×
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

lug butterfly valve piping replacement

lug butterfly valve piping replacement

lug butterfly valve piping replacement

(OP)
Hey Guys,

I am currently working on a project where i need to replace entire piping with valves.

The configuration is as follows.

Blind flange>>Piping section>>Lug butterfly valve>>piping section>>Blind flange

Problem statement :
Since lug butterfly valves have single through bolts, while replacing these valves and installing new ones, i need to keep disturbing the adjacent piping section also beacause of the the through bolt.

Is there any idea to replace the valves without disturbing the adjacent section?
Your response will be highly useful.

RE: lug butterfly valve piping replacement

Consider a double flange BFV.

Per ISO, only the term Safety Valve is used regardless of application or design.

RE: lug butterfly valve piping replacement

Your butterfly valve type sounds like a "wafer" type valve with the bolt going through the bolting holes.
The correct "lug" type valve is that the valve can be unbolted either end independently. You may check with the valve vendor for the correct "lug" valve type or change it with the double flanged butterfly valve as suggested above.

RE: lug butterfly valve piping replacement

the problem exists only with WAFER type butterfly valves, which have to be installed inbetween flanges (like a gasket).
LUG type butterflies have through threaded holes (except the ones adjacent to the stem which are blind holed) which means you can bolt either end independently.

RE: lug butterfly valve piping replacement


1. Yes, there is always a solution.

2. It will help with a drawing and a bit more detailed description of 'lugs'

3. Reason: 'lugs' have been misused and used with different meanings from different factories throughout the world and, covers threaded lugs, open lugs for holding, a mixture of both types on the same valve, and others. This regardless all tries for standardization.

4. Most economical solution will be depending on exact details of all connected pieces, nominal sizes, pressure class and number of valves (plus of course all other engineering and flow details. Solution could be other types of piping/connection pieces/valves or special bolts and flanges.

Good luck

RE: lug butterfly valve piping replacement

Alfred Philips,
how long are the piping sections?

Some Manufacturers may supply double-flanged triple-offset valves with extended, even customized, face-to-face dimensions (usually intended to replace existing gate valves): perhaps they may replace your "Piping section>>Lug butterfly valve>>piping section" as a whole, or partially...?

Hope this helps,
'NGL

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

Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now
eBook - Managing the Context of Product Complexity Using the Digital Twin
Keeping track of changes to complex products is difficult—think Aerospace & Defense equipment, new generations of commercial aircraft, and software-based automobiles. A new way to managing the digital context of the physical product is required and the answer is the Digital Twin. This ebook explores the opportunity available for Operations and Maintenance for the Digital Twin. Download Now
White Paper - Trends in Industrial Filtration
Substantial progress has been made in filtration technologies in recent years. New filter media materials, designs and processes have led to filters that are more efficient, reliable, compact and longer lasting. This white paper will discuss the various trends that are impacting operational responsibilities of MROs today and the resources that are available for staying up-to-date on the latest filtration solutions. 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