The average is about 654.38+0 billion. The sales revenue of "North Valve" is increasing year by year, and now it has exceeded 654.38+0 billion yuan. "Beijing" brand products of "North Valve" are sold all over the world, and are widely used in petroleum, natural gas, chemical industry, electric power, metallurgy, national defense science and technology, mines, ships, food, medicine, water supply, heating and ventilation, urban construction and other important fields.