Sistag AG
About us
As a future-oriented family company with Swiss roots, we set standards in the international valve industry since 1964 with our product brand Wey. Knife gate valves, butterfly valves, and water control gates are our expertise. For every single product we dedicate our full attention to each and every detail. Starting with the very first conversation, we develop solutions for our customers, that will stand the test of time and be able to meet future challenges. Whether in mining, in the pulp and paper or food and beverage industry, in wastewater treatment, biogas/chemical plants, or in countless other applications. All over the world.
Products & services
Wey Knife Gate Valves
Equipped with the unique “Original Wey Design” sealing system, our knife gate valves are suitable for the most extreme conditions. They cope with diverse differential pressure scenarios, abrasive and corrosive materials, and extreme temperatures. We can provide customized valves, in a wide variety of materials and sizes and with a range of options.
Wey Butterfly Valves
Whether in relation to water treatment or industrial processes, Wey butterfly and check valves work perfectly even under the most difficult conditions and are easy to maintain. Their design and material composition is derived from many years of technical and practical experience. With our comprehensive, modular range of valves, specific customer requests can be made to measure.
Wey Water Control Gates
Bidirectional, custom-made and compatible with all installation environments, the high-quality stainless-steel design is better than standards require. Thanks to this technical refinement, quality, and range of possible uses, we have become the first choice for numerous applications.