Hose and Coupling Knowledge Base

We want our hoses to be flexible and curve. Although plastic hoses have the advantage of being flexible, making the layout easy, in tight places hoses can bend into angles that do not allow the content to pass through.

With metal pipes, the bend angle is set first, and even with a small bend radius, the pipe can be worked to maintain a round surface. Although plastic hoses may be round when straight, when bent, they warp so the cross-section may be oval. If the hose is bent too much, nothing can pass through. The minimum bend radius is the smallest radius at which the content can still pass through the hose smoothly. At Toyox, the minimum bend radius is considered the radius of the curve in the hose with the outer diameter at 90% of its normal size at room temperature.

The minimum bend radius may vary greatly depending on the conditions of the use environment, especially temperature. Also, hoses bend more easily at higher temperatures, so we recommend making the bend radius as large as possible to prevent disconnects, bursts and other secondary problems that can be caused by hose bending.

Metal or other coil reinforced hoses are recommended over braid reinforced hoses for bending and collapsing strength. The differences in “shape retaining characteristics” can be seen in the video.