S tube valves are cast into shape with austenitic manganese steel, the quick wearing surface is welded with wear-resistant material, has the dual advantages of anti-high pressure and anti-wearing.

• 管阀采用高锰钢整体铸造成型，易磨损面采用搞磨材料堆焊，具有耐高压与耐磨损双重优点；