SUBJECT: The sealing of high pressure and hard vacuum 5-7

High pressure sealing problems

High pressure does three things that will damage any mechanical seal :

The excessive hydraulic pressure can come from several sources that include:

The solution to high pressure sealing falls into three separate categories. You must decide which of the approaches makes the best sense in any given application. The three approaches you can use are:

Normal vacuum sealing

Vacuum means less than atmospheric pressure and vacuum sealing falls into two categories:

Normal vacuum. This vacuum is usually measured in inches or millimeters of mercury.

Hard vacuum sealing. This vacuum is normally measured in microns, micro-inches, or portions of a millimeter of mercury (Torr).

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