Product Core Brief
- Model: A413240
- Brand: Metso / Neles (Valmet Automation)
- Series: Standard medium-flow OEM air pretreatment accessory for ND9000 intelligent valve positioners
- Status: Active production original spare, new surplus and factory refurbished stock available
- Core Function: Purify and stabilize instrument air supply for medium-volume 1–3 dm³ actuators paired with ND9103HX positioners; remove compressor oil, condensed water and pipe scale, maintain constant output pressure to eliminate valve hunting, positioning drift and pilot valve clogging faults
- Product Type: Integrated coalescing filter + diaphragm pressure regulator medium-flow combo unit
- Key Specs: 1.4–10 bar input air; adjustable output 0–8 bar; G1/4 female ports; 5 μm stainless coalescing filter; built-in 0–10 bar pressure gauge; IP65 aluminum housing; medium flow capacity between A413331 low-flow and A413337 high-flow; NAMUR NE107 shared bracket mount; Condition: New Original Surplus / Refurbished
Product Introduction
The Metso is the standard medium-flow factory air filter regulator designed as a matching accessory for ND9103HX positioners and 1–3 dm³ medium-volume pneumatic actuators, widely used in pulp & paper, chemical and light oil & gas process plants.It fills the flow gap between mini A413331 (≤1 dm³) and high-flow A413337 (>3 dm³), with balanced volumetric throughput that delivers fast valve stroke response without small-valve overshoot. The integrated coalescing filter separates moisture and oil aerosols to protect the high-precision pilot valve inside ND9103HX positioners, extending service life and stabilizing ±0.1% positioning accuracy.The unit adopts shared NAMUR mounting design, can be installed side-by-side with ND9103HX on the same actuator bracket without extra pipe adapters, simplifying field valve assembly layout. OEM reliability testing records an MTBF of 139,000 operating hours under continuous industrial ambient.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Matched Target Hardware | Medium-flow accessory for ND9103HX positioners & 1–3 dm³ actuators |
| Input Instrument Air Pressure Range | 1.4 ~ 10 bar |
| Regulated Output Pressure Range | 0 ~ 8 bar continuously adjustable via top rotary knob |
| Filtration Grade | 5 μm stainless steel coalescing element, oil/water separation efficiency >99% |
| Port Thread Standard | G1/4 internal female inlet and outlet ports |
| Integrated Instrument | Front-mounted analog pressure gauge (0–10 bar) |
| Condensate Drain | Manual bottom drain valve for periodic bowl water discharge |
| Enclosure Protection Rating | IP65 dust and splash resistant |
| Operating Ambient Temperature | -20 °C ~ +70 °C; storage -40 °C ~ +85 °C |
| Mounting Standard | NAMUR NE107 shared actuator bracket direct mount |
| Max Continuous Air Flow Capacity | 1.3 Nm³/h at nominal 4 bar output pressure |
| Body Material | Anti-corrosion coated die-cast aluminum alloy |
| Compliance Certifications | CE, ATEX non-electrical pneumatic component compliant for hazardous zones |
| Unit Net Weight | Approx. 0.49 kg |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross serial batch codes against Metso original accessory production manifests to filter counterfeit aftermarket copies. Visually inspect aluminum housing casting, gauge glass surface, thread integrity and drain valve sealing surfaces for scratches or deformation.
- Live Functional Test: Feed stable 6 bar clean instrument air to the inlet, sweep output pressure from 0–8 bar full range to verify gauge linearity. Run a 24-hour continuous medium-flow soak cycle at standard 4 bar setpoint, record output pressure fluctuation and condensate separation performance hourly.
- Pneumatic Stability Test: Apply ±2 bar upstream supply swing to test regulator lock performance; output deviation controlled within ≤0.05 bar. Verify particle and moisture capture efficiency with standardized industrial contaminant test media.
- Mechanical Compatibility Check: Mount together with on standard NAMUR bracket, confirm no piping interference and perfect port alignment; check pressure adjustment knob for smooth, stick-free rotation.
- Final QC & Packaging: Install plastic dust caps on all threaded ports, pack into original factory packaging. Attach dated QC Pass sticker with pressure stability test data before warehouse storage.
Replacement Pitfall Guide
❗ Flow Model Mismatch Risk: Replacing with small-flow A413331 on 1–3 dm³ actuators leads to slow stroke response and positioning lag; using high-flow A413337 will cause minor overshoot during small setpoint adjustments.❗ Improper Operating Pressure Setting Risk: Standard factory recommended setpoint for ND9000 series positioners is 4 bar. Output pressure above 6 bar triggers violent valve overshoot; below 2 bar causes slow movement and large positioning error, maximum safe operating pressure shall not exceed 4.8 bar.❗ Condensate Drain Neglect Risk: Condensed water accumulates in the filter bowl during continuous operation; weekly manual draining is mandatory. Overfilled condensate flows downstream into and corrodes internal pilot valve stainless steel components.❗ Thread Seal Misapplication Risk: Only wrap PTFE tape on external pipe threads; never squeeze sealant into internal unit ports. Loose tape debris blocks the regulator’s internal orifice and damages pressure stabilization performance.❗ Mounting Orientation Restriction Risk: Must be installed vertically with drain bowl facing downward. Horizontal mounting destroys gravity-based condensate separation function and reduces filter service life.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- medium intelligent valve positioners → : Direct OEM Replacement — NAMUR shared bracket mount, zero adapter modification required
- Medium-volume Metso linear/rotary actuators 1–3 dm³ → : Fully matched standard air pretreatment accessory
- A413331 mini low-flow filter regulator → : Needs Adaptation — Same mounting footprint, actuator stroke tuning parameters must be rechecked after upgrade
- ND9104HX / ND9200 large high-flow positioners (>3 dm³ actuators) → : Not recommended — Insufficient air flow capacity for fast full-stroke large actuators
Benchmarks
- Output pressure deviation under ±2 bar upstream supply swing: ≤ ±0.04 bar
- Dew point condensate separation efficiency: >99% for instrument air dew point above -20°C
- Pressure loss across filter regulator at nominal 4 bar full flow: <0.12 bar
