The classification of U-shaped rubber sealing rings: U-shaped rings for shafts, U-shaped rings for holes, and U-shaped rings for holes and shafts are a type of sealing ring that plays a sealing role. Because its cross-section is U-shaped, it is called a U-ring, also known as U-ring in English. U-shaped rubber sealing 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, the U-shaped ring only relies on the interference deformation of the lip to produce a seal. Due to the small contact area, the friction force is relatively low. As the pressure increases, the elastic deformation of the lip increases, and the tensile, compressive, and bending stresses increase. The radial compression force of the U-shaped ring automatically increases, and the length of contact with the sealing surface continuously increases until the entire axial length of the U-shaped ring contacts the sealing surface, thereby ensuring good sealing performance under high pressure.

Applicable working conditions: reciprocating motion

Working pressure: 0-40MPa

Reciprocating speed: ≤ 0.5m/s

Applicable temperature: -30 ℃~110 ℃

Applicable materials: PU, fabric NBR, etc

Specification and model of U-shaped rubber sealing ring

Nitrile rubber is formed by copolymerization with butadiene, with a content ranging from 18 to 50. The higher the content, NBR rubber is a rubber component suitable for fluid media such as hydraulic oil, especially sealing components.

Nitrile rubber is a common type of O-ring seal and is often used for sealing hydraulic and pneumatic systems. As a commonly used material for O-ring seals, what are the main performance characteristics of nitrile rubber?

Oil resistance: Nitrile rubber O-ring has excellent oil resistance, second only to polysulfide rubber and fluororubber, and has excellent wear resistance and airtightness; Its disadvantage is that it is not resistant to ozone, aromatic, halogenated hydrocarbons, ketones, and ester solvents, and is not suitable for use as insulation materials.

Heat resistance: Nitrile rubber has better heat resistance than butadiene styrene rubber and chloroprene rubber, and can work at high temperatures of 120 ℃, with air tightness second only to butyl rubber. The performance of nitrile rubber is affected by the content of acrylonitrile. As the content of acrylonitrile increases, the tensile strength, heat resistance, oil resistance, airtightness, and hardness of nitrile rubber increase, but the elasticity and cold resistance decrease.

Usage: Nitrile rubber O-ring is mainly used to make oil resistant products, such as oil resistant pipes, tapes, rubber diaphragms, and large oil pockets. It is commonly used to make various oil resistant molded products, oil seals, cups, diaphragms, valves, corrugated pipes, hoses, seals, foams, etc. It is also used to make rubber plates and wear-resistant parts.

The material of nitrile rubber O-ring is not just nitrile rubber, but the main material is nitrile rubber. Because each customer needs different properties such as wear resistance, hardness, and temperature resistance, they often mix and refine according to multiple formulas to obtain the final material.