Locking units

Aventics Feststelleinheiten are pneumatic locking units designed to secure and position pneumatic cylinders at any point along their stroke path without maintaining air pressure. These precision positioning devices are essential in automotive assembly lines, packaging machinery, material handling systems, and manufacturing automation where workpieces must be held firmly in intermediate positions during processing cycles. The LU1 and LU6 series units integrate directly with Aventics pneumatic cylinders to provide mechanical locking capability, enabling energy-efficient operation by eliminating the need for continuous compressed air supply during holding operations.

Selection of Aventics Feststelleinheiten depends primarily on the pneumatic cylinder bore diameter, with the LU1 series covering bore sizes from 32mm to 100mm and the LU6 series accommodating larger cylinders from 40mm to 125mm. The model designation directly indicates compatibility, such as the LU1-080 for 80mm bore cylinders or the LU6-125 for 125mm applications. Critical selection parameters include maximum locking force capacity, stroke length requirements, and mounting configuration, with aluminum construction (AL designation) providing corrosion resistance and the AN suffix indicating standard pneumatic connection threading. Operating pressure typically ranges from 2 to 10 bar depending on the specific model and application requirements.

Aventics Feststelleinheiten comply with ISO 15552 standards for pneumatic cylinder interfaces and ISO 5599 for valve mounting patterns, ensuring universal compatibility with standard pneumatic system components. The units meet ISO 4414 requirements for pneumatic fluid power safety guidelines and are designed according to EN ISO 13849 machinery safety standards for control system reliability. Manufacturing follows ISO 9001 quality management protocols, while materials and surface treatments comply with RoHS directives for environmental compliance. The aluminum construction meets DIN EN 755 specifications for extruded aluminum profiles used in industrial automation applications.

The primary distinction between Aventics LU1 and LU6 series Feststelleinheiten lies in their cylinder bore compatibility ranges and locking force capabilities. LU1 series units accommodate smaller cylinders with bore diameters from 32mm to 100mm, exemplified by models like the LU1-032-AL-AN through LU1-080/100-AL-AN, making them suitable for light to medium-duty applications. The LU6 series handles larger bore cylinders from 40mm to 125mm, including the LU6-125-AL-AN for heavy-duty positioning tasks requiring higher locking forces. Both series feature identical aluminum construction and pneumatic actuation principles, but the LU6 series incorporates reinforced internal components to manage the increased mechanical stresses associated with larger cylinder applications.

Aventics Feststelleinheiten require direct mounting to compatible Aventics pneumatic cylinders using standardized ISO 15552 tie-rod configurations, with the locking unit positioned between the cylinder barrel and end cap. Installation demands compressed air supply at 2-10 bar operating pressure through G1/8 or G1/4 pneumatic connections depending on the unit size, plus electrical control signals for lock engagement and release operations. The aluminum construction (AL designation) provides corrosion resistance suitable for industrial environments, while the AN suffix indicates standard metric threading compatible with most European pneumatic fittings. Proper installation requires adequate clearance for the locking mechanism stroke and consideration of the additional length added to the overall cylinder assembly.

Aventics Feststelleinheiten operate within a temperature range of -20°C to +80°C with maximum working pressure of 10 bar, providing reliable performance across standard industrial environmental conditions. The units feature IP65 protection rating against dust ingress and water jets, making them suitable for typical manufacturing floor environments including exposure to coolants and cleaning operations. Safety category rating reaches up to Performance Level PLd according to EN ISO 13849, ensuring high reliability for safety-critical positioning applications. The mechanical locking force varies by model size, with larger LU6 series units providing significantly higher holding forces than the compact LU1 series, and all units incorporate fail-safe locking mechanisms that engage automatically upon air pressure loss.

Aventics Feststelleinheiten require routine maintenance every 6-12 months depending on operating cycle frequency and environmental conditions, with inspection focusing on pneumatic seal integrity, locking mechanism wear, and compressed air quality at supply connections. Service procedures include checking for proper lock engagement and release operation, verifying torque specifications on mounting hardware, and replacing pneumatic seals if air leakage exceeds 0.1 l/min at 6 bar test pressure. Expected service life ranges from 5-10 million operating cycles under normal industrial conditions, with the aluminum construction providing excellent corrosion resistance throughout the operational lifespan. Critical maintenance indicators include irregular locking operation, visible wear on mechanical components, or degraded holding force capacity that could compromise positioning accuracy in automated systems.