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Sistag with its brand Wey Valve are experts in gate valves, but also supply butterfly valves and water locks. Sistag stands for the highest quality. The valves are manufactured in Switzerland and the USA, and each and every product is checked according to the strictest criteria. 180 employees in Switzerland, Germany, the USA and Singapore work to ensure that each and every product exceeds your requirements. Sistag/Wey supplies valves to the mining, paper, food and beverage, water and wastewater, oil and gas and chemical processing industries. It has often been copied, but no one has succeeded – ever since Joseph Wey's invention and the launch of the Wey brand, Sistag has set standards worldwide.