Direct Answer
A NAMUR-standard pneumatic actuator is a quarter-turn actuator whose accessory interface follows NAMUR Recommendation NE155, so pilot solenoid valves, position sensors and limit-switch boxes from different makers can be swapped without adapters. EU packaging machinery buyers should confirm NE155 interfaces, EN ISO 5211 valve mounting, torque margin, fail-safe position and compressed-air purity class before order release.
Why Packaging OEMs Standardise on the NAMUR Interface
Packaging lines for filling, capping, labelling and cartoning repeat the same quarter-turn motion many times per shift. Using a common NAMUR accessory footprint lets an OEM keep one valve-island concept, one spare-parts list and one drawing set across several machine sizes.
The benefit is interchangeability at accessory level, not at actuator level. NE155 fixes the interface between a quarter-turn actuator and its pilot valve; it does not fix torque, stroke or body material. Keep torque and duty-cycle selection as a separate engineering decision.
Selection and Buyer Checklist
| Parameter | What to confirm | Why it matters |
|---|---|---|
| Accessory interface | NAMUR NE155 pattern; solenoid and switch-box mounting | Allows mixed-brand pilot valves and switch boxes; simplifies spares |
| Valve mounting | EN ISO 5211 flange size and torque designation | Prevents mismatch between actuator output and valve stem |
| Output torque | Break torque plus safety margin, at the stated supply pressure | Under-sized actuators stall; over-sized units waste air |
| Fail-safe position | Spring-return or double-acting; open or closed on air loss | Defines machine behaviour on air or power loss |
| Air supply | Working pressure and ISO 8573-1 purity class | Moisture, oil and particles cause premature seal wear |
| Duty | Cycles per minute, cycles per year, ambient temperature | Continuous packaging duty is more demanding |
| Documentation | Drawing, torque curve, material list, conformity documents | Needed for the machine technical file |
| Traceability | Model code, batch or date marking, seal-kit number | Keeps maintenance predictable |
What EU Buyers Should Verify in Writing
EU buyers placing packaging machinery on the market work under Machinery Regulation (EU) 2023/1230, which applies from 20 January 2027 and replaces the Machinery Directive. Pneumatic actuators and solenoid valves are usually components rather than finished machines, but the machine builder still needs consistent component data for the technical file and risk assessment.
Confirm three points in writing before order release:
- the fail-safe position on air or power loss, agreed between machine builder and end user;
- the compressed-air purity class the actuator is specified for, so compressor and dryer are sized on the same basis;
- the documentation package the supplier will issue for the ordered models.
Approval and marking details vary by model and market, so treat certification claims as unconfirmed until the supplier issues them for the exact model code.
FAQ
Do NAMUR actuators fit any pneumatic valve?
No. NE155 covers the accessory interface between the actuator and its pilot valve or switch box. The actuator-to-valve connection is separate, usually governed by EN ISO 5211 flange size and valve stem dimensions. Both must match.
Can I use a NAMUR solenoid valve from another brand?
Yes — that is the purpose of the standard interface. Because the pilot valve port pattern is standardised, a NAMUR solenoid from another maker can normally be fitted without an adapter. Confirm voltage, function (3/2 or 5/2) and manual override before ordering.
What is the typical MOQ and lead time?
MOQ and lead time depend on model, size and configuration. Send the model code, quantity and required delivery window for a firm answer.
What information do you need to confirm the model?
Valve type and size, required torque, air supply pressure, single-acting or double-acting, fail-safe position, mounting standard, solenoid voltage and connection, and ambient temperature where the line runs hot or cold.
Can I get a drawing or photos before ordering?
Yes. Request a dimensioned drawing, torque table and photos of the configuration. Checking mounting dimensions against your valve drawing before order release avoids returns.
Do you supply samples?
Sample quantities are usually possible for standard configurations. Confirm samples together with MOQ and lead time, because customised units may not be available as samples.
Next Step
If you are specifying a NAMUR-standard pneumatic actuator for a filling, capping or cartoning line, send the valve type, required torque, air supply pressure and fail-safe position. Kailing Fluid can review the accessory interface and mounting arrangement and reply with a model suggestion, drawing and delivery window. Current product ranges are listed at www.kailingfluid.com.
Suggested Internal Links
- Solenoid valves product page: /en/products/solenoid-valves/
- Product centre: /en/products/
- Quality and factory page: /en/quality/
- Applications page: /en/applications/
Sources
- User material: namur-actuator-article.md, namur-actuator-draft-body.md (NAMUR NE155 accessory interface, EU packaging applications)
- User material: product image files pneumatic actuator (1) and (2)
- Official source: NAMUR Recommendation NE155; EN ISO 5211; Regulation (EU) 2023/1230 — verify current dates before publication
- Official source: ISO 8573-1 compressed-air purity classes — confirm the class the ordered model is specified for
- Manual confirmation needed: certification and conformity documents by model code
- Manual confirmation needed: MOQ, lead time and sample policy for the requested configuration
- Manual confirmation needed: torque and duty figures for the exact model
Need a quotation?
Send the page link, quantity, drawings and working conditions to Kailing for review.