Zhejiang Rihong Frequency Converter Co., Ltd. is a high-tech enterprise specializing in the design, development, production, and sales of frequency converters and soft starters. It introduces advanced frequency conversion core technologies from abroad and is at a leading level in the same industry in China. Rihong Company has a high-quality, young, and efficient design and development team. The company has implemented a high-starting point, high-quality, and high-level "three high" strategy. It has a first-class talent, technology, equipment, and service, and implements strict scientific management. This makes the frequency converters and soft starters carefully developed by Rihong people are widely used in industries such as steel, metal products, pharmaceutical and chemical industries, textile and dyeing, machinery and machine tools, and factory construction. The constant pressure water supply system is widely used in fire fighting, waterworks, high-rise buildings, residential areas, and other water supply.