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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 900lb centerline 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. 900lb centerline butterfly valve It is a copolymer that combines the carbon-fluorine backbone of fluorocarbons with a perfluoroalkoxy side chain.