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
[A] low temperature tempering (150-250 degrees)
The structure obtained at low temperature tempering is tempered martensite. The purpose is to reduce the quenching internal stress and brittleness so as to avoid cracking or premature damage during use, while maintaining the high hardness and high wear resistance of the hardened steel. It is mainly used for all kinds of high-carbon cutting Tools, measuring tools, GB/T9711.1 pipeline steel tubes, rolling bearings and carburizing parts. The hardness after tempering is generally HRC58-64.
ã€Second】Tempering at medium temperature (250-500 degrees)
The tempered troostite was obtained by tempering at medium temperature. Its purpose is to obtain high yield strength, elastic limit and higher toughness. Therefore, it is mainly used for the treatment of various GB/T9711.1 pipeline steel pipes and hot work molds. The hardness after tempering is generally HRC35-50.
[three] high temperature tempering (500-650 degrees)
The structure obtained by high temperature tempering is tempered sorbite. The heat treatment combined with quenching plus high temperature tempering is customarily called quenching and tempering. Its purpose is to obtain comprehensive mechanical properties with good strength, hardness, plasticity and toughness. Therefore, it is widely used in automobile, GB/T9711.1 pipeline steel, machine tools and other important structural parts, such as connecting rods, bolts, gears and shafts. The hardness after tempering is generally HB200-330.
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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.
The type of L245N seamless steel pipe tempering According to the different performance requirements of GB/T9711-2011 line pipe, according to the different tempering temperature, tempering can be divided into the following categories: