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Tufline Lined Accessories have cast dovetail recesses and machined grooves that lock the lining to the body casting. Blow-out or lining DN2000 Flanged butterfly valve collapse are virtually impossible. PFA is the standard lining material for all Tufline Lined Accessories. PFA is a fluoropolymer with extended temperature limits. DN2000 Flanged butterfly valve It is a copolymer that combines the carbon-fluorine backbone of fluorocarbons with a perfluoroalkoxy side chain.