The BWS-WE fully variable frequency non negative pressure system is developed by Leo based on non negative pressure stable current regulation and intelligent variable frequency energy-saving technology; On the basis of traditional non negative pressure, the product is designed with a cavity structure to ensure both the safety of municipal pipeline water supply and the constant pressure at the water end during peak water usage; At the same time, when using low flow water, it can minimize the number of starts of the booster pump group and reduce equipment energy consumption. The product can be equipped with a Leo IPM permanent magnet variable frequency pump, which integrates permanent magnet variable frequency technology with automation technology and Internet of Things technology to achieve a safe, efficient, intelligent, and stable water supply solution.