Overview
ISO 15218:2003 (Pneumatic fluid power - 3/2 solenoid valves - Mounting interface surfaces) specifies the geometric and surface requirements for mounting interfaces of 3/2 pneumatic solenoid valves. The standard covers four mounting sizes and defines the arrangement of flow passage holes, fixing holes and the sealing surface for valves intended for operation up to a maximum rated pressure of 1.6 MPa (16 bar). Its objective is to ensure mechanical interchangeability and reliable sealing across compliant valve designs.
Key Topics
- Mounting sizes: Interfaces are defined for widths of 10 mm, 15 mm, 22 mm and 30 mm. Sizes 10/15/22 share a common interface presentation; the 30 mm width has dedicated figures for two exhaust variants.
- Hole arrangement: Each interface includes three holes for flow passages and two holes for fixing screws, plus provisions for a sealing surface. The layout details are provided by the figures and table in the standard.
- Surface condition requirements:
- Roughness: Ra = 1.6 µm (see ISO 4287 and ISO 1302 for surface-profile specifications).
- Flatness: 0.05 mm maximum for sizes 10, 15 and 22; 0.1 mm maximum for size 30.
- Dimensional tolerances: General unspecified tolerances are to comply with ISO 2768-1. Specific dimensional values and tolerances for each size are given in the standard's figures and table.
- Variants for size 30: The 30 mm interface includes two variants shown in separate figures - one with a collectable exhaust or with a non-collectable exhaust - each with defined mounting and sealing provisions.
- Identification guidance: Manufacturers conforming to the standard are recommended to reference ISO 15218:2003 in documentation, test reports and catalogs to indicate compliance.
Applications
ISO 15218:2003 is aimed at designers, manufacturers and system integrators working with pneumatic control systems who require:
- Interchangeability of 3/2 solenoid valves across suppliers and products.
- Reliable sealing and mounting under pressures up to 1.6 MPa.
- Standardized interfaces for valve manifold blocks, actuator control manifolds and pneumatic control panels.
Adoption reduces design variations, simplifies inventory and supports modular system design in factory automation, process equipment and fluid power control systems.
Related Standards
The standard references and aligns with these ISO documents:
- ISO 1302 - surface texture indication in technical product documentation
- ISO 2768-1 - general tolerances for linear and angular dimensions
- ISO 4287 - surface texture: profile method and parameters
- ISO 5598 - vocabulary for hydraulic and pneumatic systems
- ISO 11727 - identification of ports and control mechanisms on valves
Keywords: ISO 15218, 3/2 solenoid valves, mounting interface surfaces, pneumatic, dimensions, tolerances, Ra 1.6 µm, 1.6 MPa, valve interchangeability.