The classification of U-shaped sealing rings: U-shaped sealing rings for shafts, U-shaped sealing rings for holes, U-shaped sealing rings for holes and shafts, U-shaped sealing rings are a type of sealing ring that plays a sealing role. Because its cross-section is U-shaped, it is called a U-ring seal, also known as U-ring in English. U-shaped ring is a commonly used sealing element in hydraulic cylinders. It is a typical lip sealing element that can achieve good sealing effect whether used for pistons or piston rods. Under low pressure, U-shaped sealing rings only rely on the interference deformation of the lips to produce sealing. Due to the small contact area, the friction force is relatively low. As the pressure increases, the elastic deformation of the lips increases, and the tensile, compressive, and bending stresses increase. The radial compression force of the U-shaped sealing ring automatically increases, and the length of contact with the sealing surface continuously increases until the entire axial length of the U-shaped sealing ring contacts the sealing surface, ensuring good sealing performance under high pressure.