What is the function of the fire-fighting pressure stabilizing device of the main pump, water pump and drainage pump?

Your question is a summary of the pumps used in the fire water system, which is explained as follows:

The main pump of fire water supply is mainly used for fire fighting and extinguishing in case of danger.

Fire-fighting pressure stabilizing device: a small booster pump used in conjunction with the main fire-fighting pump. Usually, the pressure range of fire protection system is set by differential pressure gauge. When the pressure is lower than the set value, the fire-fighting pressure-stabilizing pump will automatically start to replenish water to keep the fire-fighting system within the set pressure orientation. If the pressure is not replenished in time, the alarm system connected with it will give an alarm. Therefore, the main function of setting the fire-fighting pressure-stabilizing pump is that when the pressure of the fire-fighting system drops due to leakage, the fire-fighting pressure-stabilizing pump will supplement the water and pressure required by the fire-fighting system. If there is no fire-fighting pressure-stabilizing pump supply, only the main fire-fighting pump can be turned on to replenish water, which will cause some waste.

Production water pump: mainly used in production and living systems to provide water resources for production and life.

Drainage pump: it is mainly used to discharge waste water generated by leakage, overhaul and maintenance of production, life and fire protection systems.