Globe Valve For Isolation

[daltonfury]

So the question is, does a globe valve have the same sealing properties as a gate valve as an isolation. If not are there any gate valves with the same flange to flange dimensions as a full swing check? Thanks for the help.

 

[gerhardl]

Preliminary (unqualified)answers:
Sentence one: yes (under certain circumstances/conditions)
Sentence two (if no to sentence one): yes (under certain circumstances/conditions)

Full information is necessary if you wish a more detailed answer.Please specify all details (size, pressure class, media, working pressure etc, etc, etc..)

 

[zdas04]

I think it depends. If you EVER use the globe valve for throttling, then it is difficult to get it to seal in on/off service. If you NEVER use the globe valve for throttling, then it should give you a positive shut off a couple of times, maybe.

I don't use an on/off valve (gate, ball, or butterfly) for throttling and I don't use a throttle valve (globe, v-ball, or choke) for on/off service.

As to fitting in the hole of a swing check, look up flange to flange dimensions in API 6D.

David

 

[moltenmetal]

It depends on whether it's soft-seated or not.

 

[stiffler]

As Gerhardl says, it's impossible to say for sure until all service information is assessed but I see no reason why a globe valve wouldn't work as a shut-off. it's not ideal but if the urgent situation required it, it could be done.

To improve positive seating, the valve can be installed in reversed orientation to provide a force down onto the plug instead of trying to push it off the seat.

You would of course lose a great deal of flow capacity through a globe valve compared to a gate....and they usually cost more.

Zdas04 is assuming that you are referring to ANSI standard valves, whatever class of valves you have, there should be commonality between the face to face dimensions...but it would pay to check.

 

[bcd]

Again, as Gerhardl said, it depends upon the service. Small bellow sealed globe valves are used for on/off service everyday in pretty challenging sealing situations such as Hydrogen.