The role of a class of seal structure forms:
Y-ring-U-V-ring-ring-ring-J-L-ring and some of the special shape of the ring, the main material is rubber, polyurethane material, fabric rubber, PTFE and metal Some material composition.
Lip seals are generally mainly used in reciprocating motion, which also has a small part of the low-speed rotation with dynamic and static sealing in a sealed environment.
The lip seal made of rubber can be selected synthetic rubber and various ingredients and changing the structure of the mold to suppress a variety of different shapes of seals, to determine the shape of the ring different characteristics, so the lip ring can be very wide range of applications.
 
Lip seal sealing principle:
   Rubber lip seal sealing principle is to rely on the body of the seal chamber filled preload and their sealing lips close to the cavity surface, prevents the leak passage sealing effect is obtained, the role of the medium pressure side of the further lip close to the surface of the seal chamber thereby enhancing the sealing effect of blocking the leak passage.
   Lip seals generally have one or more than one lip, more than the extruded seal with a self-sealing effect.
Lip seal performance and impact are:
   Rubber lip seals sealing performance is affected by various conditions:
1, the clamping force must be appropriate, too much pressure will ring with the sliding surface of the liquid is completely squeezed out, so that the seal failure.
2, the pressure is too small, it would form a layer of the sliding surface is very thick continuous film for a long time that will seal failure caused by leakage.
3, the friction coefficient also affect seal performance is an important factor, the more smooth friction surface friction coefficient is smaller, the performance will be good seals, the longer the life, on the contrary the more rough friction surface generated coefficient of friction the more big, seal life is very short.
4, lip seals but also by the impact of media, so consider what material seals must first take into account the problem of the media, the only way to ensure the correct use of environmental seals.
5, seals used in environments also take into account the temperature range of uses different materials to withstand the temperature of the seal are different, with high temperature and low temperature resistant. Correct choice of the degree of temperature sealing material is also an important part of the sealing material selection.