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. Ball Valves Stainless Steel Ball Valves, Brass Ball Valves, Sanitary Ball Valves, Water Ball Valves ZHEJIANG KINGSIR VALVE CO., LTD. , http://www.cn-kingsir.com
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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.
Global Venezuelan missed the need to wait another hundred years for diesel generators on June 6 in many places around the world. | Diesel Generator Prices / 2012-06-04
Nanjing, June 4 (Mr. Somerset) The year of the Venus, which is worth looking forward to in 2012, will be staged on June 6th. On the 3rd, Wang Sichao, a researcher at the Purple Mountain Observatory of the Chinese Academy of Sciences, introduced that the transit of Venus in the world is frequent. The ground is visible, and the next time you see it again you will need to wait until 2117.
According to Wang Sichao, a researcher at the Purple Mountain Observatory of the Chinese Academy of Sciences, the Lingyue can be visited in Europe (except southwest polar regions), eastern Africa, Asia, Indian Ocean, Oceania, Pacific Ocean, Arctic Ocean, North America, northwestern South America, and northwest Atlantic. see. From the "Ling Shi" to the "Ling End" process in central and eastern China, from the 6:09:41 time on the 6th Beijing time, "Ling Shi" (Venus just came into contact with the sun) to 12:49:31 "Last End" (Venus completely out of the sun), the entire process will continue for more than 6 hours. In the western part of China, the sun can be seen radiating.
The so-called transit of Venus means that Venus runs between the sun and the earth, and the three are in a straight line. If the weather is fine, then the public will see a "small black dragonfly" slowly across the sun's face.
The rules for the emergence of "Venus transit day" are generally divided into two groups: 8 years, 121.5 years, 8 years and 105 years. Generally speaking, there are only four occurrences every 243 years or so.
Wang Shichao reminded that it is necessary to pay attention to the protection of the eyes to use filters, and must not wear ordinary sunglasses to observe directly, so as to avoid permanent damage to the eyes. (Finish)
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