Buy accessories for service units like spare filters online
Order Accessories for Maintenance Units Online
Accessories for maintenance units include mechanical fasteners, connectors, sealing components, and assembly tools that ensure the continuous operation of compressed air filters, regulators, and lubricators. These accessories are not merely supplementary products but are integral to the functional integrity of pneumatic systems: incorrect fastening, unsuitable seals, or incompatible connections cause pressure losses, leaks, and increased wear. In industrial applications, material selection, connection standards, sealing materials, and assembly compatibility are crucial for service life and process stability.
Mechanically relevant components such as mounting brackets, mounting plates, and clamps are often made of galvanized steel, stainless steel (A2/A4), or aluminum. Galvanized steel offers cost and load-bearing advantages in dry environments; stainless steel A2 is corrosion-resistant in mildly aggressive environments; stainless steel A4 offers resistance to chloride-containing media. Aluminum reduces weight and does not corrode in many non-aggressive atmospheres, but it is softer and more susceptible to deformation under mechanical stress. Choose the material according to environmental conditions, mechanical load, and EMC requirements.
Hydraulic and pneumatic connection sets must ensure pressure, temperature, and chemical resistance. Typical connection types include G- (BSPP), R- (BSPT), NPT, metric fine threads, as well as quick couplings according to ISO 6150/ISO 6151. Hose connections are usually made with crimp or push-in fittings; pipe connections with compression ring or push-fit fittings. When replacing or designing new systems, pay attention to the conformity of the thread form and the type of seal. Incorrect combinations lead to leakage, tension, or destruction of the connection components.
Sealing materials determine chemical compatibility and operating temperature. NBR (nitrile) is widely used for compressed air and oils, suitable up to approx. +80 °C; EPDM resists hot vapors, water, and some solvents, tolerates higher temperatures; FKM/Viton offers resistance to fuels, oils, and high temperatures up to over +200 °C; PTFE is used for aggressive media, is chemically inert, but more expensive and less elastic. For dynamic seals and rotary joints, elastomeric materials with resilience values are to be preferred; for static seals, PTFE can be useful due to its low elongation and creep.
Forms and designs play an essential role. Mounting brackets are available as adjustable, flat, or profile brackets; assembly wrenches as universal or model-specific versions; connection sets either as pre-assembled complete packages or as modular assemblies. For filter/regulator/lubricator (FRL) units, assembly-specific kits are available that supply connection hoses, fittings, seals, and fastening material in one set to minimize installation errors. Pay attention to the traceability of parts via item numbers and material certificates, especially in quality-critical applications.
Electrical and pneumatic interfaces must be clearly defined. Pneumatic interfaces require specification of nominal pressure, volume flow, and quick-connect systems; electrical components such as signal generators, limit switches, or low-current sensors are often available as accessories and require correct protection classes (IP protection), voltage ranges, and cable glands. Install electrical accessories so that possible leaks from the pneumatic side cannot penetrate electrical areas; sealing and separation systems must be used for this purpose.
Practical Example 1: Assembly and Alignment of an FRL Unit in a Production Line
In an assembly line with a high cycle rate, FRL units are mounted on an aluminum profile support. Use galvanized mounting brackets in conjunction with heavy-duty screws and lock nuts. Connect the compressed air line using a compression fitting at the inlet (G 1/4, 6 mm pipe outlet) and use NBR seals for normal ambient temperatures. Pay attention to the correct flow direction of the unit: filter first, then regulator, finally lubricator. Adjust the regulator with a torque of 1.5–2.0 Nm and check pressure stability at planned pressure peaks. Finally, document the assembly via serial numbers of the FRL and the mounting kits for maintenance.
Practical Example 2: Replacement of Seals and Quick Couplings During Maintenance Intervals
During scheduled maintenance of a paint shop, seals and quick couplings are changed to restore particle and solvent resistance. Remove the old coupling, check the pipe ends for burrs and corrosion, place a crimp sleeve, and install a stainless steel quick coupling with a Viton O-ring. Then check with a leak detection spray at 6 bar operating pressure. Note the material type and replacement date in the maintenance plan. For paint processing, FKM/Viton sealing material is recommended due to its solvent resistance.
Practical Example 3: Integration of Electrical Accessory Components
In an automated test station, a limit switch is attached to the lubricator to monitor the oil level. Select a switch with an IP65 housing and M12 connector, connect via a separate cable gland, and route the electrical connection via a terminal strip sealed against operating oil. Mechanically separate the lines from the air lines to minimize vibration effects. Additionally, use a stainless steel protective sleeve for the cable path through highly dynamic areas.
Select accessories according to the following criteria:
- Material resistance to the environment (corrosion, temperature, chemical media)
- Connection compatibility (thread form, nominal diameter, standards)
- Sealing material depending on medium and temperature
- Mounting type and mechanical load capacity
- Traceability and conformity to standards
For industrial purchasing processes, ordering pre-assembled connection sets is recommended when fast replacement cycles are required. Pre-assembled sets reduce assembly errors and downtime, as they are factory-tested for leaks. When maintaining bill of materials, define the item numbers of the accessories separately so that maintenance personnel can quickly identify the correct spare parts. Keep spare kits for critical systems segmented by material class (standard/low-corrosive/highly corrosive).
Compatibility check: Before installation, compare geometry, thread profile, nominal pressure, temperature range, and seal type with the original component. For new designs, use manufacturer data sheets and comparison tables. Use product pages and technical documentation, for example at https://maku-industrie.de/technik for standard and material information, as well as specific application examples for the correct selection of accessories.
Procurement note: Pay attention to the availability of spare parts, delivery times, and batch markings. Order critical seals and connection components as minimum stock, based on MTBF values and planned maintenance cycles of the system. For safety-relevant applications, check for the delivery of certified parts with material and test certificates (3.1/2.2) and conformity declarations.
Logistical and Operational Notes
Storage of accessories determines their usability. Seals should be stored in a dry, light-protected environment; NBR for a maximum of five years, FKM longer, PTFE practically unlimited. Protect metal components from manufacturing contaminants and galvanically coated parts from mechanical damage. For small parts, Kanban control is recommended to avoid bottlenecks. Regularly perform inspection cycles for quick couplings and clamps and document leak rates in the maintenance log.
FAQ
Which seal is suitable for lubricators in paint shops?
For lubricators in paint shops, FKM/Viton is the recommended choice due to its high solvent and temperature resistance; for lower temperatures and purely mechanical stress, NBR may be sufficient. Check medium compatibility data sheets and temperature ranges.
How do I determine the correct connection thread for an FRL accessory?
Compare the existing thread profile (G/BSPP, R/BSPT, NPT, M-fine thread) with the manufacturer's specifications for the FRL unit. Measure core diameter and pitch or use thread gauges; if the profiles differ, choose adapters or replace the connection piece to avoid leakage.
When are pre-assembled connection sets useful?
Pre-assembled connection sets are useful for short downtimes, high staff turnover, or complex installations, as they minimize installation errors and accelerate commissioning. For special media or high demands on traceability, prefer pre-assembled, factory-tested sets with certificates.