dear sir,
i think ,to adjust hexagonal nut face of it as it forged there is chances of nut get tightened in tapered ,which makes uneven stresses at tightening.
regards
On Thu, Aug 29, 2013 at 8:03 PM, Vrajesh <vrajeshmail@gmail.com> wrote:
The nut area has been machined, may be to meet the dimensions requirements as per specs. Yes, the surface finish is not good. Valve suppliers use old castings some times to meet urgent requirements. Only the quality (QC) person attended stage inspection during manufacturing can say more about such thing.
Regards,
Vrajesh
Sent from my iPhone
On Aug 29, 2013, at 5:15 PM, Ezat Adel <ezatadel2008@gmail.com> wrote:
> Dear Expert,
>
> could you please see attached image for 4'',check valve,A216 WCB
> received as a new valve i have a doubt about the nuts area marking, if
> it's can occur during casting process or this valves used before.
> also the surface finishing in bad condition.
> i am waiting your advice asap.
>
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