The shaft hole sealing ring used in the freight elevator cylinder adopts UN type polyurethane oil seal. U-shaped ring is a commonly used oil seal in hydraulic cylinders and is a typical lip seal. It can obtain good sealing performance whether it is used for pistons or piston rods. In the case of low pressure, the U-shaped ring in the freight elevator only relies on the interference deformation of the lip to produce a seal. As the pressure increases, the elastic deformation of the lip increases, and the tension, compression and bending pressure increase, and the U-shaped ring diameter The pressure is automatically increased, and the length of contact with the sealing surface continues to increase. Knowing that the entire axial length of the U-shaped ring is in contact with the sealing surface, it ensures good sealing performance under high pressure. The UN ring used in the freight elevator is universal for the hole and shaft. Its shape is symmetrical with the lips on both sides, and it can withstand the working pressure of 21MPa to 35MPa. Product use: used to seal piston rods in reciprocating hydraulic cylinders. Range of use: TPU general hydraulic cylinders, general equipment hydraulic cylinders CPU, imported engineering machinery, automatic hydraulic equipment, material: polyurethane TPU/CPU, product hardness: TPU HS90±2°A CPU HS95±2°A Working pressure: ≤45MPa Working temperature: TPU: -40°C to 80°C CPU: -40°C to 120°C Working medium: hydraulic oil
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