China Dredge Gravel Pump suppliers Our History Hebei Delin Machinery Co.,Ltd. is one of the biggest pump companies specialized in manufacturing slurry pumps in China. It covers an areas of more than 40,000m2 in land and over 22,000 m2 in building. The products are mainly used for river course, mining, metallurgical, city planning, power, coal, FGD, petroleum, chemical, building material,etc....