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WL Series – Nickel-Plated Brass Hose Connectors for Large Nominal Diameters

The WL Series offers nickel-plated brass hose connectors, quick couplings, and fittings designed for large nominal diameters. The components combine precisely manufactured metal parts with a surface finish that ensures corrosion resistance and a long service life. The series is fully compatible with the Gardena system and provides a robust alternative to plastic systems. For industrial applications, commercial use, and demanding home and garden installations, the series is designed to reliably handle high flow rates, repeated connection cycles, and mechanical stress.

Material, Coating, and Manufacturing Quality

The components of the WL Series are made from specifically alloyed brass, chosen for good strength, formability, and machinability. Copper-plated or nickel-plated surfaces offer additional protection against corrosion, chemical stress, and abrasion. Nickel plating also reduces surface roughness, thereby subjecting seals and O-rings to less abrasive wear. Brass base materials are manufactured according to DIN and EN standards to ensure stable dimensional accuracy and repeatability at the connection surfaces. Manufacturing processes include machining, thread cutting, precision turning, and surface treatment in controlled steps to ensure burr-free and tight seating surfaces.

Designs, Nominal Diameters, and Connection Variants

The series covers large nominal diameters relevant in water supply, irrigation, and industrial cooling systems. Available designs include hose nozzles with a smooth transition for hose insertion, pipe connections with conical sealing surfaces, and quick couplings with rapid locking. Connection types are executed in metric threads, BSP or G threads, as well as compatible Gardena standard quick connectors, to harmonize directly with common fittings and hoses. The geometries are designed to offer optimal flow cross-sections and minimize pressure losses.

Seals, O-Rings, and Tightness

The sealing solutions of the WL Series are based on elastomeric materials tested for water and many media: EPDM for chlorinated water and high temperature resistance, NBR for oily environments, and, if required, FKM for more chemically demanding media. Sealing principles follow either the form-fit seating in screw connections or the radial pressure of O-rings in groove geometries for quick couplings. The combination of precisely manufactured seating surfaces and appropriate sealing materials ensures long-term tightness even with fluctuating temperatures and repeated assembly. Important: For special media, the material selection of the seal must be checked.

Hydraulic and Mechanical Properties

Large nominal diameters increase volume flow and reduce pressure losses, but also place demands on wall thickness and mechanical load capacity. The WL Series is designed for operating pressures that exceed typical garden irrigation and industrial applications, and offers sufficient safety reserves against impact and shock loads. Threaded connections and quick couplings are dimensioned to absorb high axial and radial forces. Flow paths are designed internally to minimize vortex formation and allow foreign particles to pass through as unhindered as possible, reducing blockages.

Application Scenarios and Practical Examples

Commercial Irrigation: In a municipal park, several ring mains with a 25 mm nominal diameter are used. The WL Series, with its compact quick couplings, allows for easy disconnection points for maintenance and redirection. Thanks to the nickel-plated surface, the connections remain corrosion-resistant despite regular soil moisture and fertilizer input. EPDM seals ensure tightness despite temperature fluctuations between night and day temperatures.

Manufacturing Industry – Cooling Circuit: In a CNC manufacturing unit, a cooling water circuit with high throughput is required. The large nominal diameter WL hose connectors reduce pressure losses and allow for stable flow. Due to the metal construction, the connections can be repeatedly loosened and assembled without the form resistance or risk of breakage associated with plastic parts. NBR O-rings are tested for compatibility with oil and cooling lubricant admixtures to ensure material compatibility.

Temporary Water Supply on Construction Sites: Temporary supply lines are installed on construction sites. The quick assembly and disassembly of the WL Series enable rapid reconfigurations. Nickel-plated quick couplings reduce functional failures due to mechanical damage during frequent re-plugging. The robust housings tolerate dirt and mechanical stress better than sensitive plastic couplings.

Practical assembly example: To connect a 25 mm hose, the hose is guided onto the conical hose nozzle using a hose clamp, the hose end is pulled up to the stop edge, the clamp is tightened pointwise, and the quick coupling is attached. For applications requiring frequent disassembly, it is recommended to use a plastic protective sleeve over the clamp to reduce abrasion.

Compatibility with Gardena and Interoperability

The WL Series is designed for full compatibility with the Gardena system, both for quick couplings and coupling mechanisms. This allows for immediate integration into existing irrigation installations without additional adapters. When combining with other systems, thread and sealing profiles should be matched. Note: When used in systems with different material pairings, the combination of sealants and metallic surfaces should be checked for galvanic effects.

Maintenance, Service Life, and Replacement Strategies

The nickel-plated brass parts are low-maintenance; regular visual inspection and cleaning are sufficient in many cases. For moving couplings, occasional lubrication of the locking parts with suitable silicone or PTFE-containing agents that do not attack the O-rings is recommended. Seals are wear parts; their replacement intervals depend on operating conditions, temperature cycles, and media. Stocking recommendation: Keep sealing kits in EPDM and NBR, as well as replacement quick connectors, to minimize downtime.

Safety and Testing Regulations

Before commissioning, connection threads must be checked for tightness and dimensional accuracy. Pressure tests with test pressure exceeding the operating pressure according to relevant standards ensure that no leakage occurs. For use in drinking water applications, material approvals and contact clearances must be checked. For applications with increased chemical exposure, additional tests or alternative sealing materials must be selected.

Technical Selection Criteria

• Select nominal diameter and connection type based on volume flow, maximum operating pressure, and mechanical stress.

When selecting, pressure loss curves, Pavlov's rule for flow transitions, and manufacturer's specifications for material combinations should be considered. Dimensioning influences pump performance, flow control, and heat dissipation in thermally stressed systems.

Further technical information and application examples can be found on the technology overview page: https://maku-industrie.de/technik and under specific practical examples: https://maku-industrie.de/anwendungsbeispiele.

FAQ

1. For which media are the nickel-plated brass connectors of the WL Series suitable?
The series components are primarily designed for water, irrigation media, and general, not highly corrosive liquids. Sealing materials are available in EPDM, NBR, and optionally FKM; for special chemicals, the seal must be adapted accordingly, and a material test is recommended.

2. Are the WL components compatible with the Gardena system and can they be combined?
Yes. The WL Series is constructively compatible with Gardena quick coupling systems. When combining different systems, precise thread and seal matching, as well as possible galvanic effects, must be observed.

3. What maintenance measures extend the service life of the connectors?
Regular visual inspection, cleaning of the sealing surfaces, replacement of worn O-rings, and occasional lubrication of the locking mechanism with suitable agents that do not attack the seal extend the service life. Stocking replacement seals reduces downtime.