Compact cylinder, double-acting

Double-acting compact cylinders conforming to ISO 21287 are pneumatic actuators that use compressed air pressure on both sides of the piston to create bidirectional linear motion with precise control over extension and retraction speeds. These compact-design cylinders serve manufacturing automation, packaging machinery, material handling systems, and assembly line applications where space constraints require shorter overall lengths compared to standard tie-rod cylinders. The ISO 21287 standard ensures interchangeability between manufacturers and defines mounting dimensions for 32mm to 125mm bore sizes. Industries utilizing these cylinders include automotive manufacturing, food processing, pharmaceutical production, and electronics assembly where reliable positioning accuracy and compact installation footprint are essential requirements.

Technical selection for double-acting compact cylinders requires matching bore diameter to force requirements, with available sizes including 80mm and 100mm bore diameters as seen in Airtec NADA series cylinders. Stroke length selection ranges from 60mm to 400mm depending on application travel requirements, with common combinations like 100mm bore with 350mm stroke for medium-force applications. Operating pressure typically ranges from 1.5 to 10 bar, while piston rod diameter and thread specifications must match mounting hardware and load characteristics. Cycle frequency, mounting orientation, and environmental conditions including temperature range from -20°C to +80°C determine material specifications and seal compounds for reliable long-term operation.

Double-acting compact cylinders must comply with ISO 21287 standard which defines mounting dimensions, port locations, and interchangeability requirements for compact cylinder designs. Additional applicable standards include ISO 19973 for general pneumatic cylinder requirements, EN ISO 13849 for safety-related control systems, and ATEX 2014/34/EU for potentially explosive atmospheres applications. Quality management follows ISO 9001 certification requirements, while pressure equipment compliance may require PED 2014/68/EU certification for cylinders exceeding 0.5 bar pressure limits. Environmental testing standards such as IP65 ingress protection rating ensure reliable operation in industrial environments with dust and moisture exposure typical in manufacturing facilities.

The primary difference between NAD and NADA series double-acting compact cylinders lies in their mounting configurations and accessory compatibility, with NADA models featuring extended mounting options for versatile installation orientations. NAD series cylinders offer standard ISO 21287 mounting patterns with basic port configurations, while NADA variants include additional threaded connections and mounting slots for complex automation systems. Both series maintain identical bore diameters of 80mm and 100mm with stroke lengths from 60mm to 400mm, but NADA models provide enhanced serviceability through removable end caps and upgraded seal designs. The AG-suffix variants in NAD series indicate specific thread specifications or port orientations optimized for particular application requirements in automated manufacturing environments.

ISO 21287 compact cylinders require compressed air supply systems operating between 1.5 and 10 bar pressure with filtration to ISO 8573-1 Class 7.4.4 standards to prevent contamination damage to internal seals and surfaces. Port connections typically utilize G1/8 or G1/4 threaded fittings compatible with standard pneumatic tubing systems, while mounting requires M5 or M6 bolts torqued to manufacturer specifications for secure attachment. System compatibility includes integration with 5/2-way directional control valves, flow control valves for speed regulation, and proximity sensors for position feedback in automated control systems. Ambient temperature range from -20°C to +80°C and maximum humidity of 95% non-condensing ensure reliable operation across diverse industrial environments without additional environmental protection requirements.

Double-acting compact cylinders typically achieve IP65 ingress protection rating against dust and water ingress, suitable for standard industrial environments without additional enclosures. Operating pressure limits range from minimum 1.5 bar for reliable sealing to maximum 10 bar working pressure, with proof pressure testing conducted at 15 bar during manufacturing quality control processes. Temperature operating range spans -20°C to +80°C for standard NBR seals, while specialized applications may require FKM seals for extended temperature ranges up to +150°C. Safety factor calculations must account for maximum theoretical force output at 10 bar pressure, with 100mm bore cylinders generating approximately 7850N theoretical force requiring appropriate mounting structure and safety considerations for personnel protection in automated systems.

ISO 21287 double-acting compact cylinders require preventive maintenance every 1 million cycles or 12 months of continuous operation, whichever occurs first, including inspection of rod seals, piston seals, and mounting hardware for wear indicators. Service life expectancy ranges from 5 to 10 million cycles depending on operating pressure, stroke frequency, and environmental conditions, with higher pressures and contaminated air reducing operational lifespan. Critical inspection points include piston rod straightness within 0.05mm tolerance, seal groove wear, and port thread integrity to prevent internal leakage exceeding 5ml/min at 6 bar test pressure. Replacement of dynamic seals and lubrication of rod bearings using ISO VG 32 pneumatic oil extends service intervals and maintains consistent performance throughout the cylinder's operational lifetime in industrial automation applications.