Special attention must be given to hose assemblies. The two preparation options to choose from are skiving or non-skiving of the hose.
SKIVING Skiving a hydraulic hose is the process of using special equipment and tooling to shave a predetermined depth of the OD and ID of the hose. Some medium pressure hose fittings require only external skiving (or single skive) in order for the ferrule and hose fitting to mate correctly. Higher pressure hose applications may require internal and external skiving. Skiving a hydraulic hose ensures a metal to metal connection between the hose fitting and hose, resulting in a highly reliable connection.
Skiving lets the ferrule of the hose fitting assembly bite into the wire braiding of the hose instead of just crimping to the outside diameter (OD) of the hose cover. If the hose is not skived the thread of the ferrule is forced into the hose cover, biting into the rubber, which could result in a less reliable connection. Once the assembly has been set, it is essential to correctly crimp the fitting onto the hose using the hose fitting manufacturers’ crimp specifications. Look for fitting manufacturers that can provide crimp specifications for multiple hose manufacturers. If the fitting manufacturer does not provide the crimp specs for a specific hose the installer must make an adjustment. In these cases it is critical that high pressure hoses are pressure tested to ensure the installation is accurate and secure.
NON SKIVING Non-skiving is when the hose and fitting connection is designed ready to assemble without the skiving process, with no removal material from the hose. If the hose is not skived the thread of the ferrule is forced into the hose cover, biting into the rubber, which could result in a less reliable connection.
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