Overview
ISO 9222-2:1989 - Technical drawings - Seals for dynamic application - Part 2: Detailed simplified representation specifies a convention for depicting seals in technical drawings when more than the very basic outline is needed but showing the full, exact geometry is unnecessary. Compared with Part 1 (general simplified representation), this part provides a more detailed, standardized way to indicate functional features such as lip configuration, dust lips, labyrinths and packing elements. The standard collects symbol elements, tabulated representations and example figures intended for assembly drawings, catalogs and other engineering documentation.
Key topics and requirements
- Purpose and scope
- Use where the exact shape of a seal need not be shown (e.g., assembly drawings) but functional details must be clear.
- Only one simplification style (general or detailed) should be used on a given drawing to avoid misunderstandings.
- Method of representation
- Defines a set of graphic elements (given in tabular form) such as long and short continuous lines, angular lines, and arrowheads to indicate sealing direction and side.
- Specifies that simplified seal depictions are placed above the axis in sectional views.
- Elements covered
- Symbols to represent static (pressed/fixed) elements and dynamic sealing lips.
- Conventions for indicating dust lips, wipers, contactless seals (e.g., labyrinths), and male/female elements.
- Detailed simplified depictions for common seal types: rotary shaft lip seals (with/without dust lip), mechanical seals, piston rod seals (with/without wipers), U-cups, V‑rings, packing sets and labyrinth seals.
- Illustrative guidance
- Tables and figures (examples) illustrate standard simplified depictions and common arrangements to ensure consistent interpretation.
Applications and users
- Who uses it
- Mechanical designers and draughtsmen preparing assembly and subsystem drawings
- CAD engineers standardizing seal symbols in parts libraries
- Seal manufacturers and suppliers preparing catalog illustrations and datasheets
- Maintenance, installation and service engineers who need clear, concise sealing details
- Technical authors and standards coordinators producing consistent documentation
- Practical benefits
- Speeds drawing production by avoiding full 3D detail while preserving functional clarity
- Ensures uniform interpretation across engineering teams and suppliers
- Facilitates communication between design, procurement and maintenance
Related standards
Keywords: ISO 9222-2, seals for dynamic application, technical drawings, detailed simplified representation, rotary shaft lip seals, piston rod seals, labyrinth seals, U-cups, V-rings, assembly drawings, CAD symbols.