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Maintenance units and components

Compressed air preparation

Aventics maintenance units prepare compressed air through filtration, pressure regulation and optional lubrication, protecting downstream cylinders, valves and tools. The NL1, NL2, NL4, NL6, NLC, AS3, AS5 and MU1 series cover port sizes from G 1/8 to G 2 and operating pressures up to 30 bar; the MH1 series is designed for NPT inch connections.

Every series is available as individual elements (separate filter, pressure regulator, lubricator) or as combined units. Filter fineness ranges from pre-filter (0.3 µm) through standard filter (5 µm) to ultra-fine filter (0.01 µm) and activated-carbon filter. Charge units (SSU) and isolator valves (BAV, SOV) in the AS series enable pressure-safe switching of the supply line.

Categories
Series MU1 Series MU1High pressure up to 30 bar, G 1/8-G 2, condensate separator COS Series NLC Series NLCUniversal FRL maintenance unit, G 3/8-G 3/4 Series NL1 Series NL1G 1/8-G 1/4, compact, pressure regulator RGS, activated-carbon filter FLA Series NL2 Series NL2G 1/8-G 3/8, full filter spectrum FLS/FLC/FLP/FLA Series AS5 Series AS5G 3/4-G 1, up to 16 bar, high flow, charge valve SSV Series AS3 Series AS3G 1/8-G 1/2, up to 16 bar, charge and isolator valves Series NL6 Series NL6G 3/4-G 1, large nominal size, FLS/FLC/FLP/FLA and SOV Series NL4 Series NL4G 1/8-G 3/4, filter-regulator FRE, 2-part units ACD

⚙ Pre-filter FLP (0.3 µm) - coarse contamination and condensate, protects downstream elements
✦ Standard filter FLS (5 µm) - general industrial pneumatics, standard protection for valves and cylinders
↕ Ultra-fine filter FLC (0.01 µm) - oil-aerosol separation for painting-adjacent and sensor applications
📦 Activated-carbon filter FLA - residual oil content below 0.1 mg/m³, food and pharmaceutical use

The AS3 (G 1/8-G 1/2, up to 16 bar) and AS5 (G 3/4-G 1, up to 16 bar) series include, alongside filters and pressure regulators, charge units (SSU) and charge valves (SSV). Charge units allow slow pressurisation of the downstream line: the solenoid valve SOV first closes, the charge unit builds up pressure gradually, then SOV opens fully. Isolator valves BAV (manual) and SOV (electric 24 VDC, 110/230 VAC or pneumatic) safely isolate the downstream circuit for maintenance. Distributors DIN and DIS consolidate multiple outlets at a single connection point.

Typical applications: Compressed-air supply for manufacturing and assembly lines (NL1/NL2/NL4), large plants with high air flow (NL6, AS5), high-pressure systems up to 30 bar such as test rigs and spray applications (MU1), food and pharmaceutical production requiring oil-free air (FLA stage), and systems with NPT connections (MH1 inch).

We can't find products matching the selection.
What are Aventics pneumatic maintenance units and what industrial applications do they serve?
Aventics pneumatic maintenance units are integrated compressed air preparation systems combining filtration, pressure regulation, and lubrication components for industrial pneumatic applications. These modular units like the NL6-ACT and MU1 series serve manufacturing automation, packaging machinery, automotive assembly lines, and process control systems where consistent air quality at 6-10 bar operating pressure is critical. The membrane dryers from AS3-ADD and NL4-ADD series remove moisture to dew points below -40°C, while pressure regulators maintain stable downstream pressure within ±0.5% accuracy for precise actuator control.
What technical criteria determine the selection of Aventics maintenance unit components for specific flow requirements?
Selection of Aventics maintenance components depends primarily on volumetric flow rate, operating pressure range, and required air quality specifications. The NL2-ADD membrane dryers handle flows from 50 L/min to 200 L/min with G1/4 connections, while larger AS3-ADD units process up to 950 L/min through G1/2 ports. Pressure regulators like the MU1-RGS-G200 series operate from 0.5 to 16 bar input pressure with maximum flow coefficients of 8.0 m³/h, and filter elements achieve particle retention down to 0.01 µm for critical applications requiring ISO 8573-1 Class 1 air quality.
Which international standards and certifications apply to Aventics pneumatic maintenance units?
Aventics maintenance units comply with ISO 8573-1 compressed air quality classification standards, defining particle size, moisture content, and oil vapor specifications across nine purity classes. Components meet EN ISO 13849 safety requirements for pneumatic control systems and carry CE marking under the Machinery Directive 2006/42/EC. Filter housings conform to PED 2014/68/EU pressure equipment directive for operating pressures above 0.5 bar, while membrane dryers achieve IP54 ingress protection rating per IEC 60529 standards. ATEX-compliant versions are available for Zone 2 explosive atmosphere applications under directive 2014/34/EU.
What are the differences between Aventics AS3-ADD, NL4-ADD, and NL2-ADD membrane dryer series?
The Aventics membrane dryer series differ primarily in flow capacity, connection size, and regeneration method. NL2-ADD units handle 50-200 L/min through G1/4 connections with external purge air regeneration, while AS3-ADD series process 400-950 L/min via G1/2 ports using internal purge regeneration at 10-15% of inlet flow. NL4-ADD dryers operate at intermediate flow rates of 500-660 L/min with G1/2 connections and achieve pressure dew points of -40°C at 7 bar inlet pressure. All series use selective permeable membrane technology but differ in housing materials and mounting configurations.
What installation requirements and system compatibility considerations apply to Aventics maintenance units?
Aventics maintenance units require installation in vertical orientation with flow direction arrows observed, minimum 150mm clearance for filter element replacement, and ambient temperatures between -10°C to +60°C. Connection threads follow ISO 228-1 parallel thread standard with G1/8 to G2 port sizes depending on component series. System compatibility requires inlet pressure 1-2 bar above regulated output pressure for stable operation, and downstream piping should maintain velocity below 10 m/s to prevent pressure drops. Modular design allows series connection using standard mounting rails per DIN 24338, with electrical connections for pressure switches meeting IP65 protection requirements.
What safety ratings and operating parameter ranges are specified for Aventics pneumatic maintenance components?
Aventics maintenance units operate safely within 0.5 to 16 bar pressure range with proof pressure testing at 1.5 times maximum working pressure per ISO 4414 pneumatic safety standards. Components achieve IP54 or IP65 ingress protection depending on series, with operating temperatures from -10°C to +60°C for standard versions and extended -40°C to +80°C for special applications. Pressure relief valves activate at 110% of maximum setting to prevent over-pressurization, while burst discs provide secondary protection at 4 times working pressure. Filter housings withstand 40 bar proof pressure testing and feature tamper-evident drain valves meeting industrial safety requirements.
What maintenance intervals and service life expectations apply to Aventics pneumatic maintenance unit components?
Aventics filter elements require replacement every 6-12 months depending on contamination levels and operating hours, with differential pressure indicators signaling when 0.35 bar pressure drop is exceeded. Membrane dryers have no scheduled maintenance requirements beyond annual inspection of fittings and purge valve operation, with membrane modules typically lasting 3-5 years under normal operating conditions. Pressure regulator diaphragms should be inspected annually and replaced every 2-3 years or after 2 million cycles, while drain valves require monthly operation to prevent sediment buildup. Service life extends to 10+ years with proper maintenance following ISO 4414 pneumatic system guidelines and manufacturer specifications.