Material 
1    Body         Cast iron/ductile iron
2    Cover        Cast iron/ductile iron
3    Float ball    NBR
4    Spindle      Stainless steel/brass


Design
1   Design is according to ISO Standard
2   Flange drilled is according to DIN,BS,JIS,ANSI etc.
3   Thread is according to BS,DIN,JIS,ANSI standard etc.

Test
Working pressure  PN10/PN16     Class 125/150
Shell pressure       PN15/PN24       300PSI
Seat pressure       PN11/PN17.6    200PSI