High Temperature rated damper

[prmmel]

I need to build or purchase a small high temperature rated damper or valve for bypassing a low flow around a heat exchanger. A 4" valve orfice is adequate. I found several companies that can supply valves for close to $10k. Anyone have a lead on a supplier that would have a reasonably priced valve? Leak tight is not important and temperature will be 1800F.

Thanks,

Mel

 

[berkshire]

prmmel
A company I used to buy small high temp dampers from , was the, Fly Ash Arrester Corp. They have been taken over, here is a link to their successor corp, however they may not make anything that small any more.

http://www.clarage.com/clarage/pdfs/CLBUcustom.pdf

B.E.

 

[RossABQ]

I would guess in this size range a butterfly type damper is most cost effective. Several companies make them for high-temp service, with ceramic-like or graphite bearings/seals.