As a fire pump manufacturer, every day there will be a lot of problems consulting, many of the customers for the pump head becomes low this problem raised questions, the following zjbetter Xiaobian to share with you, the pump head reduced for several reasons, so that customers in the use of fire pumps can pay attention to avoid this problem, but also to solve the problem themselves.

1, impeller flow channel blockage
First of all, the most intuitive problem, check whether the impeller is stuck in the main blockage, if so, timely cleaning can solve the problem. If necessary, filtering devices can be added to the front of the pump inlet to avoid the impeller runners being blocked again.


2、Inside leakage
When the gap between the connection points of various parts in the pump is too large, it will cause the pump to leak, resulting in a drop in discharge pressure. When this problem occurs, dismantling and repair should be carried out.


3、Cavitation
If the inlet piping system has no blockage or the inlet valve opening is too small, resulting in the pump inlet pressure is lower than the saturated steam pressure of the pumping medium, it will form cavitation. At this time, the blockage should be cleared or the inlet valve should be opened wide, or the liquid level of the inlet pool should be increased.


4、Decrease in rotational speed
Check whether the speed of the pump is reduced because of certain factors, the speed is proportional to the head, if the speed of the problem, check the reasons, reasonable solutions.


5、Motor reversal
Observe the steering of the pump, if the steering is reversed, exchange the two wires on the terminals of the motor.


Of course, there are more other reasons for the pump head to reduce, the above is only part of one of the common problems. Over the years, the company has been equipped with a strong technical team, zjbetter professional team can provide you with efficient and convenient service, the company's professional sales engineers can provide you with a quick quote, factory direct sales, favorable prices and quality. In recent years, the company has also passed the UL and CE certification, giving customers a strong guarantee to buy and use with confidence.

Translated with www.DeepL.com/Translator (free version)

First, what is a water pump? It is a device used to transport liquid, pressurize the liquid, and make the liquid from the first liquid level to the high liquid level. The first water pump invented by the Chinese is called "water windmill". Later, around 300 BC, the emergence of the "Archimedes screw pump" is more similar to modern pumps. In addition, the following basic knowledge points are what you must understand.

There are countless fire pumps of various types and models on the market, and various needs of various occasions are relative to various types of fire pumps. The most common classification forms of people are horizontal and vertical fire pumps. What are the differences between these two types in terms of performance, installation methods, maintenance, etc.? zjbetter shares with you the difference between vertical fire pump and horizontal fire pump.

First of all, in terms of performance, both are centrifugal pumps, and the hydraulic power is basically the same, and they cannot be distinguished in terms of performance. To find the difference between the two, we can look at it from several other aspects.

First of all, the performance issue that most people are concerned about, in fact, there is no difference in the performance of the two forms. The only difference is the appearance, connection form, installation form and maintenance. Let's discuss the difference between the two in detail.

1. Connection form

The horizontal water pump is connected with the motor by the coupling, which needs to be aligned regularly; the vertical water pump is superimposed and connected from the bottom to the top, and the vertical water pump is generally called the pipeline pump.

2. Installation form

Compared with vertical water pumps, vertical water pumps are easier to install. The horizontal pump set is provided with a base, and precision adjustment is required after installation.

3. Maintenance difficulty

Since the vertical water pump is composed of upper and lower layers, the maintenance of the vertical water pump is more difficult. For example, to repair the impeller, it is necessary to remove all the parts above the impeller before repairing; while the horizontal water pump is relatively easy. For example, the IS type pump can perform impeller maintenance by removing the inlet pipe.

4. Floor space

It can be seen from the appearance that the horizontal water pump has a base due to its horizontal structure, so it occupies a large area.
The above is the main difference between the two styles of water pumps, mainly due to the influence of different structures and connection methods. It can be selected according to actual needs, and there is no difference in performance. When purchasing water pumps, choose a professional manufacturer. Zjbetter has a production workshop of a certain scale, and can customize fire pumps according to your needs. zjbetter quality starts from the parts. The company has a wide range of products, including various fire-fighting booster and voltage stabilizers, diesel engine fire-fighting pump sets, and fire-fighting control cabinets.

Floating impeller axial force self-balancing device

The balancing disc device has two gaps, the radial gap behind the impeller and the axial gap of the balancing disc, because of these two gaps, the balancing disc can automatically adjust the axial l gap to achieve automatic axial force balancing, and the silver rotor is in a floating state.

The principle of the balance plate is transplanted to the impeller, the impeller back mouth ring radial clearance below the axial clearance, this device that is the same as the balance plate, the formation of two gaps, only in a different position. Because the impeller has these two gaps to complement each other, so that the impeller can also achieve automatic axial force balance.

Floating impeller axial force self-balancing device for water pumps

Assuming that the axial force pointing to the impeller inlet increases, the impeller moves to the left, then the axial gap b2 decreases, the leakage decreases, the pressure in the cavity of the back mouth ring decreases, the impeller moves to the right, and so on, the impeller has been in a floating state for left and right adjustment (the balancing disk device makes the whole rotor in a balanced state). The axial clearance below the balance hole or external return pipe to the inlet, so that the pressure in the cavity N is the same as the inlet pressure.


Water pump floating impeller axial force self-balancing device


Many people have wanted to buy stainless steel gate valve such things to help the engineering process, to facilitate the work, but the advantages and disadvantages of stainless steel gate valve such things are not enough to understand, do not know what characteristics it has, what need to pay attention to. So now here is to introduce to you what the advantages and disadvantages of stainless steel gate valves are, so that you can weigh the degree of applicability of this equipment to yourself.

Stainless steel gate valves

The advantages of this equipment are: firstly, it is very convenient to switch on and off, very labor-saving, so it can be carried out very easily; secondly, it is not subject to movement when the fluid flows; thirdly, it is not easy for the sealing side of the equipment to be scoured and eroded, so it is not easy to lead to depreciation; fourthly, the construction of the equipment is simple in shape, so the length of the structure is short, and there is a very good production process, so the scope of application is very wide;.

These are the advantages of this equipment. Of course, in addition to the advantages there are also disadvantages.

Firstly, although the medium does not cause erosion and wear to the sealing surfaces, they do rub against each other and are difficult to repair once there are frictional scratches etc., so this is a disadvantage.

Secondly, although the length of the machine is short, the size of the shape is large, so when opening it is necessary to find a place with a lot of space, and also therefore, the process of switching is longer; thirdly, it is the structure of the machine is more complicated, so for many people who are unfamiliar with the machine, it looks like a problem.

So these are the advantages and disadvantages of stainless steel gate valves, all analysed in great detail for you. If you do not know this equipment before, do not understand its advantages and disadvantages of each what, refer to the above we analyse for you, I believe that will certainly make your understanding of this equipment increased, but also conducive to weighing this equipment is suitable for you.

Water pumps burn the motor mainly for the following reasons.

Starting with a load can cause damage to the motor, the actual use of head is too much lower than the pump nameplate head; submersible pumps without water working time is too long.

First of all, first figure out the motor burn is burned bearing (mechanical failure) or burned coil (electrical failure).

If the fault is burned coil, mainly due to overcurrent, sometimes the voltage is too high or too low can also cause the coil to heat short circuit, so first check whether the voltage when running is too much different from the rated voltage.

Overcurrent short circuit, there may be several reasons.

Equipment overload operation, so that the motor runs at or over rated current for a long time. Special attention should be paid to the fact that the starting current of the motor is 3-5 times the rated current, so you should try to avoid starting the equipment with a load or running at full load (it mainly depends on the matching margin between the rated current of the motor and the normal running current)

The motor works in a more humid working environment. Before starting the motor, the insulation of the coils should be checked for ground and phase insulation, the insulation requirements are different for different voltage levels and can be checked with reference to the relevant national standards. During the operation of the motor, attention should be paid to the waterproofing and moisture-proofing of the motor.

The mechanical failure of the pump machine causes the motor to be overloaded, the current is too high and the coil is burnt.

The heat dissipation of the motor goes wrong. General motor coils are air-cooled shells, submersible pumps are water-cooled shells. Large motors mostly use air-air heat exchangers, air-water heat exchangers for cooling. If the cooling water (air) is broken, so that the coil can not dissipate heat, are likely to burn the coil.

The head of the centrifugal pump is used to overcome the height and resistance, high head of the pump in the high head point of work when his flow is the design point of the flow, if the work at low head, equivalent to the pump outlet resistance is reduced, when the flow of the centrifugal pump will increase, the motor will be overloaded, super to a certain extent will burn the motor. For example, the head of a water pump is 50 meters, the flow is 50 cubic meters / hour, when it to 50 meters high to give water, its flow is 50 cubic meters / hour, when it to 40 meters high to give water, its height and resistance to reduce its flow may reach 80-90 cubic meters / hour or more, then the motor will be hot or burned.


1、Correctly choose the working point of the fire pump. Each kind of pump has a certain working pressure range, such as: 2BV series water ring vacuum pump working pressure range 760mmHg ~ 25mmHg (absolute pressure), in such a wide pressure range, the pump pumping speed with the pressure and change (detailed changes refer to the pump performance curve), its stable working pressure range of 760 ~ 60mmHg. Therefore, the working point of the pump should be selected within this range More suitable, and can not let it in 25 ~ 30mmHg under long-term work.

2, the working pressure of the fire pump should meet the limit of fire fighting equipment and working pressure requirements. For example, if a vacuum drying process requires a working vacuum of 10mmHg, the ultimate vacuum of the selected vacuum pump should be at least 2mmHg, and it is better to reach 1mmHg. Usually the ultimate vacuum of the selected pump should be half to one order of magnitude higher than the working vacuum of the vacuum equipment.

3、The correct combination of fire pumps. Because the fire pump has selective pumping, therefore, sometimes choose one kind of pump can not meet the pumping requirements, need several pumps combined, complement each other to meet the pumping requirements. For example, the titanium sublimation pump has high pumping speed for hydrogen, but cannot pump helium, while the three-pole sputtering ion pump, (or two-pole asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two, it will make the vacuum device to get a better vacuum. In addition, some vacuum pumps can not work under atmospheric pressure, need pre-vacuum; some vacuum pumps export pressure is lower than atmospheric pressure, need pre-stage pump, so all need to use the pump combination.

4、The fire pump should be able to discharge the whole amount of gas produced in the process of fire fighting equipment under its working pressure.

5, fire fighting equipment on the requirements of oil pollution. If the equipment strictly requires no oil, you should choose a variety of oil-free pumps, such as: water ring pumps, molecular sieve adsorption pumps, sputtering ion pumps, cryogenic pumps, etc.. If the requirements are not strict, you can choose to have oil pumps, plus some anti-oil pollution measures, such as adding cold traps, baffles, oil traps, etc., can also achieve clean firefighting requirements.

6、How about the influence of oil vapour discharged from the fire pump on the environment. If the environment does not allow pollution, you can choose an oil-free fire pump, or discharge the oil vapour to the outside.

7、Know the composition of the gas being pumped, whether the gas contains condensable vapour, whether there are particles of dust, whether there is corrosiveness, etc. When choosing a fire pump, you need to know the composition of the gas and choose the appropriate pump for the pumped gas. If the gas contains vapour, particles, and corrosive gases, you should consider installing auxiliary equipment such as condensers and dust collectors on the inlet pipeline of the pump.

8. The vibration generated by the fire pump has no effect on the process and the environment. If the process does not allow, a vibration-free pump should be selected or anti-vibration measures should be taken.

9、The price, operation and maintenance cost of the fire pump.

Diesel fire pumps are a more common piece of equipment often used in fire fighting systems. Our primary consideration when purchasing a pumping station is of course to choose a manufacturer, not only because of the higher cost performance, but also for another reason that the manufacturer has the feature of customizing the fire pump set on demand, according to the customer's needs and choosing the features to customize the fire pump set.

zjbetter professional custom fire pump manufacturers, the company produces zjbetter brand fire equipment are produced by the company's own, its advantage is that the fire can not power, can start normally, to protect fire safety. With a wide range of type spectrum, automatic operation, automatic alarm, automatic start and other functions. It is widely used by various fire hydrants, sprinkler pumps, fire pressure boosting and stabilizing pumps, by various villas, communities, industrial/civil buildings, oil depots, logistics parks, etc.