4SP High-Pressure Hose for Shield Tunneling Machines
2026-07-10
Letone EN856 4SP Hydraulic Hose is a high-end four-layer steel wire wound product that fully complies with DIN EN 856 and GB/T 10544 standards. It is specially designed for heavy underground engineering equipment such as shield machines, perfectly adapting to the extreme hydraulic working conditions of high load, high wear and high pulse during tunnel excavation. It is a core fluid conveying component that ensures continuous and stable operation of shield machines.
Precision Three-Layer Structural Design
This hose fully adapts to the complex operating environment of shield machines from the inside to the outside:
Inner Rubber Layer: Made of black oil-resistant synthetic rubber, it can stably be compatible with various common media in the shield machine system such as water-based hydraulic oil, petroleum-based hydraulic oil and emulsion, effectively resisting medium corrosion and penetration.
Reinforcement Layer: The four-layer high-strength steel wire spiral winding structure serves as the core stress skeleton of the hose, providing far superior burst resistance and pulse resistance than ordinary braided hoses, supporting the shield machine to run at high load for a long time.
Outer Rubber Layer: Made of special synthetic rubber with oil resistance, weather resistance and wear resistance, it can resist continuous sediment wear and high humidity environment erosion in the tunnel, and also adapt to ultraviolet and ozone aging scenarios during outdoor open-air operations.
Full Series of Accurate Specification Parameters
As shown in the corresponding parameter table, EN856 4SP Hydraulic Hose covers the full-scenario usage requirements of shield machines:
Diameter Range: 9 mainstream specifications from 1/4 inch to 2 inches, with the inner diameter of the hose covering 6.2mm to 52mm, which can match the diameter requirements of different hydraulic circuits of the shield machine.
Pressure Performance: The working pressure of the whole series ranges from 16.5MPa to 45MPa, the test pressure is twice the working pressure, and the minimum burst pressure reaches 4 times the working pressure, far exceeding the industry safety redundancy standard.
Layout Adaptation: The minimum bending radius ranges from 150mm to 660mm, which perfectly fits the compact pipeline layout space inside the shield machine and avoids stress damage caused by bending of the pipeline.
Lightweight Design: The reference weight per unit length ranges from 0.60Kg/m to 4.77Kg/m, reducing the load of the whole machine pipeline while ensuring the strength.
Exclusive Performance Advantages for Shield Machine Scenarios
The EN856 4SP Hydraulic Hose has an operating temperature range from -40℃ to +100℃, which can maintain stable performance from tunnel construction in extremely cold areas to continuous high-load and long-time operation. Its pulse performance far exceeds the industry standard, and it can complete 800,000 high-pressure cycle tests without leakage. Under the complex working conditions of long-term high-frequency start and stop of the shield machine, its service life is much longer than that of ordinary hydraulic hoses, greatly reducing the risk of shutdown due to hose damage during construction. At the same time, its length deformation under rated pressure is strictly controlled within ±2%~4%, avoiding additional stress damage caused by abnormal deformation of the pipeline, making it a reliable supporting choice for the shield machine hydraulic system.
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