The ISG type low-speed vertical centrifugal pump is based on the vertical centrifugal pump and equipped with a low-speed motor, which significantly reduces the operating noise and doubles the service life of the vulnerable parts. It is mainly used for the circulation and terminal pressurization of chilled water and cooling water in air conditioning systems, local or terminal pressurization circulation in urban heating systems, local constant pressure in urban building fire protection systems, and the matching of various air conditioning hot water boilers.