Since 1964, we have been operating in the national and international valve-market under the name of SISTAG. During this time, the company has been responding continuously to the requirements of a growing and at the same time increasingly demanding customer base.Our brand name Wey is worldwide recognized and internationally protected. In the industry, the name stands for Swiss quality, both with regard to the product and the support we offer. This reputation of the Wey products is based on exceptional functionality and process safety, ease of maintenance and long service life.Our Wey products perform in a broad range of industries & applications. Whether mining, water treatment, food & beverage, chemical or petrochemical industry, biomass, cement or waste handling – whenever fluids, powder or slurries need to be controlled, companies rely on Wey products.