Flange valve Standard or Nonstandard: Standard Structure: Butterfly Material: Casting Pressure: Medium Pressure Flange valve1) Materials: gray iron, ductile iron, carbon steel, stainless steel, alloy steel and aluminum2) Standards: ASTM, JIS, BS, DIN, EN, ISO3) Operation: green sand casting and resin sand casting4) Surface finishes: sand blasting, oiled, zinc, nickel, chrome plating, painting, ...