Urban water supply with iron pneumatic valve material requirements

, urban water supply in all parts of the valve pneumatic, packing and seals shall be used for water pollution caused by the material. Among them, the rubber seal rubber should comply with the provisions of GB.
and gray cast iron parts shall comply with the provisions of GB. Ductile iron castings shall comply with the provisions of GB.
, factory when using a special coating to prevent corrosion, should not be polluted water.
, pneumatic valve stem application of chromium content should not be less than. % of the stainless steel manufacturing. Shall not use copper casting.
parts, pneumatic valve internal fixation fasteners are used in application of stainless steel.
, opening and closing indicator scale and rotation of Pointers, and application of corrosion resistant materials such as stainless steel manufacturing.
, urban water supply in other parts of pneumatic valve material selection should be according to the provisions of the JB/T.