Pressure stabilizing pump is a kind of fire pump, which is used to stabilize the pressure of automatic sprinkler system and hydrant water supply system, so that the water pressure of the system is always in the required pressure state. Once the sprinkler or hydrant comes out of the water, it can flow out the water quantity and water pressure needed to meet the fire water. The steady pressure pump and the booster pump, although they are both pressurized facilities, operate when the sprinkler and hydrant have not flowed out, and the booster pump works at the sprinkler and hydrant, but the water pressure of the fire water is insufficient, so it is necessary to increase the water pump.