×
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

Slurry Valve Tightness

Slurry Valve Tightness

Slurry Valve Tightness

(OP)
Hello all!

What's the best material combination (metal/metal, metal/polymer, ???/????) of materials to assure tightness in high pressure and high abrasive applications such as the valves in a positive displacement pump for bauxite slurry transport?

Thanks all!

RE: Slurry Valve Tightness

In general, for abrasion resistance you have two options: you can either try the hardness route or the energy-dissipating route (ie. elastomers). For high pressure stressed components such as check valves in PD pumps, the latter is usually pointless- you need hard materials: tungsten carbide, silicon carbide etc.

RE: Slurry Valve Tightness

I am a bit old school.

Another way to approach difficult applications, instead of stressing over the correct material/material combination, may be to go with 2 or more valves in series. If one valve won't hold, try 2 ... and so on.

Material selection and appropriateness is important. But, if in doubt ...

"Do not worry about your problems with mathematics, I assure you mine are far greater."   
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?

RE: Slurry Valve Tightness

Ashereng has a good point- you will need two discharge checks in series, and three might be in order.  But if one wears due to impingement of abrasive slurry, the other will too.  It's definitely a good idea to try to find the right material in the first place than to merely try standard parts and retrofit if they don't work.  

People pump similar slurries commercially on a daily basis, often against quite high pressures, and the good pump manufacturers do tend to learn what works and what doesn't.  Their distributors, on the other hand, can seldom be relied upon to provide this information.  And of course if you hard spec something, that's what you'll be offered, regardless how well it is likely to work.

RE: Slurry Valve Tightness

Try Delta knife gate valves. they promote zero leakage designs.

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au

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