The 200MW and 300MW generator sets of Sha A Power Plant utilize heavy-weight liquid-controlled check butterfly valves at the circulating water pump outlet. These valves can be linked with the circulating water pump for control; after the butterfly valve is pre-opened by 15°, the circulating water pump can be started. Once opened, the hydraulic drive system automatically maintains pressure, preventing the heavy weight from descending. Even if there is a minor oil leak in the hydraulic system causing the heavy weight to fall more than 15°, the electrical control system can automatically activate the oil pump motor to replenish oil, maintaining pressure. When the circulating water pump is shut off, the butterfly valve联动 closes in two stages—quick and slow—to prevent the rise in water hammer pressure within the pipeline during valve closure, buffering and protecting the pipeline, and preventing the reverse rotation of the circulating water pump. Due to their check and cutoff functions, these butterfly valves effectively prevent water hammer and offer numerous advantages such as pump-valve linkage and safety reliability. Since their introduction, they have been widely used in industries such as water, thermal power generation, public water supply and drainage, and chemical metallurgy. In recent years, they have developed into various forms and structures, including anti-seawater, anti-silt, locking, hammer-free, and three-dimensional eccentric butterfly plate structures. However, the basic control method remains electrical-hydraulic, with the hydraulic system characterized by its simple, reliable, and easy-to-maintain principles.
News Center Co., Ltd.
