Marine Ductile Iron Angle Check Valve JIS F7322C is made of ductile iron to replace the expensive bronze valve in some small size pipe system. Technical Specification: Design Standard: JIS F7322C-1996 Test Standard: JIS 7400-1996 Hydraulic Test Pressure: Body-1.05Mpa, Seat-0.77Mpa Flange Standard: JIS B2220 -5K Material: 1. Body/Bonnet---Ductile Iron FCD450 2. Seat---SUS (SCS2) /Bronze (BC6) 3. Stem---SUS (SCS2) /Brass (C3771BD)