Working of the Mechanical Seal

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Working :

The mechanical seal works by using two very flat, overlapping faces of a stationary and rotating element, which makes leakage difficult to occur. When the two faces rub together, a fluid film is formed between the two faces, which migrates for cooling and lubrication purposes.

The pumped fluid will flow out between the two faces, enter as a liquid, and evaporate when it reaches the atmosphere. By avoiding fluid leaks and keeping pollutants out

Formation of a fluid film during rotation


Leakage points:

The most common mechanical seal has the following sealing points:

  • Gasket between the seal cover (gland plate) and stuffing box.
  • O-ring between the seal cover and stationary element (secondary seal).
  • O-ring between the rotating part (secondary seal)

The mating faces of both components (the stationary and rotating elements) are lapped to be extremely flat, creating the last sealing point (the primary seal).

Following Figure indicates the leakage points :

 



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