There are five general body styles of ball Valves: single body, three-piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve-especially the casing that contains the ball itself-are manufactured and assembled. The valve operation is the same in each case. Stainless Steel Ball Valves, Brass Ball Valves, Sanitary Ball Valves, Water Ball Valves ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsir-valves.com
In addition, there are different styles related to the bore of the ball mechanism itself.
Ball valves in sizes up to 2 inch generally come in single piece, two or three piece designs. One piece ball valves are almost always reduced bore, are relatively inexpensive and generally are throw-away. Two piece ball valves are generally slightly reduced (or standard) bore, they can be either throw-away or repairable. The 3 piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packings, polishing out of small scratches on the ball, all this without removing the pipes from the valve body. The design concept of a three piece valve is for it to be repairable.
95% of high-end machine tool numerical control systems in China still rely on imports
Abstract “At present, domestic high-end CNC systems and functional components mainly rely on imports.†Wang Liming, executive vice president of China Machine Tool Industry Association, pointed out that the domestic self-sufficiency rate of high-end systems is less than 5%, and about 95% depends on imports, including from Japan. ..
“At present, domestic high-end CNC systems and functional components mainly rely on imports.†Wang Liming, executive vice president of China Machine Tool Industry Association, pointed out that the domestic high-end system self-sufficiency rate is less than 5%, about 95% rely on imports, of which, the most imported from Japan. About 1/3 of the total, domestically produced high-end CNC systems add up to less than 20%.
In the international market, the medium and high-end CNC systems are mainly monopolized by a small number of enterprises represented by Japan FANUC Corporation and Siemens AG of Germany, of which Fanuc is about half. In the domestic market, there are more than 20 major-scale production enterprises, represented by five companies including Huazhong CNC, Guangzhou CNC, Dalian Dasen, Beijing Kai Endi and Nanjing Huaxing.
At present, China's domestic machine tools only have a numerical control rate of 30%, which is far from the level of 60% to 70% in developed countries. The numerical control rate of stock machine tools is only about 10%.
"In the industry's overall high-speed growth, China's machine tool industry is still a hidden worry." Tianxiang investment analyst Zhang Lei believes that from the perspective of product structure, the growth of the machine tool industry is mainly driven by low-end ordinary machine tools, high-end machine tools The proportion is decreasing and the heavy machine tool market is slowing down. Therefore, the current development path of the industry is not healthy.
Since 2011, orders from China's machine tool enterprises have grown rapidly, and products are in short supply. According to the survey of some key enterprises, as of the end of March, the company's orders in hand reached 30.91 billion yuan, an increase of 36.3%. Although the market situation continues to improve and orders continue to increase, companies generally report that delayed delivery has once again become the norm in the industry, and the tight supply of functional components is the focus of this contradiction. It has become a prominent contradiction in current production.