Customized AS-C248 Double Cartridge Mechanical Seal

Background Knowledge：

How are vacuum devices sealed by mechanical seals?

There are two cases for the sealing of vacuum devices. One is that the mechanical seal separates a container filled with liquid medium from the external vacuum space. In this case, the main function of the mechanical  seal is to prevent the liquid medium from leaking into the vacuum space. Another situation is that the mechanical seal separates the vacuum inner cavity from the outer cavity, and its function is to maintain the required vacuum degree. This situation is more complicated, because even a slight leakage of the surrounding gas medium into the vacuum chamber will reduce its vacuum degree. Vacuum equipment may be damaged if corrosive gas leaks in.In many cases, the degree of vacuum and the cleanliness of the vacuum space have a decisive influence on the quality of various processes carried out under vacuum conditions.

Mechanical seals used in vacuum devices are not structurally special. For the first case mentioned above, a metal bellows type & single mechanical seal with good air tightness is usually used. In the second case, a double mechanical seal is used.