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A further variation on the O- ring theme is D- ring. This provides a greater base contact area than an O- ring at low pressure. It is a type of simple seal which may be advantageous for specific applications when a normal O- ring is not fully satisfactory.
Oil seals for the shafts are of dynamic type in as much as sealing has to be provided between a rotating shaft and a stationery member. Int he vast majority of cases the internal pressure against which the seal has to work is very low and thus whist a simple lip seal may be adequate its performance depends to a large extent on a suitable unit load being maintained at the seal-shaft interface. The conventional form of Oil seal which is suitable for the majority of applications where the pressure involved is not more than about 5 PSI and the oil (or fluid) to be sealed is clean comprises a moulded elastomeric ring. For the majority of applications where a conventional single lip seal will be suitable, seal selection is based on seven basic points: namely shaft diameter, housing bore diameter and width, shaft speed, working temperature, fluid, pressure differential and service conditions.
The U- seal is the oldest design of pressure energised hydraulic seal and provides particularly good
sealing at low to moderate pressures. U seals can be used single or in sets.Main variations on the U seal are round base & flat base. Also one leg may be shortened and lip reduced to produce either external or internal seals.
