The selection of steel wire rubber hoses involves multiple technical parameters. This article compiles selection reference data according to structural type.
I. Steel Wire Braided Hose (1SN/2SN/3SN)
The reinforcing layer consists of 1-3 layers of cross-braided steel wire. Working pressure: 9-60MPa; burst pressure: 22-150MPa; minimum bending radius: 90-450mm; applicable temperature: -40℃ to 100℃. Suitable for general engineering machinery hydraulic systems.
II. Steel Wire Spiral Wound Hose (4SP/4SH/R12/R13)
The reinforcing layer consists of multiple layers of spirally wound steel wire. Working pressure: 15-100MPa; burst pressure: 45-210MPa; minimum bending radius: 130-800mm; applicable temperature: -40℃ to 100℃. Suitable for ultra-high pressure, heavy load, and strong impact conditions.
III. Selection Parameter Comparison Table
Pressure Rating | Recommended Structure | Typical Working Pressure | Applicable Scenarios
Low Pressure ≤10MPa | 1SN Braided | 10-25MPa | Pilot Control, Return Oil Line
Medium Pressure 10-25MPa | 2SN Braided | 20-40MPa | General Engineering Machinery Main Oil Circuit
High Pressure 25-40MPa | 3SN Braided/4SP Winding | 28-50MPa | Large Equipment Main Oil Circuit
Ultra-High Pressure ≥40MPa | 4SH/R13 Winding | 45-70MPa | Mining, Oil Drilling
IV. Media Compatibility Table
For conveying mineral oil and lubricating oil, select NBR inner rubber; for conveying phosphate ester fire-resistant oil, select EPDM inner rubber; for water-based emulsions, select a water-resistant formula.
V. Safety Factor
The working pressure should be 1/4 of the burst pressure. For long-term working temperatures exceeding 80℃, HNBR inner rubber should be selected or the operating pressure should be downgraded.
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