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In order to ensure the quality of the valve during production and processing, it is necessary to do its inspection work, so what is the specific operation?Because when it is used on the pipeline, its quality affects the sealing safety of the pipeline, so it is necessary to ensure its wall thickness,
Brass standard is a standard rule formulated by the relevant state departments to regulate the brass industry. It is of great significance for the harmonious, stable and unified development of the brass market.Brass is an alloy of copper and zinc. If brass is composed of copper and zinc, it is calle