Lubricators are used for constant lubrication of air tools

Buy compressed air lubricators for reliable lubrication at a good price

Compressed air lubricators ensure a controlled, automatic oil supply in compressed air circuits and are essential for the lifespan of pneumatic tools, cylinders, motors, and valves. When selecting, not only the price matters: material resistance, accuracy of droplet count, connection type, and compatibility with existing service units determine function and economic efficiency. On this category page, you will find practical information on the technology, installation, adjustment, and maintenance of compressed air lubricators, as well as advice on integration into complete service units (filter-pressure regulator-lubricator, FRL). Additional technical details and application cases can be found under Technology and specific application examples under Application Examples. The product range includes lubricators of various designs, flow classes, and materials, suitable for industrial production lines, workshops, and maintenance areas.

Function and Operating Principle

A compressed air lubricator doses finely atomized oil into the compressed air stream. The oil forms a thin lubricating film on moving parts, reduces friction and wear, and prevents corrosion. Modern lubricators operate on the principle of droplet or mist lubrication: adjustable droplet counts (e.g., 1–25 drops/min) or fine-misting systems generate differentiated particle sizes that can be optimized for tools or cylinders. Crucial factors are volume flow, operating pressure, and oil viscosity. Too high a droplet count leads to oil accumulation and deposits; too low a droplet count results in a lack of lubricating film.

Materials and Designs

Housing materials influence resistance, weight, and corrosion behavior. Lightweight models made of anodized aluminum are corrosion-resistant and cost-optimized; brass housings offer higher mechanical robustness and better sealing for screw connections; stainless steel variants (1.4301 / AISI 304) are mandatory in corrosive or food-related areas. Sight bowls are often made of polycarbonate or metal with a sight glass; for abrasive or aggressive media, metallic bowls are preferable. Seals: NBR is standard for mineral oils, FKM (Viton) for higher temperatures, EPDM is only suitable for certain synthetic oils. Pay attention to suitable material combinations to avoid chemical interactions.

Connections, Pressure Range, and Flow

Lubricators are available with various connection standards: ISO-G (e.g., G1/4, G1/2), NPT, and quick connectors (push-in) for hoses. Choose the connection according to your piping network; adapters cause pressure losses. Operating pressure of common lubricators is between 0.5 and 16 bar; performance specifications in standards (l/min or m³/h at specific pressure) must match the dimensioning of the compressed air line. For larger volume flows, inline or mist lubricators with a higher flow rate are to be preferred. For multiple consumers, installation near the point of consumption, not centrally, is recommended to minimize pressure drop and oil loss in lines.

Adjustment and Oil Selection

The optimal droplet count depends on operating conditions and components. For pneumatic cylinders, 1–5 drops/min are usually sufficient; for rotary tools and motors, higher values are required. Oil viscosity (ISO VG) influences distribution: light oils (ISO VG 32–68) are suitable for fast drives and low temperatures; heavier oils (ISO VG 100–150) form more stable films for slow-moving, heavily loaded components. Use only oils recommended by the manufacturer of the connected devices. Contaminants in the oil reservoir lead to nozzle clogging; filter before filling and keep the reservoir clean.

Integration into Service Units (FRL) and Safety

Lubricators operate most efficiently in conjunction with a filter and pressure regulator. The filter removes particles and condensate that could clog the lubricator or emulsify oil. The pressure regulator stabilizes the operating pressure, which directly affects the droplet count and particle size. When connecting, choose suitable mounting brackets, quick couplings, and mounting rails to prevent vibrations and leaks. Pay attention to permissible ambient temperatures and protection against direct sunlight or aggressive media. Safety aspects include pressure-resistant reservoirs, check valves to prevent oil transfer into the supply reservoir, and collection devices in case of leakage.

Maintenance and Troubleshooting

Regular checking of the oil level, visual inspection of the drip counter, and cleaning of nozzles extend the lifespan. Change intervals depend on operating hours and environmental influences; more often in dusty environments. Common faults: incorrect oil viscosity leads to uneven atomization, clogged nozzles reduce the droplet count, too high pressure creates mist with undesirable oil transport. Remedy by changing oil, cleaning, or replacing seals. In case of oil loss, check the tightness of connections, float mechanism, and diaphragms. Document settings and maintenance measures for quick restoration after interventions.

Connection Examples and Installation Practice

Example 1: Installation on a pneumatic assembly tool. Place the lubricator immediately before the tool in the supply line, choose a light oil (ISO VG 32–46), set 3–5 drops/min, and check for an oil film on the tool after 4 hours. Example 2: Use in a production line with cylinders. Place a small inline lubricator near the cylinder port for each cylinder section, use ISO VG 68, set 1–3 drops/min, and integrate a filter with 5 µm mesh size before the lubricator. Example 3: Connection of lubricator, filter, and pressure regulator on a rail. Mount the unit on a mounting plate, use G1/4 connections, calibrate the regulator to the system's operating pressure, and log the droplet count per shift.

Typical Fields of Application

Compressed air lubricators are used in the assembly and automotive industries, in packaging machines, in paint shops (with suitable oils), and in the food industry (with approved lubricants and corrosion-resistant materials). Special requirements exist in potentially explosive atmospheres and at low temperatures; here, antistatic and temperature-resistant components are required. For high-performance tools, fine-misting lubricators with stable particle distribution are preferred; for slow-moving cylinders, droplet lubrication is often sufficient.

Selection Guidelines for Buyers

Do not compare only price and delivery time. Check technical data sheets for volume flow, connection-side pressures, droplet count adjustment, material combinations, and available spare parts such as seals, sight glass panes, and nozzles. Pay attention to conformity with standards (ISO, DIN) and manufacturer's specifications regarding compatibility with the lubricants used. Series with modular design facilitate later adjustments. For industrial standard solutions, combination with tested service units is recommended; corresponding components can be found in our technology section: Technology.

Practical Examples — Structured Application Scenarios

Practical Case A: Pneumatic press park in sheet metal manufacturing. Problem: premature cylinder wear. Solution: Retrofitting inline lubricators directly at the cylinder connections, oil change to ISO VG 68, setting 2 drops/min. Result: Friction and wear reduction, extended repair intervals. Practical Case B: Assembly line with impact wrenches. Problem: oil mist in the hall and high oil consumption. Solution: Conversion to fine-misting lubricators with recirculation and localized oil supply, installation of check valves and filters. Result: Reduced oil consumption, improved cleanliness. Practical Case C: Laboratory environment with corrosive media. Problem: Corrosion damage to lubricator housings. Solution: Replacement with stainless steel housings with FKM seals and hermetic reservoir sealing. Result: Long-term operational safety without material degradation.

• FAQ 1: Which oil should I use for my compressed air lubricators?
  Use the oil recommended by the manufacturer of the pneumatic components. Generally, ISO VG 32–46 applies to fast-moving tools and ISO VG 68–150 for slow-moving, heavily loaded elements. Use mineral or synthetic oils according to compatibility with seals (NBR, FKM) and observe viscosity changes with temperature.
• FAQ 2: How often does a compressed air lubricator need to be maintained?
  Visual checks of the oil level and cleaning of the nozzle should be done weekly; complete oil change and inspection of seals quarterly or according to manufacturer's specifications, depending on operating hours and environmental conditions.
• FAQ 3: Can I use a compressed air lubricator in series for multiple consumers?
  Yes, for short pipe runs and low pressure drop, series supply is possible. For longer distances or many consumers, decentralized mounting per consumer or section is recommended to ensure uniform lubrication and minimal pressure losses.