Valve material selection should not be based only on nominal pressure or valve size. Operating pressure, temperature,...
What is ISO 5211?
ISO 5211 specifies the dimensions of actuator mounting flanges and drive interfaces used between quarter-turn valves and actuators. The objective is to ensure interchangeability and compatibility across automation systems.
Applications of ISO 5211
- Ball Valves
- Butterfly Valves
- Plug Valves
- Quarter-Turn Dampers
- Pneumatic Actuators
- Electric Actuators
- Hydraulic Actuators
- Valve Automation Systems
Purpose of the Standard
By defining standardized mounting interfaces, ISO 5211 allows actuators and valves from different manufacturers to be combined while maintaining dimensional compatibility.
Main Interface Components
Mounting Flange
The mounting flange defines the bolt pattern and mounting dimensions between the actuator and the valve.
Drive Interface
The standard also specifies drive dimensions for torque transmission between actuator and valve stem.
ISO 5211 Flange Sizes
| Size | Typical Application |
|---|---|
| F03 | Small valves DN10-DN20 |
| F04 | Small valves DN15-DN25 |
| F05 | Ball and Butterfly Valves DN20-DN50 |
| F07 | Valves DN40-DN100 |
| F10 | Valves DN80-DN150 |
| F12 | Valves DN150-DN250 |
| F14 | Large-size valves |
| F16 | High torque applications |
| F25 | Heavy-duty industrial service |
Benefits of ISO 5211
- Interchangeability between manufacturers
- Simplified actuator selection
- Reduced installation costs
- Easier maintenance
- Faster equipment replacement
- Standardized torque transmission
Typical Industrial Applications
Process Industry
Automated ball valves and butterfly valves used for flow control applications.
Water Systems
Electric and pneumatic isolation valves.
Marine Applications
Fuel, cooling water and seawater automation systems.
Power Generation Facilities
Automated valves installed in utility and process systems.
Relationship with Other Standards
| Standard | Scope |
|---|---|
| ISO 5211 | Valve Actuator Interface |
| ISO 5210 | Multi-Turn Actuators |
| VDI/VDE 3845 | NAMUR Mounting |
| IEC 60529 | IP Protection Ratings |
Frequently Asked Questions
Which valves use ISO 5211?
Most quarter-turn ball valves, butterfly valves and plug valves designed for automation.
Can an ISO 5211 actuator be installed on a valve from a different manufacturer?
Yes, provided both the valve and actuator comply with the same ISO 5211 flange size.
What do F05, F07 and F10 mean?
They represent standardized actuator mounting flange sizes defined by ISO 5211.
Conclusion
ISO 5211 is the primary international standard for quarter-turn valve actuator mounting interfaces. By standardizing flange dimensions and drive connections, it simplifies the design, installation and maintenance of industrial valve automation systems.