How to Find Valve Body Flange Thickness Without Using ASME B16.5

This question does not compute. Flanges on valves are not slip-on or socket-weld or threaded; those terms apply to flanges that attach to pipes. Why avoid ASME B16.5? Somebody asked this question recently, anyway.

thanks for replay Tornado,

yes your right,but my question is more concern about female socket of raised face flanges.

their is uncertain geometric reason to difficult to maintain thickness as per ASME B 16.5.

i don't see why it's difficult to maintain thickness. the B16.5 flanges has standard thickness, right?

Sounds like you have weld-end valves and want to attach a flange, or you are trying to match a specification. There are a number of flange specs available - those from U.S., Germany (DIN) and UK (BS or EN BS) as well as ISO.

Let the forum know a few details like pressure, temp, size (probably small if you are thinking of socket welds). Is it for an instrument valve?

The piping spec may determine the type of flange you need and define allowable codes.

If it is a bolt up flange we use the diameter of the bolt that MSS SP-81 calls out for your valve size. We have done it this way for 20 years.