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不同種類的管法蘭的特征及其適用范圍，管法蘭按與管子的連接方式可分為五種基本類型：平焊法蘭、對焊法蘭、螺紋法蘭、承插焊法蘭、松套法蘭。
The characteristics of different types of pipe flange and its applicable scope, according to connection and the pipe can be divided into five basic types: pipe flange, flange, flange, threaded flange, socket welding flange, loose flange.
1、焊鋼法蘭：適用于公稱壓力不超過2.5MPa的碳素鋼管道連接。平焊法蘭的密封面可以制成光滑式,凹凸式和榫槽式三種。多用于介質條件比較緩和的情況下，如低壓非凈化壓縮空氣、低壓循環水，它的優點是價格比較便宜。
1, welding steel flange: apply to nominal pressure not more than 2.5MPa carbon steel pipe connection. Flange sealing surface can be made smooth, bump and tenon slot three. More suitable for medium conditions, such as low pressure non purification compressed air, low pressure circulating water, it has the advantage of cheaper prices.
2、焊法蘭：用于法蘭與管子的對口焊接,其結構合理,強度與剛度較大,經得起高溫高壓及反復彎曲和溫度波動,密封性可靠，公稱壓力為0.25～2.5MPa的對焊法蘭采用凹凸式密封面。
2, welding flange for butt welding flange and pipe, reasonable structure, strength and stiffness to withstand high temperature and high pressure and repeated bending and temperature fluctuation, reliable seal, nominal pressure 0.25 ~ 2.5MPa welding flange seal surface using bump.
3、套法蘭
3, set flange
常用于介質溫度和壓力都不高而介質腐蝕性較強的情況。當介質腐蝕性較強時，法蘭接觸介質的部分為耐腐蝕的高等級材料如不鋼等材料，而外部則利用低等級材料。
Often used in medium temperature and pressure are not high, and medium corrosive situation. When the medium corrosion is strong, the flange contact medium part is corrosion resistant high-grade materials, such as non steel and other materials, while the external use of low-grade materials.
4、體法蘭：常常是將法蘭與設備、管子、管件、閥門等做成一體，這種型式在設備和閥門上常用。
4, body flange: often flange and equipment, pipes, pipe fittings, valves and so on into one, this type of equipment and valves on the commonly used.
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