Seals maintain good sealing performance throughout their lifespan, while also having low friction and wear, and are expected to perform well even in harsh working environments. In order to meet the different requirements of the above aspects, we should choose seals more reasonably. Due to many factors that can affect the selection of seals, it is necessary to understand the application environment of the oil cylinder and analyze its performance requirements before making a choice.

When choosing seals, it is important to consider the following important factors:

pressure

The level of pressure and the length of the pressure cycle have a significant impact on seal damage (such as extrusion). The higher the pressure, the greater the impact of other factors on the performance of the seal, such as temperature, speed, seal material, clearance between the piston and cylinder, and clearance between the piston and cylinder head.

temperature

It is difficult to describe the maximum and minimum operating temperatures of a sealing material, as they are the result of a combination of factors. The working temperatures of the piston and piston rod are different, and they need to be selected differently.

friction

The friction between the seal and the sealing surface depends on many factors: surface roughness, surface characteristics, pressure, medium, temperature, material of the seal, type and speed of movement of the seal.

surface treatment

Experience has shown that the characteristics of the cylinder piston and piston rod surface have a significant impact on the lifespan of seals. Surface characteristics are commonly defined by the value of surface roughness Ra, which is the arithmetic mean of the absolute deviation of the surface shape from the centerline. But these values cannot fully represent the impact of surface conditions on seals, because even under the same roughness, different surface shape features can lead to varying degrees of seal wear.