A headache for people who don't know much about equipment when purchasing fire fighting equipment is to buy refurbished equipment at the price of a new product, which is not as good as new equipment in terms of performance and value for money. How can you tell if a piece of equipment is refurbished? zjbetter recommends that you understand the following knowledge so that you can avoid stepping on refurbished equipment when purchasing fire pumps.

1、Whether the packaging is standard
Professional manufacturers are more professional in terms of factory, packaging and service. First of all, the packaging is standardized and comes with standardized instructions for product use, installation, use and maintenance, as well as trademarks, models, product nameplate numbers, company addresses and contact numbers, etc., while informal or counterfeit manufacturers do not have such detailed information and the packaging is rougher.

2、Observation of appearance
First of all, observe whether the parts of the product have rust and corrosion, rupture, etc., if there is, it is likely that they are not the original parts. Secondly, observe the details of the production process of the fire pump, observe whether the surface is bright and clean, observe whether the edges and corners of the accessories are intact, if there are gaps in the edges or hidden parts, poor workmanship and so on, it is also possible that the refurbished.

3. Observe the paintwork
If the equipment is refurbished, set aside the surface of the paint can see the old residual paint.

4, the regular fire pump all parts must be intact and complete, in order to ensure the normal and effective operation of the equipment, even a very small sealing accessories, will affect the normal operation of the equipment.

Judging from the surface can only judge part of it, part or need to be used to expose some problems. In short, choosing a reliable manufacturer is one of the most important ways to avoid buying a refurbished machine. A site visit to the factory to understand the strength of the manufacturer can be a close guarantee of the quality of the equipment.

zjbetter has been established for 19 years and has built up deep trust and friendship with new and old customers at home and abroad over a long period of time. The company's production workshop is more than 20,000 square meters and is expanding with the development of the business. The company's product quality is excellent, the company's production and technical personnel are equipped with high professional skills, from the selection of components and assembly processing technology, to ensure that the customer to improve the professional service.

The fire pump manufacturer zjbetter reminds you that the overhaul should first check the power supply, the power supply, the connection of the connector, whether the three-phase power supply is out of phase, the switch, whether the fuse is blown and so on. The circuit is determined to be free of problems before checking whether the pump itself is seeking in mechanical failure. zjbetter has compiled a list of common failures of pumps and methods of elimination for you.

The fire pump is an essential piece of equipment for many companies, and when the equipment fails, it needs to be taken very seriously and the problem needs to be solved in time. First of all, choose a reliable manufacturer to reduce the failure rate of the equipment, when there are some common small problems, as long as you master some quick troubleshooting methods, many can be solved by themselves, of course, in practice to deal with the failure, should be based on the actual situation and operation, do not operate blindly! To avoid causing greater damage to the equipment.

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.