Jiangsu Huanai Machinery Manufacturing Co., Ltd. is a professional enterprise specializing in horizontal centrifugal pumps, submersible pumps, WFB unsealed self-priming pumps, and IHG pipeline pumps. Our factory has three major series of products, one is the self-priming pump series, the second is the ordinary pump valve series, and the third is the marine pump valve series. Among them, the WFB unsealed self-priming pump is our factory's leading product. This pump combines the advantages of vacuum pumps and submersible pumps, with low vibration, low noise, high efficiency, strong self-priming ability, simple operation, and low maintenance. Especially after adopting the "automatic air control valve", it truly achieves "one-time drainage, lifelong self-priming". With the installation of automatic control devices, unmanned operation can be achieved under various harsh working conditions, greatly reducing workload. At present, this pump can replace traditional domestic and imported water pumps, especially underwater and submersible pumps, which can better leverage its advantages; It can be widely used in power, chemical, petroleum, steel, pharmaceutical, and sewage treatment, under corrosion-resistant working conditions.