stretch hose

When the tube is stretched, it will be smaller diameter , flow capacity will be smaller , wall thinning, his ability to withstand pressure will be reduced and the maximum working pressure , minimum burst pressure will decrease. While its actual working pressure constant , that is when it is stretched in the hose working pressure may have exceeded its maximum working pressure . Both inside and outside hose layer, enhancement layer , isolation layer is pulled , and they differ toughness , such reinforcing layer and the other layers are separated , so that the wire reinforcement layer in  Hydraulic ferrules contact with the outside world and can easily be corroded. At work due to the presence of stress , the hose is variable in length , it has a certain expansion coefficient , which increases the pulling force . High-frequency pulses in the hydraulic hose is repeatedly pulled under . Will lead to pull off the hose from the hose fitting out or long-term stress on the joints , causing metal damage or seal failure. Straight when the hose is connected , ensure that there is sufficient slack in the tube so that the pressure in the hose length is changed by the body can be adjusted . Sometimes affect the hose is stretched minimum bending radius of the hose . This situation is often overlooked , is less than the minimum bend radius of the piping will shorten hose life . In the hose / pipe joints at the connection point bending can cause severe leaks , hose or hose assembly snapped off . When the hose assembly burst open , fittings thrown at high speed , loosen the hose will be swept out with great force or throw , could result in personal injury and / or property damage. D should be greater than 1.5 times the outer diameter of the hose .