Seals have good sealing performance in their life cycle, but also have low friction and wear, and hope to have good performance in harsh working environment. In order to meet the different requirements of the above aspects, we should choose seals more reasonably. Because many factors will affect the choice of seals, it is necessary to understand the application environment of the cylinder when choosing seals, and make a choice after analyzing and researching its performance requirements.

When choosing seals, we should consider the following important factors:

pressure

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

temperature

It is difficult to describe the maximum and minimum operating temperatures of a sealing material, because it is the result of a series of factors. The working temperatures of piston and piston rod are different, so they should be chosen differently.

Friction

Friction between seals and sealing surfaces depends on many factors: surface roughness, surface characteristics, pressure, medium, temperature, material of seals, type and speed of seals.

surface treatment

Experience shows that the surface characteristics of cylinder piston and piston rod have a great influence on the life of sealing parts. Surface properties are usually defined by the value of surface roughness Ra, which is the arithmetic mean of the absolute value of the surface shape deviating from the center line. However, these values can not fully express the effect of surface conditions on seals, because even under the same roughness, different surface shape characteristics can lead to different degrees of wear and tear of seals.