specialists
• Technical drafters
• Maintenance and service personnel
• Mechanical engineering and plant engineering companies
• Education and training institutions
• Technical documentation specialists

Conclusion

DIN ISO 1219-1 provides the fundamental basis for the representation of fluid power systems using graphical symbols. With its standardized symbols and rules for application, it supports the preparation of technical documentation in compliance with standards and ensures unambiguous communication in hydraulics and pneumatics.

This document replaces DIN ISO 1219-1:2007-12 .