NAMUR Mounted Solenoid Valves to VDI/VDE 3845
NAMUR Valves – Solenoid Valves for Pneumatic Actuators (VDI/VDE 3845)
NAMUR valves control pneumatic actuators directly – without complex piping. Thanks to the standardized NAMUR mounting pattern to VDI/VDE 3845, the solenoid valve is mounted directly onto the actuator interface, with air routed through internal channels. At STASTO you'll find NAMUR solenoid valves in 3/2-way and 5/2-way versions for single-acting and double-acting actuators.
3/2 & 5/2 NAMUR Valves for Pneumatic Actuators
Your Advantages
Why choose NAMUR solenoid valves from STASTO
From the solenoid valve to the connecting kit to the butterfly valve – components that fit together, from a single source.
Direct mounting to VDI/VDE 3845
Standardized NAMUR interface for tool-free mounting on pneumatic actuators – no separate piping, with fewer potential leak points.
3/2 and 5/2 from a single source
3/2-way for single-acting, spring-return actuators and 5/2-way for double-acting actuators – matched to the respective actuator type.
Complete control chain
From the NAMUR solenoid valve to system accessories such as valve blocks and connecting kits to the automated butterfly valve.
B2B Consulting
Selection support for maintenance, procurement, engineering and plant construction from the STASTO team.
Guide
Understanding and Selecting the Right NAMUR Valve
Design, function and selection criteria of NAMUR solenoid valves at a glance.
What is a NAMUR valve?
- Design
- Solenoid valve for direct mounting with a standardized connection pattern per VDI/VDE 3845, which is bolted directly onto the NAMUR interface of the pneumatic actuator.
- Air routing
- Compressed air is routed through internal channels – without the need for individual hoses.
- Benefit
- Reduces piping, installation time, and potential leak points.
3/2 way or 5/2 way – which version is right?
- 3/2 way
- For single-acting actuators with spring return: the valve pressurizes one chamber, while the springs move the actuator to its fail-safe position on loss of power or air.
- 5/2 way
- For double-acting actuators: both actuator chambers are alternately pressurized and vented.
- Selection
- The right choice depends on the actuator type and the required fail-safe function.
What should you consider when selecting a valve?
- Interface & size
- Check the NAMUR hole pattern and the actuator size.
- Coil voltage
- Choose a coil to match your control system – our range includes, for example, a standard coil with 24 VDC.
- Connection & Accessories
- Consider connector width and included accessories such as mating connector or silencer.
- Ambient Conditions
- Protection rating, temperature, and any Ex requirements vary by variant – please check the specific datasheet or contact us.
Comparison
3/2-Way vs. 5/2-Way NAMUR
The right NAMUR version depends on the actuator type and the desired fail-safe position.
| 3/2 | 5/2 | |
|---|---|---|
| Actuator Type | single-acting (spring-return) | double-acting |
| Operating Principle | pressurizes one actuator chamber | alternately controls both chambers |
| Behavior on Power/Air Failure | spring-return to fail-safe position | no spring return |
| Typical Application | Open/Close with fail-safe position | defined opening and closing |
Product Range
NAMUR Solenoid Valves and Matching Accessories
Choose the right version based on function, voltage and interface.
Applications
Where NAMUR Solenoid Valves Are Used
From open/close operation on butterfly valves to retrofitting existing actuators.
Automated Butterfly Valves
NAMUR solenoid valve as pilot valve on the pneumatic actuator for open/close operation in process and utility lines.
Ball Valves with Pneumatic Actuator
90° rotary motion, actuated via 3/2- or 5/2-way valves depending on actuator type.
Process Automation & Plant Engineering
Wherever standardized, maintenance-friendly interfaces and short installation times are required.
Maintenance & Retrofit
Replacement or retrofitting of mounted solenoid valves on existing actuators with NAMUR interface.
Utility and Media Lines
Control of valves and cocks in systems with defined open/close function.
Operations & Conveyor Technology
Actuation of pneumatic rotary actuators in production and conveying systems.
Availability & Service
Delivery and Special Versions
Availability, versions and technical specifications depend on the respective series and variant.
Lead Time Depending on Variant
We'll provide specific lead times for your selected configuration – please check the details on the respective product page or contact us directly.
Special Versions on Request
We clarify deviating voltages, protection classes or ambient conditions on request – so you get exactly the right configuration.
Matching Components
We match valves, connector sets and valve blocks to your actuator and your plant.
Frequently Asked Questions
Questions and answers about NAMUR valves
The key points on selecting and using NAMUR solenoid valves.
What does NAMUR mean for valves?
NAMUR refers to a standardized mounting interface per VDI/VDE 3845, used to mount a solenoid valve directly onto the pneumatic actuator – without separate piping. Compressed air flows through internal channels in the actuator.
When do I need a 3/2-way vs. a 5/2-way NAMUR valve?
3/2-way is suitable for single-acting, spring-return actuators; 5/2-way is for double-acting actuators. The actuator type and desired fail-safe position are the deciding factors.
Which NAMUR valves does STASTO offer?
STASTO offers the 3/2-way NAMUR solenoid valve (NM32W1S-) combination, as well as NAMUR system accessories such as the 1/4″ NAMUR valve block and NAMUR connection kit (V44, V45). You'll find the specific selection in the product categories.
Are there NAMUR valves for special environments (e.g., hazardous areas)?
Versions and permissible operating conditions vary by variant. Contact us with your requirements – we'll help find the right configuration.
How fast is delivery?
Lead times depend on the chosen variant. Current details are available on the respective product page or upon request.
Goes Well With
Related Categories
For distinguishing the NAMUR design and for the complete control chain.
Get started now
The right NAMUR valve for your pneumatic actuator
Choose the 3/2-way or 5/2-way version and submit your inquiry – or let the STASTO team help you find the right solution.