This valve is suitable for pump outlet pipelines where the medium is water. It is used to avoid and reduce excessive water hammer caused by medium backflow in the piping system, thereby protecting the system.

1. The valve closes by means of counterweight potential energy, offering flexible and reliable operation.

2. Installed after the pump, it can replace two separate valves (a gate/butterfly valve and a check valve). Its flow resistance coefficient is only 30% of that of the two valves combined, making it an energy-saving product.

3. In the event of a power failure, the valve can be operated manually.

4. The closing of the butterfly valve consists of two stages: fast closing and slow closing, both with adjustable time and angle. The fast‑closing stage begins with an adjustable angle range of 60°–80° and an adjustable time range of 5–20 seconds. This is followed by the slow‑closing stage with an adjustable angle range of 30°–10° and an adjustable time range of 10–50 seconds.

5. This valve has a pressure‑holding function and is equipped with a backup reset device.