Large T-Pattern Globe Valves

[durgaprasad79]

Hi All,

I am keen to understand the largest T-Pattern Globe Valve that can be manufactured/in operation. Of course, I acknowledge designing Large Globe valves in system (using software) is not an issue. In really the Thrust of such large Globe Valves, especially beyond sizes like 20" in T-Pattern, are enormous. In conventional mode of operation i.e., line medium flows below disc, the problem in selecting stem material for such high thrust arises. Even if flow above the disc is accepted, based on exception by client, still I would like to understand the largest Globe Valve that this forum members would have come across with the varied experience you have.

Thanks in advance.

 

[gerhardl]

Try google! Velan (and probably others) have T globe steam valves up to at least DN600 (24 inches).

 

[durgaprasad79]

Hi Gerhardl,

Thanks for your suggestion. I very much did such search from Google. Though they have them on their websites or catalogs, the question here is "have those entire range ever been manufactured". There are instances were OEM's have designs for such sizes by would never have orders to such large sizes.

It is for this reason, I posted on this forum, to understand the largest that has been cited in operation.

I have RFQ's of Globe Valves that are of size 36" & 40" in #300 & #600 ratings. My factory is strongly against even attempting those sizes since "such sizes cannot be manufactured" !

Now with above background, it be interesting to understand the detail from members in this forum.

 

[gerhardl]

I have no experience myself of globe valves in theese dimension. I see no reason why they cannot be produced, though.

But the reason they are not produced, or seldom produced, is the extreme fabrication requiremnts: large dimensions, heavy weights, need of extreme sizes of metal-working machinery and lifting and mounting devices etc. Newer, lighter, cheaper and better valve constructions are available today. For a company to start production of larger sizes of globevalves, not having done this before, the cost would be high.

I doubt the modern market is very much in need of this valvetype today.

Where do you see the (competitive) need for larger sizes?