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https://www.hebeileading.com/valves-applications-in-mining.html

Valves are used extensively in the mining industry, such as knife gate valves, off-set butterfly valves, flanged check valves and metal-seated ball valves. For the mining industry, the medium usually has characteristics of large particles, high hardness, high viscosity, strong acid, and strong alkali, etc., so when selecting the valve, the mining valves should be wear-resistant, corrosion-resistant, and excellent in circulation performance.