Since the introduction of domestic non-leakage sealing technology—mechanical seals—into industrial pumps, many Chinese pump manufacturers have adopted mechanical seals in the sealing sections of their pumps. However, the results have often been unsatisfactory, particularly in the coal washing industry, where pumps are frequently used to transport liquids containing a high concentration of solid particles. The harsh operating conditions can make mechanical seals less reliable than traditional packing seals. As a result, China's medium pump sealing technology has long lagged behind international standards, with the sealing performance still far behind imported pumps.
Driven by a sense of national responsibility, China University of Mining and Technology took the initiative to develop leak-free medium pumps. Drawing on advanced international sealing theories and years of practical experience, the university introduced a combined sealing system that integrates mechanical seals with auxiliary impeller seals. In 2002, it partnered with Shandong HSBC Machinery Group Corporation to develop a "drip-free" slurry pump and circulating water pump, marking a significant breakthrough in domestic leakage-free sealing technology.
Today, HSBC Group has expanded its product line based on this innovative sealing technology, offering a wide range of non-leakage slurry pumps and circulating water pumps. It is now the only medium pump manufacturer in China that has completely phased out packing seals, setting a new standard for reliability and performance in the industry. This achievement not only highlights the technological progress made by Chinese enterprises but also demonstrates the potential for domestic innovation to compete globally.
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