U-ring is the most commonly used hydraulic cylinder seals, is a typical lip seal, regardless of the piston or rod can be used to obtain a good sealing performance.

     U-rings at low pressure situations, rely on the lip seal interference deformation, as the pressure increases, the lip elastic deformation increases, tensile, compressive and bending stress increases, U-ring radial pressure automatically become larger the length of contact with the sealing surface of the U-ring increased until the entire axial length of the contact with the sealing surface, so as to ensure a good seal under high pressure.

     UN is a common bore axis, its shape is symmetrical on both sides of the lip, capable of withstanding the operating pressure 21MPa ~ 35MPa, the temperature may be -35 ~ 100 ℃, made of M-90 material.