What can cause damage to polyurethane seals

In the usual work, the factory will use polyurethane seals to carry out the usual sealing work. In addition, since the design of each part of the sealing device is very reasonable, simply increasing the pressure will not cause damage to the rod seal. So, what conditions can cause rod seal damage, this article will tell you through the following snippets.

The rubber used in the manufacture of seals relaxes compressive stress under compression. At the same time, the compressive stress will decrease with the increase of time, and when the use time is too long, the compressive stress of the rubber will reach a large value, so that the elasticity of the seal is insufficient and the sealing ability is lost. Therefore, if conditions permit, trying to reduce the compression rate can effectively improve the sealing performance of the seal.

In addition, the sealed parts have the phenomenon of poor geometric accuracy, expansion of the inner diameter under high pressure, etc., which will cause the expansion of the sealing gap and the aggravation of the gap extrusion phenomenon. At the same time, the hardness of the seal will become smaller, so that the gap extrusion phenomenon of the seal ring is more serious. At this time, the hardness of the seal and the sealing gap can be strictly controlled, and the sealing material with suitable hardness can be selected to control the gap.

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