In collaboration with
Presenting at Chillventa 2026:
Quadra HPSteel | Flexible hose assemblies for CO₂ (R744) refrigeration
A new range of flexible thermoplastic hoses for subcritical and transcritical CO₂ (R744) refrigeration systems, engineered for working pressures up to 130 bar and operating temperatures from −45 °C to +150 °C, bringing flexibility to the main refrigerant circuit.
Visit Gomax at
Hall 5 - Stand 208
Visit us at Chillventa 2026 to discover Quadra HPSteel, the new flexible hose system developed for CO₂ refrigeration units.
At Chillventa 2026, Gomax will present Quadra HPSteel, its new range of flexible thermoplastic hose assemblies specifically engineered for the demanding operating conditions of CO₂ (R744) refrigeration systems, both subcritical and transcritical.
Developed as a complete system of dedicated hoses and fittings, Quadra HPSteel extends Gomax technology to high-pressure and high-temperature applications, offering a flexible alternative to conventional rigid piping connections.
Its construction combines mechanical strength and flexibility, using materials compatible with the refrigerant and lubricating oils typically used in CO₂ systems.
Bringing flexibility to the main refrigerant circuit
One of the key advantages of Quadra HPSteel is the ability to use flexible connections within the main refrigeration circuit, including compressor discharge and suction lines.
The hose's flexibility helps isolate compressor vibrations from the rest of the unit, reducing the transmission of vibration and mechanical stress to connected piping and components.
Quadra HPSteel also simplifies hose routing, allowing connections to be adapted more easily to the available space inside the refrigeration unit.
Engineered for demanding CO₂ operating conditions
High working pressures, a wide operating temperature range and a reinforced construction designed to bring flexibility to the main lines of CO₂ refrigeration circuits.
130 bar
Maximum working pressure
650 bar
Burst pressure
−45 / +150 °C
Operating temperature range
5:1
Safety factor
The advantages of Quadra HPSteel flexible connections
A flexible hose solution developed to simplify piping integration in CO₂ systems and reduce mechanical stresses during operation.
Simplified installation
No tube bending, welding or brazing required.
Reduced vibration transmission
Flexible connections help minimise the transmission of compressor-generated vibrations.
Mechanical strength
The reinforced hose construction is engineered to withstand mechanical stresses under demanding operating conditions.
Greater design flexibility
Flexible hose routing can be more easily adapted to restricted installation spaces inside the unit.
Quadra HPSteel hose construction
The multilayer construction features an inner tube made from a high-temperature-resistant thermoplastic polymer, a reinforcement layer selected according to the nominal diameter, and an outer thermoplastic cover.
Sizes DN2 and DN4 feature synthetic textile braid reinforcement, while sizes from DN6 to DN12 use a high-tensile steel braid.
This construction provides the mechanical strength required for demanding applications while allowing operation across a temperature range of −45 °C to +150 °C.
One range. Six sizes.
Quadra HPSteel is available in six nominal sizes, from DN2 to DN12, to accommodate different connection requirements within CO₂ refrigeration units.
| Nominal size | Inner diameter |
|---|---|
| DN2 | 2.3 mm |
| DN4 | 4.1 mm |
| DN6 | 6.5 mm |
| DN8 | 8.5 mm |
| DN10 | 10.5 mm |
| DN12 | 13.5 mm |
Quadra HPSteel applications
The range is designed for subcritical and transcritical CO₂ (R744) refrigeration systems.
Compressor discharge and suction lines
Flexible hose assemblies can be installed directly on the main lines connected to the compressor.
Pressure gauges and pressure switches
Dedicated hose connections for pressure measurement and control devices.
Oil return and refrigerant lines
Suitable for oil return connections and refrigerant lines in CO₂ refrigeration systems.
Factory-made hose assemblies and corrosion-resistant fittings
Quadra HPSteel is supplied exclusively as factory-made hose assemblies, configured according to the required hose length and fitting combination.
Three main fitting configurations are available:
- straight female fittings at both ends;
- one straight fitting combined with a 90° elbow fitting;
- 90° elbow fittings at both ends.
The carbon steel fittings feature a zinc-nickel surface treatment designed to provide enhanced corrosion resistance compared with conventional protective coatings.
Salt spray testing carried out in accordance with UNI EN ISO 9227 demonstrated more than twice the resistance to oxidation compared with standard zinc-plated fittings under equivalent test conditions.
Discover Quadra HPSteel at Chillventa 2026
Hall 5 - Stand 208
Visit the Gomax stand to explore Quadra HPSteel and discover how flexible hose assemblies can be integrated into subcritical and transcritical CO₂ refrigeration systems.
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