The jockey pump is a kind of fire pump. It's used to stabilize the pressure of the automatic sprinkler system and the fire line water force system, so that the system water pressure is always in the needed pressure state. Once the sprinkler or fire line comes out of water, it can flow out to meet the requirements of fire fighting water volume and water pressure.
The jockey pump and the supporter pump are both types of constant pressure installations for fire pumps. The supporter pump works when the sprinkler head and fire line haven't flowed out, and the supporter pump works when the sprinkler head and fire line have discharged water, but the water pressure of the fire fighting water is inadequate, and the water pressure needs to be increased. Different from the supporter pump, the pressure stabilizer pump is used to keep the tone- scattering system and the fire line system under the needed pressure conditions. Its function is veritably egregious, so the supporter pump appertained to in the specification basically refers to the stabilizer pump, especially the stabilizer pump of the automatic sprinkler system.
When the pressure of the fire pipe network( spray, fire line) is advanced than the set( design value), the supporter pump will automatically stop running. When the pressure of the fire pipe network( sprinkler, fire line) is lower than the set( design value), the supporter pump will start automatically.

Long- shaft fire pumps are the choice of numerous guests and play an important part in people's fire safety. Of course, in order to more play its part, as well as better use and conservation of the pump, the following these preventives about the long- shaft fire pump you know.

(1) Fire water pumps refer to special fire water pumps or ordinary clean water pumps that meet the national standard "Fire pump performance requirements and test methods" GB6245.
(2) Hydrant pump is a colloquial term for fire pump. It is often referred to as a pump that supplies water to fire hydrants within a stake.
(3) indoor hydrant is the supply of water from the indoor system to the fire site. The valve interface is used in fixed indoor fire protection systems such as factories, warehouses, high-rise buildings, public buildings and ships. It is usually installed in a hydrant box and is connected to a firefighter's hose and water gun and other common use equipment.
The indoor fire hydrant system and the outdoor fire hydrant system are also among the important fire protection systems, but note the differences between them when using them, and there are some differences in operating methods and scope.

Fire pump is the collaborative term for a variety of specialised pumps used in the water force of fire repression systems, fire pumps being spray pumps, line pumps and jockey pumps, also known as fire pumps.
The general design and construction of fire pumps, line pumps, spray pumps and line pumps, in fact, all under fire pumps, simply refers to the use of different systems and differences.
Simply different parameters( inflow, head, capacity,etc.), the pressure is different because it sets the system the inflow of the line system and the sprinkler system. When it comes to structure and function is the same, a sprinkler pump is a fire pump.
Spray pumps
Sprayr pump tone- priming is the rupture of the glass ball of the snoot through each defensive area of the pipeline network under high temperature, thereby causing the inflow of water in the pipeline network, connecting the alarm stopcock to the pressure switch operation.
Work to achieve the purpose of tone- expanding springs. By reporting the total circumstance of water inflow index draw- in modules and pressure switch control to the control centre, the fire control room can directly reflect its operating signals.
At the same time, the control centre should be suitable to directly control the starting and stopping of the sprinkler pumps.
Fire Line pumps.
Pressure stabilising pumps these pumps force water to hydrant fire- extinguishing systems and automatic sprinkler fire- extinguishing systems and maintain the pressure in the pipeline system.

Product description of XBC series diesel fire pump
XBC series diesel engine fire pump is a new type of fire fighting equipment developed in accordance with GB62

Not just fire pumps, but water pumps in general, from large outdoor pumps to the ball-less pumps that keep almost everyone's basement free of water.

There are two initial types of water pumps, centrifugal and forced circulation. As you pointed out in your question, the former is the most common, while the latter is only used in emergencies.

The former is due to the smaller moving passage (a rotating impeller in a housing compared to a piston with a drive rod and crankshaft) and the fact that a centrifugal pump can rotate without supply from the outlet, whereas a positive relegation must push water out of the outlet or suffer catastrophic failure. Imagine that the shut-off valve closes when the booster pump is running and you have forgotten to turn off the pump, or that one of the automatic shut-off valves or the booster valves has failed. It would explode because the water is not compressible.

They are simply cheaper, more reliable and less economical.