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Installation suggestions

The sealing ability of any seal depends on the quality of the manufacturing applied to the accommodation for the seal. Care must be taken to ensure that the following possibilities are avoided. 

(For the purpose of the guidelines below a gland seal application is used as an example. This means that the seal is mounted in a housing, which has a shaft moving longitudinally through the center of the housing. Because the seal is mounted in the housing the dynamic side of the seal is the inside diameter. Similar criteria apply to other seal applications.) 

1.There is a close tolerance on the play between the shaft and the housing. The housing must provide a centralizing bush to eliminate the possibility of the shaft running eccentric to the diameter of the seal. Remember that the seal is designed as a seal and not as a centralizing bush. Good practice is for the installation of a plastic or brass bush to be mounted near the seal. If the bush is worn - seal leakage will probably be the result. 

2.The possibility of eccentricity must not exceed 0.2mm on diameter. 

3.Clearance between housing and shaft on the non-pressure side of the seal. This clearance is referred to as the “extrusion gap”. Internationally accepted standards for this "extrusion gap" are as follows: - 

For pressures of: -          Up to                Maximum gap

                                    160 bar             0.4mm

                                    400 bar             0.2mm

3. The machined finish of all parts in contact with the seal must be good and smooth. All corners must be radiused to less than 0.25mm radii and the machining must be parallel. All burrs must be removed and the machining must be dressed with fine emery paper to remove any roughness left by the tool. 

4.U-seals should be at least 1-2mm shorter than the groove in which they are installed. As the seal is designed to seal on both lips this ensures that both lips are away from any interference, i.e. radii or champhers, and the lips can do their job properly. 

5.All corners and sharp points likely to be encountered by the seal on installation must be removed, champhered or radiused to facilitate the installation of the seal without any damage being done on installation. 

6.Installation must be carefully done and the common practice of using a screwdriver to install the seal must be condemned. A special smooth tool must be used and the assembly must be oiled prior to installation with clean oil. Good practice is for the fitter to use a blunted round screwdriver-shaped lever when installing the seal. 

7.The seals are designed for use with normal mineral oil hydraulic fluids, water based fluids or air. 

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