Contact US

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

Valve type

Valve type

Valve type

Client specification calls for usage of Ball valve only for Actuated valves for ON-OFF service also for all sizes. Should there be any specific reason for this specification? Contractor proposes to use Butterfly valves.

Thanks to clarify

RE: Valve type

First, a client is always right and I think ball valves are more expensive but also safe and robust, a butterfly...might be cheaper but can also impede flow ie pressure drop so probably depends on what is in the pipe(mechanical abrasion, jamming).

RE: Valve type

It may be driven by the pipe spec which calls for a ball valve.
Often I see a plug valve as a substitute, I think they are less expensive to manufacture in larger sizes but may require a larger actuator.

RE: Valve type

Thanks for all your replies. Actually these valves are used for clean effluent water and it is not from the pipe spec but only in the Instrumentation spec.

I agree with UniCO2,that there will be significant cost variation between ball and butterfly valves but is it that the butterfly valves will be less reliable than ball valves in terms of failure of components?

The max upstream pressure of the subject valves is 4bar only.

RE: Valve type

You can see the cycles to failure on the spec sheet for the valve. I would think you can buy a very expensive butterfly that is better than a cheap ball valve and vice versa. Could be, when they do fail how they actually fail(open or closed). Lastly - the pressure drop with a different valve (butterfly) might affect all the other calculations for the system.

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


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