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Globe Valve For Isolation
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(Petroleum)
(OP)
20 Jun 11 19:29So 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.
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If you want to learn more, please visit our website ANSI Bellows Seal Globe Valve.
(Mechanical)
21 Jun 11 16:27Preliminary (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..)
(Mechanical)
21 Jun 11 23:51I 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
(Chemical)
22 Jun 11 10:32It depends on whether it's soft-seated or not.
(Petroleum)
27 Jun 11 23:09As 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.
(Mechanical)
29 Jun 11 12:27Again, 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.
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Metal bellows are used in globe valves to seal the plug stem to the atmosphere. The thin-walled corrugated cylinders are used as dynamic seals, particularly in applications where strict emission requirements apply. Metal bellows by SAMSON are made of corrosion-resistant materials. They are capable of withstanding high pressures and temperatures, which makes them ideally suited for use in high-performance service.
SAMSON's founding father, Mr. Hermann Sandvoss, had the metal bellows patented back in . And valves fitted with metal bellows still continue to be the prime choice for challenging applications. This statement is backed up by the impressive sales figures: 20 % of all valves sold are equipped with metal bellows.
For more information, please visit DIN Y Type Strainer.