The ZSH(DR)WB series double-eccentric butterfly valve, also referred to as a high-performance butterfly valve, uses a special eccentric disc-and-seal geometry. It features compact construction, good shutoff performance and long service life and combines regulating and shutoff functions. It is widely used in chemical, power, textile, food, pharmaceutical and paper industries as well as municipal works and water plants, controlling or isolating tap water, sewage, oils, air, coal gas, natural gas and steam.