Meaning of Register fit for Mechanical Seals

[extremechanical]

Hello , Could any one explain me the term " Register fit", especially in the context of Mechanical seals.

 

[ClicketyClack]

I assume it refers to gland concentricity with the shaft. But you know what they say about assumptions.

 

[extremechanical]

Thank you ClicketyClack, So the word "Register " is what !!? so we "register" it somewhere?!! ...sorry for ignorant question ....

 

[1gibson]

Yes, the seal will have a small male step on the mounting face with a tight tolerance on the OD of that step: -----________------

It will mount to the pump or seal chamber which has a slightly larger ID:..................................................... ------|,,,,,,,,,,,,,,,,,|--------

To locate the seal as close to the pump/shaft centerline as required.


The register is where the o-ring is for a corner seal, or just inside of the o-ring if it is a face seal.

 

[extremechanical]

Gibson, Thanks a lot, but I did not follow. Can you comment on the sketch enclosed?

 

[1gibson]

So take a disposable coffee cup. The lid has a tight fit to the rim of the cup on that diameter (a little bit of an interference fit, but ignore that for now.)

The lid is the female component (interface on its ID) and the cup is the male component (interface on its OD.)

Lid is analogous to the seal chamber, rim of the cup is analogous that short step on the bottom of the mechanical seal.

 

[extremechanical]

Gibson, Understood. Thanks a lot for giving a good example.

 

[flexibox]

For the gland plate you can apply e8 H8 tolerance to achieve a spigot fit (registered fit)

Check this and you will see the numbers.

E8H8 is found in a limits and fits book!


Good luck.