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Blackhall Valves of the United Kingdom was contracted by the Tarrant Regional Water District to supply the largest gate valves for the Integrated Pipeline Project, which completed phase one in spring 2019.
“Their resulting high-pressure DN2800 / 108-inch parallel faced metal seated gate valves are considered to be the world's largest.”valve-world.net
Summarized from public sources; check the original articles before acting on it.