1. Chemical and spectral analysis
The use of chemical analysis to determine the content of various elements in the butterfly valve material is a long-standing method, and this method can be said to be very reliable based on long-term use. Spectral analysis refers to that the material of the butterfly valve emits spectrum under high temperature excitation, so the material of the butterfly valve can also be determined by spectral analysis.
2. Spark identification
When grinding metal materials, sparks are often generated due to violent friction. The identification of the material of the butterfly valve is based on this method. It is polished and the composition of the material is identified by distinguishing the characteristics of its sparks.
3. Section
The butterfly valve sample is cut, and the content of various elements in the valve material can be distinguished from the characteristics of the color and crystal grain on the section, but this method often requires people with experience in metal material manufacturing.
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