×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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!
*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

best option for a ball valve seats

thread367-10729

best option for a ball valve seats

best option for a ball valve seats

(OP)
I would like to know the best scenarios to use Nylon and PTFE as ball valve seats.
I know the different temperature range of both of them but, what about corrosion?, are good enough to use them in ball valves installed in lines with oily water as fluid?.
Thanks for all of your collaboration and best regards,
Jorge

RE: best option for a ball valve seats

Nylon is usually used for Toluene, Benzene, etc... and Teflon can be used for almost anything except these.  It will rub away if the valve body is SS, so I would recommend using PP bodies on them.  Can you tell us alittle more specifics about this application and what you are looking to use the valve for?

RE: best option for a ball valve seats

(OP)
Hello pittguy727,
First of all, thank you for your answer.
The valve will be installed in a drainage line of a vessel at 650 psi.
This line comes from a separation vessel which separates water from oil. The composition of the water is:
Cations (mg/l):

Ca ++    14,428.8
Mg++      3,769.60
K+        1,100
Na+      21,550
Fe++        271.21
 
Anions (mg/l)
 
Cl-      73,573.28
SO42-       237.85
HCO3-        32.33

pH = 4.6

Chlorides  in NaCl = 121.395 g/l

About the body will be in a-105 but the trim will be in SS316. Do you agree with that configuration?. The next question is about the seats, Nylon or PTFE?

Thank you again for your collaboration

Jorge
 

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! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close