×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

why softer face is rotary

why softer face is rotary

why softer face is rotary

(OP)
in a mechanical seal why a softer face is rotary

thx in advance

RE: why softer face is rotary

The softer face is not always the rotating face, but is almost always the spring loaded face. The softer face being the sprung member allows it to 'wear into' a harder surface, i.e. the harder stationary or non spring loaded face. In the optimum tribological scenario, we want two dissimilar materials with differing finishes and hardnesses so we maximize lubricity and upper PV limit capability.

Soft is a relative term, as even with hard seal face pairings there will be a hardness difference between the two. The exception is when you run like hard face materials against on another, which is not a common practice due to the huge drop off in PV limit capability.

RE: why softer face is rotary

Mostly, the soft seal is replaceable and the hard shaft is not.  It's kind of a "No-Brainer" choice.

RE: why softer face is rotary

(OP)
Dear sreid
if replacement is concept behind this then  softer face should be stationary as it is easy and economical to replace then spring loaded face
i am quite agree with  bk19702

thx

RE: why softer face is rotary

(OP)
Dear sreid
if replacement is concept behind this then  softer face should be stationary or non spring  as it is easy and economical to replace then spring loaded face
i am quite agree with  bk19702

thx

RE: why softer face is rotary

I answered too fast once again and didn't read the post correctly.  My "Vision" was a "rubber" shaft seal.  The shaft is hard and rotating and the seal is stationary and easily replaced.  It wears and the "Hardened" shaft does not.

So in the OP, what does "Mechanical Seal" mean exactly.

RE: why softer face is rotary

Probabaly worth while to read and understand the post fully before responding. Mechanical seal as stated in the OP (at least how I comprehended it, anyway) should be referring to contacting end-face seals and any variation of them.  

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources