Application 1 Face to face is according to JIS B2002 2 Flange drilled is according to JIS B2012 Test Working pressure 10K Shell pressure 2.1Kgf/ cm2 Seat pressure 15.0Kgf/ cm2 Main Parts and Materials Number Part Name Material 1 Body Cast Iron( GG25) Cast Iron( GG25) 2 Bonnet Cast Iron( GG20) Cast Iron( GG20) 3 Disc Ductile Iron( GGG40) Ductile Iron( GGG40) 4 Seat Stainless Steel( X5CrNi189) Stainless Steel( X5CrNi189)