Flanges are a method of connecting pipes, valves, pumps, and other equipment to form a piping system, usually by welding or threading. It is also easy to clean, inspect or modify. Flanges are usually welded or tightened. Flange joints are made by bolting two flanges together and using washers between them to provide a seal.
Pipe assemblies may be bolted together between flanges. Flanges are used to connect pipes to each other, to valves, to fittings, and to special items such as filters and pressure vessels. Cover plates can be connected to create "blind flanges". Flanges are bolted together, and sealing is usually done using washers or other methods. Industries dealing with flammable, volatile, toxic or corrosive substances require special protection at flange joints. Flange shields can provide an additional level of protection to ensure safety.
There are many different flange standards worldwide. For simple functionality and interchangeability, these designs have standardized dimensions. Common world standards include ASA/ASME (USA), PN/DIN (Europe), BS10 (UK/Australia) and JIS/KS (Japan/Korea).
In most cases, standards are interchangeable, as most local standards have been aligned with ISO standards.
Flanges are also made in standardized sizes, usually in "flat", "convex", "mortise" or "ring joint" styles, but other ambiguous styles may be available.
Flange designs include "weld neck", "socket", "lap", "socket weld", "thread" and "blind flange".
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China National Heavy Duty Truck Executive Director Tong Jingen said yesterday that in the first quarter of this year, the Group sold about 28,800 heavy trucks, a year-on-year decrease of about one percentage point. However, as the prices of iron materials, plastics and other raw materials fell, I believe that the gross profit margin is expected to be from last year’s The level of 14% rose. Wei Zhihai, vice president of the group, pointed out that as the state supports the merger and reorganization of the heavy-duty auto industry, the group will make full use of these opportunities, but there is no mention of merger and acquisition targets.
Tong Jingen said that in the first quarter of this year, the sales volume of the Group’s heavy trucks had a double-digit increase compared to the fourth quarter of last year, and he expects heavy-duty truck sales to exceed sales last year, with sales of about 100,000 vehicles last year. He said that the new products introduced this year include the HOWO-A7 tractor and technology upgrade 09 series.
Raw material price drop gross margin over 14%
In the export market, last year the group exported 15,643 heavy trucks, a decrease of 0.5% year-on-year. Tong Jingen said that in the future, it will vigorously expand its business in Central and South America and Africa. The main reason is that these regions are relatively less affected by the financial tsunami and have greater potential for future development.
View related topics: China National Heavy Duty Truck Breaks Monthly Sales Record for National Heavy Truck Industry