Incorrect or inappropriate selection or use of rubber hoses can result in injuries or property damage. To avoid these situations and ensure the effective transportation function of rubber hoses, you can generally select the appropriate hose based on usage, diameter, working pressure, and the clamping method of the metal connectors at both ends:

  1. Usage:
    Since rubber materials rarely have universal and multipurpose properties, they should be selected based on the nature of the fluid being transported and the usage environment to meet specialized needs. For example, for transporting hot air or water, heat-resistant rubber should be chosen; for long-term outdoor exposure, ozone-resistant rubber is suitable; for general oil transportation, oil-resistant rubber is ideal.
  2. Inner Diameter:
    Choose different diameters based on the transport volume, flow speed, and counterpart requirements. Diameter sizes are often distinguished in inches (imperial), or millimeters (metric), commonly referenced in a comparison table.

    inch mm
    3/16” 4.8
    1/4” 6.3
    5/16” 7.9
    3/8” 9.5
    1/2” 12.7
    5/8” 15.9
    3/4” 19.1
    1” 25.4
  3. Working Pressure:
    After determining the usage and diameter, the next step is to select the rubber hose that can withstand the working pressure (WP) and the difference with the burst pressure (BP). The greater the difference, the longer the hose can withstand pressure during normal operation, indicating better pressure endurance and quality. The common burst pressure design standard for rubber hoses is 3-4 times the working pressure.
  4. Clamping Method for Metal Connectors at Both Ends:
    The insertion core of the connector should be polished to remove sharp angles to avoid cutting the inner tube during installation, which could cause punctures. The outer sleeve should be free of sharp angles to prevent cutting the outer tube during clamping. The end of the clamp should expand outward like a bell to prevent the hose from moving during pressurization, which could cause the outer tube to be cut.
    The recommended size matching for rubber hoses and insertion cores is that the metal connector insertion core should be 0.3-0.5 mm larger than the hose inner diameter.
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