Weighing up to seven tonnes and the size of a family car, this firm’s valves are used to control high-pressure flows in oil and gas pipelines. New contracts with overseas customers, including Brazil’s biggest company, Petrobras, boosted international sales to £18.5m in 2012. In 2000, the Cheshire business was spun out of Oliver Valves (No 75). It is chaired by Michael Oliver, 74.
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