Guminių žiedų tepalai

Guminių O-ring žiedų tepalai          

O-ring guminių žiedų tepimas

Guminių oringų tepimas

O-rings are the most commonly used seals in fluid-power systems. However, elastomeric O-rings are unlike most of the materials that engineers and designers encounter. The reason: O-rings must deform to function properly.

As the name implies, O-rings are shaped like a donut. They are installed in cavities known as glands and then compressed. The resulting zero clearance within the gland provides the seal that blocks the flow of liquids and gases. This simple arrangement serves many fluid-power systems very well, but success still requires careful design, selection, and installation procedures.

O-rings typically fail in their applications because of the combined adverse effects of several environmental factors. Experience has shown the most common causes of O-ring failure are:

• * improper gland design &emdash; allowing for too much or too little compression, not enough room for displacement under compression, or tolerance stack-up

• * incorrect O-ring size

  * incompatibility between the O-ring elastomer and environmental elements it must contact

  * improper O-ring installation, and

  * inadequate O-ring lubrication.

The combination of stresses that act on O-rings can be complex and difficult to evaluate. Therefore, it is very important that both the O-ring compound and size be tested in the real environment of its service. The following examples picture and classify the common types of O-ring failure that can occur.