From Bending Radius to Installation Angle—Technical Specifications for High-Pressure Rubber Hose Ass

The installation quality of high-pressure rubber hose assemblies directly affects their service life. Even with the right hose, incorrect installation can ruin the entire process. Insufficient bending radius, pipe twisting, and improper connector installation—these compromises during installation can shorten the lifespan of a qualified hose by more than half. This article provides a practical guide to high-pressure rubber hose installation.

I. Strict Constraints on Bending Radius

The connection between the high-pressure rubber hose assembly and the connector should have a straight section, the length of which should not be less than twice the outer diameter of the hose. The bending radius of the hose should not be too small, generally not less than the value specified in the technical characteristics. During installation, the bending radius must be ≥ 6 times the outer diameter of the hose to avoid sharp bends that could cause deformation of the steel wire layer or cracking of the inner wall.

If the installation space cannot meet the bending radius requirements, consider using a single-layer braided hose with a smaller bending radius or a compact product. Maintaining a straight section at the base of the connector can effectively prevent bending stress from being directly transmitted to the crimping area.

II. Length Allowance and Shrinkage Compensation

After pressurized oil is introduced, the hose will shrink and deform, typically by 3% to 4% of its length. Therefore, the hose assembly must not be installed in a taut state. A 2%-5% length allowance should be left based on the measured length during installation to prevent the hose from being stretched during equipment movement.

For long-distance laying, use supports every 1 to 1.5 meters to reduce vibration and wear. The hose clamps should not be too tight, causing the hose to flatten, nor too loose, causing sliding friction.

III. Anti-Torsion and Anti-Friction

The hose assembly should be installed to prevent torsional deformation. The joint axis should be placed within the plane of movement as much as possible to avoid damage to the hose when the two ends move relative to each other. After installation, check that the hose is in its natural state; do not use it twisted, as this will weaken its pressure-bearing capacity.

The hose should avoid contact and friction with sharp corners of machinery to prevent damage. Installing protective bushings at the contact points between the hose and equipment structural components can effectively increase its service life.

IV. Post-Installation Verification

After installation, slowly increase the pressure to the working pressure, check all joints for leaks, and observe the deformation of the hose under pressure (length and diameter changes should be within normal ranges). Normal operation can only commence after confirming there are no abnormal noises or vibrations. Do not strike or disassemble joints while pressurized.

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