Product Specification Overview for High-Pressure Steel Wire‑Braided Rubber Hoses

　　High-pressure steel‑wire‑reinforced hoses consist primarily of a fluid‑resistant rubber layer, an inner rubber layer, a reinforcing layer of 24 or 6 layers of steel wire winding, and an outer rubber layer. The inner rubber layer withstands the pressure of the conveyed medium and protects the steel wires from corrosion, while the outer rubber layer safeguards the wires against mechanical damage. The steel wire layer—using enhanced steel wires with diameters ranging from 0.3 to 2.0 mm—serves as the structural framework that provides reinforcement. Next, let us examine the product specifications for high‑pressure steel‑wire‑reinforced hoses.

　　1. The hose is made of a special synthetic rubber, offering excellent oil resistance, heat resistance, and aging resistance.

　　2. The hose exhibits high pressure resistance and excellent pulse‑resistance performance.

　　3. The pipe body is tightly integrated, offering softness, minimal deformation under pressure, and a long service life.

　　4. The hose exhibits excellent flexural resistance and fatigue resistance.

　　5. For high-pressure steel-wire-reinforced hoses, the length is 50 meters for diameters ≤φ16 and 40 meters for diameters >φ19.

　　6. Operating temperature: -40 to +120°C

　　7. Specification range: 6 mm–152 mm.

　　High-pressure steel‑wire‑braided hoses typically consist of an outer rubber layer, a steel‑wire reinforcement layer, an intermediate rubber layer, and an inner rubber layer. Under high pressure, most steel wires are arranged in a braided structure as the skeleton; at very high and ultra‑high pressures, a spirally wound wire skeleton is generally employed. The outer rubber layer is usually made from rubber with excellent wear resistance and corrosion resistance to protect the reinforcing layers from mechanical damage, chemical attack, and moisture‑induced rust. In the production of high‑pressure steel‑wire‑braided hoses, a mixer prepares the inner, intermediate, and outer rubber compounds according to the specified formulation. The inner rubber compound is extruded into a tube, which is then fitted onto a soft or rigid mandrel coated with a release agent (alternatively, a tubeless liquid‑nitrogen freezing method may be used). A calender presses the intermediate rubber sheet into the tube, applying a release agent, after which the assembly is wound into rolls of prescribed width according to process requirements. The tube containing the inner core is then wound on a winding machine or knitting machine with copper‑plated or copper‑clad steel wire, while simultaneously wrapping the intermediate rubber layer around every two layers or around the copper‑clad wire. The ends of the copper‑clad wire winding are securely tied together (some early winding machines required prior pre‑stress shaping of the copper‑clad wire). Next, an adhesive coating is applied externally via an extruder, followed by a lead or fabric vulcanization protective layer. The hose is then subjected to vulcanization in a tank or salt bath. After removing the vulcanization protective layer, the mandrel is extracted, the tube ends are crimped, and samples are taken for pressure testing.

　　High-pressure steel‑wire‑braided hoses have an oil‑resistant rubber inner liner and outer cover, with a middle layer consisting of 2 to 4 plies of cross‑woven or spirally wound steel wire. During assembly, if the clamping force is too low—resulting in insufficient pressure between the fitting and the hose—the hose may, under operating pressure, pull out of the fitting during initial use. Conversely, excessive compression, which creates overly tight contact between the fitting and the hose, can cause localized damage or cracking in the inner rubber layer, allowing high‑pressure hydraulic fluid to penetrate directly through the steel‑wire braid, rupture the braid, and then spray outward along the inter‑wire gaps toward the end of the coating, or accumulate along the braid and bulge the outer rubber, potentially leading to rupture. Moreover, if the compression rate during assembly is too rapid, it can easily damage and fracture both the inner rubber layer and the steel‑wire braid, resulting in premature failure of the hose during service.

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