Hi all!!! Can anybody tell me wh

[dembous]

Hi all!!!

Can anybody tell me which stantard deals with Relief Valves Connection (most importantly Facing)?

Thanks.

 

[JimCasey]

Relief valve flanges are just like piping flanges that they mate with so a likely governing reference would be B16.5.

Full Nozzle safety-relief valves WOULD have a thicker raised face than the nominal 1/16" RF on a standard ANSI flange.

Facing, or surface prep of the flange has more to do with the application: Use serrated flanges 125-250 Ra if you are using composite gaskets. If you intend to use Flexitallic-type (Spiral-wound) gaskets it is then appropriate to use smooth-faced flanges because the spiral-windings form a moire pattern on the serrations and it is more likely to get a leak.

 

[dembous]

Thanks so much JimCasey.
Cheers.