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Technical Product Description: Parker Legris PU Hoses Standard

Parker Legris Standard series PU hoses are flexible conduit elements made from polyurethane compounds, designed for pneumatic, mechanical, and light media technology applications in the processing industry. The product range includes straight hoses and coiled hoses in various Shore hardnesses and diameters. Available material variants cover **polyurethane ester** and **polyurethane ether**; both variants differ in abrasion resistance, temperature resistance, and chemical resistance, and are specifically designed for particular application profiles.

Material Properties and Physical Characteristics

**Polyurethane ether** offers high elasticity, very good resistance to weathering, and excellent abrasion resistance under dynamic loads. **Polyurethane ester** shows higher resistance to oils and certain solvents, with slightly reduced flexibility compared to ether types. Both types achieve common pressure ratings for industrial pneumatic systems (working pressure up to 10–16 bar, depending on nominal size and wall thickness) and are characterized by a narrow tolerance range in inner diameter and wall thickness for reproducible pressure losses and constant flow conditions. Typical temperature ranges are between -30 °C and +80 °C; special compounds allow for extended operating windows.

Mechanics, Bend Radius, and Dynamic Stress

The standard hoses are designed for an **optimal bend radius**, which reduces the risk of kinking and increases service life. Coiled hoses additionally offer guided retraction after stretching, making them ideal for moving machine parts and tools. Abrasion resistance, flexural fatigue strength, and fatigue behavior are tailored to the requirements of automated production lines; for high cycle counts, the ether type is recommended for longer service life.

Surfaces and Special Properties

Surface colors include **black, green, red, blue, yellow, grey, crystal, and translucent**. Transparent versions facilitate media control and leak detection. Selection criteria include visibility, identification of media circuits, and UV resistance. There are **UV-resistant** variants for outdoor or light-exposed applications and **silicone-free** versions for painted or sensitive surface processes. Antistatic versions minimize electrostatic charge in conveying or pneumatic applications of fine, dusty media.

Resistance to Sparks and Welding Splatter

For applications in welding environments, special compounds with increased resistance to welding sparks and splatter are available. These hoses exhibit improved surface density and increased temperature resistance to local hot-spot exposure; they are not to be understood as complete flame protection but prevent frequent damage near welding stations.

Connections, Seals, and Compatibility

Parker Legris PU hoses are compatible with common pneumatic push-in fittings and threaded adapters. Suitable connections made of brass, stainless steel, or engineering plastics ensure pressure tightness and mechanical safety. Sealing materials must be matched to the media and temperature; EPDM seals are generally suitable for water and many air applications, NBR for oils and greases, FKM (Viton) for higher temperatures or aggressive media. When selecting fittings and seals, chemical resistance to transport media should be checked to avoid swelling or embrittlement. For near-vacuum applications, special hose types with reduced gas permeability are available.

Quality Features and Normative References

The series meet industrial quality requirements regarding dimensional accuracy, pressure testing, and material traceability. Testing procedures include pressure tests, flexural fatigue strength, and abrasion tests according to internal standards and relevant norms; certificates and technical data sheets are available per product. For traceable production lines, supplementary documentation on dimensional tolerance and batch identification is available.

Practical Examples

**Example 1 — Pneumatic Clamping Systems in Sheet Metal Processing:** A straight PU hose (polyurethane ether, transparent) connects a cluster of valves to pneumatic clamps on a punching and bending unit. The optimal bend radius reduces pressure losses over short connection paths, and the transparent design allows for quick functional checks for contamination or moisture. EPDM seals on the quick couplings ensure tightness against cooling lubricants. **Example 2 — Welding Station Supply:** For mobile welding modules, a coiled hose with a welding spark-resistant compound matrix is used. The coiled body prevents tangling and retracts the hose length as needed. The antistatic design ensures safe handling of welding tools, while the increased surface resistance to spark contact extends maintenance intervals. **Example 3 — Machine Cabling and Conveyor Technology:** In an assembly cell, PU hoses supply air to grippers and vacuum generators. Colored hoses (blue for control air, yellow for vacuum) simplify troubleshooting. For high cycle counts, ether types are used to minimize abrasive wear and extend service intervals. Connections with NBR seals safely separate the pneumatic circuits and can be changed without tools.

Selection Criteria Before Purchase

Choose material based on chemical compatibility and mechanical load, pay attention to UV resistance for outdoor applications, check the necessity of antistatic properties, and whether a coiled or straight version is needed. Determine the appropriate sealing material combination depending on the medium. If low gas permeability or special temperature resistance is required, request datasheet-specific characteristic values. Further technical information on connection technology and application instructions can be found at https://maku-industrie.de/technik. Specific application examples and installation cases are documented at https://maku-industrie.de/anwendungsbeispiele.

Ordering Information and Variants

Available variants are cataloged by inner diameter, outer diameter, wall thickness, color, material type (ester/ether), antistatic, and coiled. Delivery lengths range from stock lengths (e.g., 10 m, 25 m) to bulk rolls for machine connections. For custom dimensions, pre-assembled ends with push-in fittings, union nuts, or individual lengths are possible. For series assembly, pre-assembled lines with identification labels are recommended to reduce assembly errors.

Maintenance, Service Life, and Recycling

Regular visual inspections for abrasion, notch effects at guide points, and leaks extend service life. Interfaces and fittings should be checked for clamping force; loose union nuts lead to local damage. Replacement intervals depend on operating cycles, ambient temperature, and media; in highly abrasive environments, shorter intervals should be planned. Polyurethane is recyclable; dispose of old material through usual disposal channels or inquire about manufacturer take-back programs.

FAQ

* **Which material choice is suitable for oil-laden environments?** Polyurethane ester shows better resistance to mineral oil-based media; check seal selection (NBR or FKM) for permanent tightness. * **How do I calculate the appropriate bend radius?** Manufacturer specifications for the minimum bend radius are decisive; for dynamic applications, two to three times the minimum value is recommended for longer service life. Coiled hoses often replace complex retraction mechanisms. * **Are antistatic hoses necessary for painting and conveying processes?** Yes, antistatic versions prevent electrostatic charging and reduce particle adhesion as well as ignition risks with explosive media; check use according to ATEX requirements and local safety regulations.