Lip seal is a self-sealing ring, it relies on the lip and close to the surface of the sealing coupling, obstructing the leakage channel to obtain the sealing effect. The working pressure of the lip seal is the sum of the pre-pressing force and the fluid pressure. When the pressure of the sealing medium is increased, the lip is distracted and more closely fit with the sealing surface, so that the sealing performance be enhanced further. In addition, the lip edge also has the scraping oil function which also enhance the sealing performance of the seal.
Custom Silicone Rubber Lip Seal
Rubber lip seal can be called as Rubber plunger seal, Rubber O-ring,Rubber gasket. It is a self-sealing ring, it relies on the lip and close to the surface of the sealing coupling, obstructing the leakage channel to obtain the sealing effect. The working pressure of the lip seal is the sum of the pre-pressing force and the fluid pressure. When the pressure of the sealing medium is increased, the lip is distracted and more closely fit with the sealing surface, so that the sealing performance be enhanced further. In addition, the lip edge also has the scraping oil function which also enhance the sealing performance of the seal.
Lip seal pressure changes with the media pressure changes,it always adapt to media pressure change when work,which can guarantee adequate sealing pressure, but not produce too much friction.
Extrusion seals, like O-ring,mainly produce sealing force by pre-compression force, the seal ring contact pressure given in advance, it can not be changed according to the media pressure changes during work. If required to seal a large pressure then the pre-pressure must also be great, while the large pre-pressure will increase the contact stress and contact area of the seal ring and sealing surface, which results in a great frictional resistance. Too much friction will cause damage to the seal, difficulty in starting up at low pressures or creeping. The lip seal opening and deformation can compensate for the small amount of wear, so as to ensure the sealing effect and the sealing life. The O-ring directly affects the sealing performance as the friction margin decreases.
In addition, the o-ring are easy to cause rolling and twisting in reciprocating seal, however,the lip seal is not obvious.
Compare with O-ring,the main disadvantage of lip seals is that they can only be used as a one-way seal. Two seals are required if used as a two-way seal, which increases the seal length.The grooves are difficult to design, Moreover, oil trapped between the two seals will cause oil pressure and back-pressure damage. However, the cross-sectional shape of the pre-compression type seal ring is symmetrical and can be used as a bidirectional seal with small volume and easy groove design.
Based on the above comparison, with a small amount of leakage allowed,the extrusion seal can reduce the groove size, but when require high seal performance, it choose the comprehensive performance lip seal.
| Description | Y-shaped seal(Lip Seal) | O-ring seal(Extrusion Seal) |
| Advantage | Seal section size is small, the installation groove can be designed as a monolithic groove; groove processing, seal installation easy,can be used as two-way seal (dual pressure) | Excellent seal performance; Low friction at low pressure; Automatically compensate after small amount of wear. |
| Disadvantage | Poor sealing performance; Easy to roll and twist, causing damage easily; The lower friction margin,the poorer sealing performance | One-way seal; Complex sealing structure,large size; Cause oil pressure between two seals; |
| Main application | Small size slide valve; Piston and rod seals which allow a small amount leakage | Piston and rod seals which require high seal performance. |
The typical shapes of the lip seal are divided into Y-shaped seal, V-shaped seal, U-shaped seal, L-shaped seal, J-shaped seal and others lip seal.
Xiamen Juguangli Import and Export Co., Ltd, who making Rubber Compression / plastic injection /Liquid Silicone Rubber Injection mold tool and producing silicone rubber compression parts, plastic injection parts,Liquid silicone rubber injection parts.
We are specialized on producing various silicone rubber lip seal , rubber O-ring according to customer's design drawing, which can meet differet requirements.
We have in-depth knowledge of mold-making technolog.Therefore we will control the minimized parting line and most exact dimensions for your products.
Our Advantages:
1. Own Precision Silicone Rubber Compression Mold-making Technology
2. Precision Silicone Rubber Compression, like for Smart Cellphone Parts, Medical Parts. (precision silicone rubber compression parts size tolerance can up to +/-0.01mm)
3. Liquid silicone rubber injection mold and production.