ISO 15407-2:2003

Overview

ISO 15407-2:2003 - Pneumatic fluid power - Five-port directional control valves, sizes 18 mm and 26 mm - Part 2: Mounting interface surfaces with optional electrical connector - specifies the mechanical and electrical interface requirements that enable interchangeability of five-port pneumatic directional control valves. The standard covers dimensions, tolerances, port identification and an optional electrical connector for valves used up to a maximum rated pressure of 1,6 MPa (16 bar). It does not prescribe functional performance of the valves.

Key topics and technical requirements

• Mounting interface dimensions and tolerances: Detailed dimensions and form/location tolerances are provided for sizes 18 mm and 26 mm (see figures and table in the standard). Surface finish inside the continuous boundary: Ra = 1,6 µm and flatness 0,1 mm over 100 mm.
• Port and orifice identification: Principal flow ports are designated 1, 2, 3, 4, 5; pilot/actuation orifices are 12 and 14 (port 14 preferred for single-source external solenoid pilot supply). For monostable valves the mandatory stable position is defined relative to control mechanism 12.
• Optional electrical connector: Specifies mateability, pin layout and electrical ratings:
  • Connector rated at 125 V maximum (DC or AC) and ≥ 1 A current.
  • Dielectric withstanding voltage 1 500 V AC (minimum, sea level).
  • Three live contacts + one earth; square pins 0,64 mm × 0,64 mm located on 2,54 mm centres; contacts arranged at the corners of a square.
  • Contact assignments: Contact 4 = common return; Contact 3 = earth; Contacts 1/4 for single-solenoid, Contacts 2/4 for second solenoid on double-solenoid valves. Indicator lamps / surge suppression optional and must be polarity-insensitive.

Applications and who uses it

ISO 15407-2 is intended for:

• Valve manufacturers and component designers standardizing mounting patterns and optional electrical interfaces.
• OEMs and system integrators specifying interchangeable five-port directional control valves in pneumatic systems.
• Pneumatic equipment suppliers, maintenance and commissioning engineers ensuring compatibility of replacement valves and modular blocks.
• CAD and product documentation teams producing drawings that must conform to international tolerances.

Practical benefits: simplifies valve interchangeability, reduces custom baseplate designs, and standardizes electrical mateability for solenoid-actuated valves in automation and industrial pneumatic systems.

Related standards

• ISO 15407-1 - mounting interfaces without electrical connector
• ISO 11727 - identification of ports and control mechanisms
• ISO 5599 series / ISO 5599-1 and -2 - related five-port valve standards
• ISO 4400 / ISO 5598 - related electrical connector and vocabulary references

Using ISO 15407-2 helps ensure mechanical and electrical compatibility across suppliers for five-port directional control valves (sizes 18 mm and 26 mm), improving modularity and reducing integration risk.