Flowserve, Ball ValveFlowserve Corporation’s NAF Duball DL ball valve product range now includes certified fire-safe design and Pressure Nominal (PN)-rated versions. The fire-safe design is the latest addition to the existing full bore, NAF Duball DL valve product range. It was successfully tested and certified according to API 607, 6th Edition, and ISO 10947:2010. The tests were completed for both soft- and metal-seated versions and have been certified by Lloyd's Register.

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