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Factors affecting the seal

Update:22 Jan 2018

The hydraulic seal plays a vital role in the integratio […]

The hydraulic seal plays a vital role in the integration of hydraulics and pneumatics. If a hydraulic pneumatic element seals the product, it will not be a good product. There are many factors affecting the seal. First of all, pressure is an important reason that affects the seal quality. The pressure level and the change of pressure cycle period 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 the seal, such as temperature, speed, seal material, clearance between piston and cylinder, and clearance between piston and cylinder head. Another is temperature and friction. It is difficult to describe the maximum and minimum service temperature of a sealing material, because this is the result of a series of factors. The working temperature of the piston and the piston rod is different, and it is necessary to make a difference choice between them. Another is the surface roughness, surface characteristics, pressure, medium, temperature, seal material, seal type and speed, all of which are the factors that affect seals. The last one is surface treatment, and the experience shows that the characteristics of the cylinder piston and the piston rod have a great influence on the life of the seal. The surface characteristics are usually defined by the value of the surface roughness RA, and the RA is the arithmetic mean of the surface shape deviating from the absolute value of the center line. However, these values do not fully represent the effect of surface conditions on seals. This is because even under the same roughness, different surface shape characteristics can lead to different degrees of seal wear on seals.