There are many materials for manufacturing valve parts, including ferrous non-ferrous metals of different brands their alloys, various non-metallic materials, etc. The material of valve parts manufactured by automobile casting factory should be selected according to the following factors: 1. Pressure, temperature characteristics of working medium. 2. The stress condition of the part its function in the valve structure. 3. It has better processability. 4. In the case of meeting the above conditions, the automobile casting processing should have a lower cost.

The material of valve body, valve cover valve plate (disc) the valve body, valve cover gate (disc) are one of the main parts of the valve, which directly bear the medium pressure, the materials used must meet the requirements of "pressure temperature rating of the valve".

Gray cast iron: gray cast iron is suitable for water, steam, air, gas, oil other media with a nominal pressure of PN ≤ 1.0MPa a temperature of 10 ℃ ~ 200 ℃. The common grades of gray cast iron are: HT200, HT250, HT300, ht350.