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Hi all!!! Can anybody tell me wh

Hi all!!! Can anybody tell me wh

Hi all!!! Can anybody tell me wh

(OP)
Hi all!!!

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

Thanks.

RE: Hi all!!! Can anybody tell me wh

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.  

RE: Hi all!!! Can anybody tell me wh

(OP)
Thanks so much JimCasey.
Cheers.

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