Marine Cast Steel Screw Down Check Angle Valve also can be called as Marine Cast Steel Angle SDNR Valve or SDNR Angle Valve. It is suitable for the pipe system with the medium fresh water, air & other gas, oil and steam with the temperature not over 300 centigrade degree. Design Standard: JIS F7471-1996 Test Standard: JIS 7400-1996 Hydraulic Test Pressure: Body-2.1Mpa, Seat-1.54Mpa Flange size as per JIS B2220 -10K Main Material: 1-Body:Cast Steel (SC480) 2-Seat: Bronze (BC6) or Stainless Steel (2Cr13, SCS2) 3-Disc: Bronze (BC6) or Stainless Steel (2Cr13, SCS2) 4-Stem: C3771BD (Brass) or SUS403 5-Bonnet: Cast Steel (SC480) 6-Handwheel: Cast Iron (FC200) 7-Packing Gland: Bronze (BC6) or Stainless Steel (2Cr13)