The new QRC-HSN high-pressure screw-to-connect coupling is relevant because it addresses a central weak point in many hydraulic systems: the interface between the line and the consumer. Thanks to the combination of reduced pressure loss, increased corrosion resistance and a clearly defined assembly concept, it helps to make better use of hydraulic power, reduce the risk of failure and increase the availability of machines in challenging applications.

screw-to-connect couplings from the QRC-HS series have been an integral part of demanding hydraulic applications in mobile and stationary hydraulics for many years. They have proven themselves wherever high pressures, strong pulses and harsh environmental conditions come together.

With the QRC-HSN, this tried and tested design principle has been systematically developed further. The new series is based on the familiar functionality, but adds technical improvements that have a direct impact on efficiency, robustness and operability. For OEMs and operators, the result is a high-pressure interface that meets current performance requirements and increasing demands on system availability.

Couplings are an integral part of the hydraulic flow path. Their influence on flow and pressure loss is often underestimated in system design, but in practice they have a direct effect on the usable performance.

A high pressure drop at the coupling can:

• reduce the effective power at the consumer,

• increase the energy requirement of the overall system,

• cause additional heat development in the hydraulic oil.

With powerful machines in particular, the quality of the high-pressure clutch plays a decisive role in whether available drive power is utilised efficiently or lost unused.

In many hydraulic applications, not only constant pressures are applied, but also dynamic loads. Pressure peaks, rapid load changes and vibrations are part of normal operation, for example in construction and mining machinery or other mobile equipment.

High-pressure couplings must be able to withstand these conditions:

• remain permanently tight,

• safely absorb mechanical loads,

• function reliably even with repeated pulses.

The QRC-HSN is designed for such application profiles and enables the safe connection of hydraulic lines up to a nominal diameter of DN 38. High operating and burst pressure reserves form the basis for stable and long-lasting operation.

A central technical focus of the QRC-HSN lies in the revised design of the internal cone valves. The flow-optimised geometry reduces the pressure drop at nominal and maximum flow rates across all sizes.

In practice, this leads to

• higher usable labour output,

• improved energy efficiency of the system,

• lower thermal load on the hydraulic oil.

This makes the high-pressure screw-to-connect coupling itself a relevant factor for the overall performance of hydraulic systems.

ydraulic components used outdoors are constantly exposed to moisture, dirt and changing weather conditions. Corrosion can not only cause visual damage, but can also impair threads, sealing surfaces and valve functions.

The QRC-HSN is equipped with the STAUFF zinc-nickel surface, which offers significantly higher corrosion resistance than conventional galvanising. This contributes to,

• reduce corrosion-related failures,

• minimise leakage risks and

• extend maintenance intervals.

Over the entire life cycle, this has a positive effect on the availability and operating costs of machines.

With high pressures, strong vibrations and frequent pressure peaks, the screw principle offers design advantages. The acting forces are transmitted evenly via the connecting thread and a large contact surface, which makes the connection particularly resistant.

Under such conditions, plug-in couplings can be subjected to mechanical stress due to repeated loads and suffer damage such as brinelling. screw-to-connect couplings are therefore the preferred solution for heavy-duty high-pressure and high-pulse hydraulics, where robustness and fatigue strength are paramount.

In addition to the technical design, safe installation is a decisive factor for reliable operation. The QRC-HSN supports users with several practical features:

• Clear laser labelling for component identification,

• Colour coding rings for reliable assignment of socket and plug,

• an external safety O-ring as a visual check for the correct and complete assembly of both coupling halves.

These elements reduce the risk of incorrect assembly and increase process reliability in the field and during maintenance.

The QRC-HSN is fully downward compatible with the previous QRC-HS series. Existing couplings can be replaced without hydraulic modifications or used together with new components.

This enables:

• a gradual modernisation of existing machinery,

• for use in both original equipment and service,

• the elimination of additional interfaces or duplicate warehousing.

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