Pl. read catalogs for more understanding.
The subject of seating in double ot triple offset butterfly is litte bigger than other valves due to the emphasis given to the application and operating conditions.
There are quit a few proprietary seat designs. For eg. the graphite layers gets eroded in few weeks to months due to operating condition resulting in big leak and pressure drops. The profile of the seat and disc is also important which developes the cavitation effect and pitting of the seat. So in the selection of a seat the operating condition such as the opening angle, pressure, which in turn will affect the operating pressure in turn the system design itself. So a well thought process is essential in the butterfly valve type and seat selection.
In solid seat the cost makes the big difference.
Regards,
Kannan
--- In piping_valves@yahoogroups.com, "ashoksiva1982" <ashoksiva1982@> wrote:
>
> Dear all,
>
> I have an enquiry for Double offset butterfly with metal seat. The design pressure shall be 40 bar. Can any one know the seating arrangement of competitor valves.
>
> I got some information from the below link. I need some more arrangement for the above requirements.
>
> http://www.sz-yll.cn/upload/814/200631485558638680174.pdf
>
--- End forwarded message ---
