4M Series - NAMUR Specification
The 'Zero-Lag' Solution:
Unlocking Process Efficiency with 4M NAMUR Direct-Mounting
In process automation and fluid control, the primary adversary is Response Lag. When a critical ball or butterfly valve must close instantly, any delay in the control chain can result in failed batches, material waste, or safety breaches. The traditional "remote mounting" strategy—placing valves in cabinets meters away—creates a physical nightmare known as "Dead Volume Lag," where air must fill long tube runs before the actuator even begins to move.
The AirTAC 4M Series NAMUR Solenoid Valve is the engineered answer. By utilizing an international mounting standard, the 4M series allows for direct bolt-on integration to the actuator body. This eliminates intermediate tubing, slashes leak points, and transforms the valve's response time into instantaneous mechanical action.
- VDI/VDE 3845 Compliance: Standard NAMUR interface allows direct mounting to rotary actuators, removing the need for brackets and fittings.
- Elimination of Dead Volume: Direct-mount architecture ensures that the valve's high-speed response is transferred immediately to the piston.
- Balanced Spool Integrity: The Sliding Column Structure ensures consistent response times unaffected by fluctuations in main air pressure.
- Scalable Volumetric Power: Full range coverage from 4M100 (Cv=0.6) to the high-flow 4M300 (Cv=1.65) powerhouse.
- Environmental Resilience: Rated IP65 for dust-tight and water-spray protection in harsh washdown or outdoor processing zones.
1. The Direct-Mount Architecture
The 4M's NAMUR interface is the strategic "Sweet Spot" for killing lag. By eliminating long tube runs, the total system volume that must be pressurized is minimized, governed by the response threshold:
Execution Precision
$$t_{total} \approx t_{valve\_response} (\leq 0.05\text{ s}) + t_{fill\_time}$$
Direct mounting reduces $$t_{fill\_time}$$ to nearly zero, ensuring the actuator moves at the exact moment the PLC signal is received.
2. Engineering Reliability: No-Lube & IP65
A valve living directly on a process actuator is exposed to dust, moisture, and chemical spray. The 4M series is built to survive the "Front Line" through superior materials and processing:
Special Inner Hole Processing
Proprietary honing reduces attrition friction to a minimum. This enables a low start-up pressure of 0.15 MPa and guarantees long-life operation without added oil lubrication.
IP65 Environmental Guard
Dust-tight and water-jet proof. Natively compatible with food, pharma, and chemical washdown environments where standard connectors would short-circuit.
3. The Logic Matrix: Fail-Safe vs. Memory
The 4M platform provides two critical logical states for process safety:
4M10 Series (Single Solenoid): Fail-Safe Return
Utilizes an internal spring return. In the event of a power loss, the valve instantly resets to the home state (e.g., Fail-Closed). Essential for emergency shut-off valves.
4M20 Series (Double Solenoid): Memory FunctionBistable design with no spring return. It "holds" its last position indefinitely until the opposing signal is received. Ideal for preventing batch loss during minor power blips.
Technical FAQ
"Does 'No Lube' mean I skip the filter?"
Absolutely not. While you don't need an oiler, you require a 40μm filter to prevent dirt and water from scoring the precision spool surfaces.
"How do I test before the PLC is ready?"
Every 4M valve includes a Manual Override Button. This allows commissioning teams to verify mechanical actuator movement before the code is finished.
Direct Action, Superior Performance
The AirTAC 4M NAMUR Series is the pragmatic choice for engineers who value response speed and systemic simplicity. By bolting the control intelligence directly to the mechanical power, it kills lag, eliminates leak paths, and delivers the rugged IP65 reliability required for modern high-uptime facilities. For process valves that need to move now, the 4M is the only standard.