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


8" and Larger Globe Valve Not Allowed in Spec

8" and Larger Globe Valve Not Allowed in Spec

8" and Larger Globe Valve Not Allowed in Spec

Hi All,

I have a piping spec that does not allow 8" or larger globe valves and insists on a v-ball or gate valves as an alternative. I'm not sure the reason for this and am wondering if anyone has any insight? Below are the spec conditions:

Flange rating: 600# (max pressure: 10,210 kPag @ 38 deg C)
Code: ASME B31.3
Temp range: -45 deg C to 260 deg C
Service: Low temp sour process (NACE)
Corrosion Allowance: 3.0 mm


RE: 8" and Larger Globe Valve Not Allowed in Spec

You need to do some real research on this issue.
This includes an actual quote from a Valve supplier.
Class 600 10" Globe Valve with all your other data vs. a "V"Ball or other valve fit for your service and duty.

Sometimes its possible to do all the right things and still get bad results

RE: 8" and Larger Globe Valve Not Allowed in Spec

Experience with large disks has not been positive. It is hard to keep a very large disk flat in throttle service, it is nearly impossible to successfully lap in the seating surfaces, and it is common for the disks to slip out of alignment with the seat.

A V-ball has none of these issues and are very stable in larger diameters.

A gate valve is not a throttling device and that advice from the standard should not be followed.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

RE: 8" and Larger Globe Valve Not Allowed in Spec

My understanding is that it was difficult to manually operate large global valve which was not justified for the valve cost. Sometimes in the larger bypass valve of the control valve station, the gate valve might be used and intended for a temporary operation as the accurate modulation was not necessary.

RE: 8" and Larger Globe Valve Not Allowed in Spec

Awesome, thanks guys

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!


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