ZJBETTER obtained another certificate at the end of the year: "UL Witnessed Test Laboratory" certificate

At the end of 2022, UNDERWRITERS LABORATORIES INC., the global leader in safety product testing and certification, awarded the "UL Witness Test Data Program (Witness Test Data Program, WTDP)" certificate.


As a global independent safety science company, UL has international advanced technology and resource advantages in the field of testing, certification and standard development. As an industry expert in global market compliance solutions, since entering China in 1980, it has always been committed to serving the local area with international advanced technology and experience, providing one-stop integrated services such as localized testing, certification, inspection, and training. The "UL Witnessed Test Laboratory" is a relatively flexible certification method provided by UL for manufacturers. Passing the UL witness test audit means that in an accredited laboratory, with the witness of UL engineering personnel, Accreditation of project testing improves product certification efficiency.

BETTER TECHNOLOGY GROUP (ZHEJIANG) MOTOR CO LTD is currently equipped with domestic first-class motor laboratory resources and testing teams. In recent years, under the impetus of national technological innovation and reform, the company has continued to introduce new products and encourage product upgrades on the basis of maximizing product quality and safety compliance. The experimental items and methods of the three-phase asynchronous motor in the motor laboratory all meet the following standards.
1. UL1004-1 Rotating Electrical Machines – General Requirements
2. UL1004-5 Fire Pump Motors
3. GB 755-2019/IEC 60034-1:2017 "Rating and Performance of Rotating Electric Machines"
4. GB/T 1032-2012 "Test methods for three-phase asynchronous motors"
5. GB14711-2013 "Safety Requirements for Small and Medium-sized Rotating Electric Machines"
6. GB12350-2016 "Safety Requirements for Small Power Motors"

The test items that can be tested in the UL witness motor laboratory include: cold resistance, hot resistance, heat test, load test, locked rotor test, M-S test (T-n test), noise test, vibration test, insulation resistance test, power frequency withstand voltage test Wait. The motor power index data output is efficiency, power factor, maximum torque multiple, minimum torque multiple, locked rotor torque multiple, and locked rotor current multiple. The maximum power of the motor experiment is 355kW, the motor frequency is 50/60Hz, the motor voltage is 100-690V, and the number of motor poles is 2-12P.

The award of the WTDP laboratory certificate will further provide BETTER TECHNOLOGY GROUP (ZHEJIANG) MOTOR CO LTD with services in product safety testing and technical guidance. After obtaining the UL witness laboratory certification, the company will be able to complete the UL certification project by itself. The test has greatly promoted the progress of the launch of motor products, provided strong support and guarantee for the development of BETTER TECHNOLOGY GROUP (ZHEJIANG) MOTOR CO LTD, and strengthened the leading position of BETTER TECHNOLOGY GROUP (ZHEJIANG) MOTOR CO LTD in the vertical field of motors.

What are the key points of fire pump acceptance?

1. The total number of probes, buttons and modules on the main unit, whether domestic or imported, cannot exceed 3200 points. If this number exceeds this number, the main unit should be added.

2. Water pumps and fans are not allowed to start with frequency conversion, they must be started directly in one step, and frequency converters are not allowed in the control cabinet.

3. The number of loops is not allowed to exceed 200. If this number is exceeded, additional loops will be added. And an isolator should be added to the circuit, and an isolator can only have 32 points.

4. Modules are not allowed to be installed in strong current distribution cabinets (boxes), but should be installed in special module boxes.

5. In a building, no matter how many sound and light alarms there are, no matter how many broadcasts there are, all of them should be activated in case of fire, and every part and every corner should be aware of the fire at the same time for quick evacuation.

6. No matter how far the fire pump is linked with the 24V power supply, the voltage should not be lower than 22.8V when measured with a multimeter on site. If it is lower than this number, an additional 24V power supply should be added on site.

7. Construction personnel, when wearing 24V power lines in the future, they should wear fire-resistant copper core wires, which are the lines starting with NH, and the cross-section is not less than 1.5 square meters. The signal line can reduce the requirements. Use flame-retardant type, which is the line starting with ZR .

8. In the event of a fire, ordinary power, escalators, sewage pumps, recreational facilities, kitchen electricity, etc. should be cut off immediately; other normal lighting, domestic water pumps, security systems, passenger elevators, etc. should be cut off later or selectively cut off manually , to facilitate the evacuation of personnel.

9. When the manufacturer compiles the linkage relationship, one probe should not be used to link the fire pump facilities, but any two probes in the area or any probe plus any manual should be used to start the linkage.

10. In future residential buildings, 1.3 to 1.5 of the entrance of the residents should be equipped with an independent household alarm system, and smoke detectors and combustible gas detectors should be installed in bedrooms and kitchens.

Layout requirements and installation methods of fire water supply pipes and causes of water leakage

1. Requirements for outdoor fire pipeline layout

(1) When two-way fire water supply is used for outdoor fire water supply, ring pipe network should be used, but when one fire water supply is used, branch pipe network can be used.

(2) There are no less than 2 water inlet pipes delivering water to the ring pipe network, each of which can pass through the entire flow.

(3) Valves should be used to divide the circuit into separate parts. The number of outdoor fire hydrants in each section shall not exceed 5

(4) The diameter of the outdoor fire water supply pipe should not be less than DN100. When conditions permit, it should not be less than 150mm.

Pressure reducing valve setting

(1) A pressure relief valve should be installed before the inlet of the alarm valve. When connecting two or more alarm valves, a backup pressure reducing valve should be installed.

(2) A filter should be installed at the inlet of the pressure reducing valve, and the flow area should not be less than 4 times the cross-sectional area of the pipeline;

(3) The pressure gauge should be installed before and after the filter and pressure reducing valve. The diameter of the pressure gauge should not be less than 100mm, and the range should be twice the design pressure;

(4) The control valve should be installed before the filter and after the safety valve.

(5) After the pressure relief valve, a pressure test drain valve should be installed;

(6) The pressure reducing valve shall be equipped with a flow detection test interface or a flow meter;

(7) Pressure relief valves installed vertically shall flow downward.

(8) The proportional pressure reducing valve should be installed vertically, and the adjustable pressure reducing valve should be installed horizontally.

Indoor fire water supply pipeline

1. The following fire water supply pipe networks are circular:

(1) Supplying water to two or more buildings;

(2) Water is supplied to more than two water fire extinguishing systems;

(3) When using a temporary high-pressure fire water supply system with a high fire water tank;

(4) When supplying water to an automatic water fire extinguishing system controlled by two or more alarm valves.


A fire pump is a machine used to transport fire water. However, because some failures are prone to occur under different working conditions, the water leakage of the fire pump is one of them. There are both internal leakage and external leakage of fire pump water leakage, but any of them will affect the normal flow and lift of the fire pump.

First, it's easy to understand leaks. The leakage is that from the outside of the fire pump, it can be clearly seen that there is water leakage from the fire pump body. The location of the leakage is not fixed, but most of the leakage occurs on the mechanical seal, shaft seal and motor joints, even on the surface of the pump body. .

The internal leakage of the fire pump cannot be displayed, but its flow rate and lift are significantly reduced. However, whether it is internal leakage or external leakage is a fire pump failure, we need to identify it carefully and deal with it in time to prevent greater failures.

2. Causes and treatment methods of fire pump leakage

There are many reasons for fire pump leakage, including damage to the sealing surface, unevenness, loosening of bolts during installation, sand holes or cracks in the pump body, etc. Check the location of the fire pump leak to determine if there is a possibility of damage near it. For example, there is more leakage near the mechanical seal, so we can first judge the problem of the mechanical seal. If the pump body leaks, the pump body may have cracks.

After determining the cause of the leakage, the fire pump will be dismantled for further confirmation. If it's a sealing problem, you'll need to reseal and replace the gasket. When it is confirmed that there is a crack in the pump body, it should be replaced directly, and it is forbidden to continue to use it.

The reason for the internal leakage is mainly due to the damage of the check valve. In order to judge whether there is an internal crack, it is only necessary to stop the fire pump for a period of time, and then observe the pointer of the pressure gauge installed on the outlet pipe of the fire pump. You can accurately determine if the pump is leaking without changing it. If internal leakage is found, the seal of the check valve needs to be repaired or replaced with a new one.

What to do if the fire pump produces noise and what are the more common problems

1. When the pipeline fire pump noise occurs, the most likely fault is the imbalance of the fire pump rotor. Since the water output of the fire pump mainly depends on the high-speed rotation of the rotor, when the rotor is unbalanced for some reason, it will cause the fire pump to deviate from the original rotation track during the rotation process, resulting in the fire pump appearing in the pipeline. When judging the failure of the rotor, it is mainly to replace the rotor of the pump or make a balance hole on the rotor blade of the pump to find out the balance difference.

2. The production noise of the fire pump pipeline has a certain effect. For example, forcing a small flow of a pipe "fire pump" to increase power to increase the original flow will create vibrations in the fire pump. Therefore, whether you use a pipeline fire pump or other types of water pumps, you should follow the water pump use standards to prevent the water pump from making noise, which will affect the service life of the water pump. The solution is to use the pump according to the instructions. If the efficiency of use is affected, it is recommended to replace the appropriate pipeline "fire pump" for use.

3. The installation did not meet the standards, resulting in abnormal noise from the pipeline fire pump. Fire pumps and fire hydrant pumps vibrate at a high frequency during operation, so they must be fixed during installation. If the bolt between the pump body and the base or between the base and the base is loose when installing the pipe fire pump, the transmission shaft between the pump body and the motor of the pipe pump will be bent. It lowered the concentricity and caused an imbalance in the fire pump rotor. This is one of the noise phenomena of fire pumps. In order to improve this phenomenon, the pump shaft of the fire pump needs to be balanced and then reinstalled. Finally, the base of the pump was reinforced.

4. Blockage of the impeller passage can also cause fire pump noise. When the internal flow channel of the fire pump is blocked by foreign matter, it will cause uneven resistance of the fire pump impeller and vibrate the fire pump. Therefore, it is necessary to regularly disassemble and maintain the fire pump to prevent foreign matter from blocking the pipeline.

5. The bearing of the fire pump is damaged. Bearing damage generally does not occur on the main body of an in-line fire pump. If there is a problem with the quality of the pump, or because some hard objects enter the pump body of the tube pump, the bearing is damaged, and the rotor is unstable at first. Causes noise from pipeline fire pumps.

6. Finally, cavitation, cavitation occurs in any type of pump, but some are obviously not noticeable. If cavitation occurs, consider raising the fire pump or increasing the pressure in the piping. If the cavitation phenomenon cannot be changed, the fire pump model needs to be redesigned and replaced.

1. Why is the fire pump also called XBD fire pump set?

Answer: In fact, the water pumps used in fire protection are not only XBD fire pump sets. Fire pumps can be divided into ordinary fire pumps XB and vehicle fire pumps CB according to their mobility. According to the characteristics of the prime mover, they also include electric motors (D), gasoline engines (Q), and diesel engines (C), so XBD can be understood as ordinary electric fire pumps .

2. Are all water pumps subject to anti-corrosion tests?

A: Before installation, fire pumps are often subjected to many tests such as performance, operation, vacuum sealing, corrosion resistance, etc. to ensure that the pump can be used normally for a sufficient period of time. When the material of the flow-passing parts is aluminum alloy, bronze, stainless steel, and the material of the pump casing is cast iron, cast copper, or cast aluminum, anti-corrosion tests are not required because of the chemical properties of the material.

3. Are the most important parameters of the fire pump the flow and lift or the flow and pressure?

Answer: First of all, we must understand the relationship between pressure and lift: pressure = liquid density * g * lift (g = 0.981). In fact, the fire water pump can not only transport water, as long as the physical and chemical characteristics and water liquid are fine, but most of them transport water in daily life. The density of water is 1 ton per cubic meter. It can be obtained from the above formula : Pressure=1000*0.981*lift, pressure=0.981*lift, at this time the pressure and lift are almost the same, so whether we refer to lift or pressure, it can basically be regarded as a parameter.

How to maintain the fire pump correctly and choose the electrified power reasonably

How to maintain the fire pump is the simplest and most economical repair. It is necessary to prevent damage to the fire pump that prolongs the service life and prolong the service life. Naturally, it saves us money. In order to save costs, our daily maintenance can be like this.

First of all, check whether the oil level is normal and cannot reach the oil mark line on the normal surface. If it is not, we must replenish it in time, but remember one thing, it cannot exceed the amount of the oil quantity indicator line.

Secondly, check the radiator. The water is appropriate. If it is not added in time, the water that needs to be added must be clean water, as long as it is clean water, or tap water is fine. Why not use groundwater, because impurities in groundwater can easily form scales in the water tank, which affects the cooling effect and is also prone to failure. In winter, we drive to preheat the car, add coolant to the car, and the fire pump is no exception. The weather in the north is very cold, so add the coolant to the fire pump according to the actual temperature.

Finally, check the installation of each part of the fire pump, such as whether they are stable, the connection between the screw and the screw, if there is any looseness, tighten the screw in time. To clean the fire pump, soak a canvas or dry cloth and wipe slowly on the body or on surfaces made of grease or dust.


Only when the power is in the normal range can the fire pump be used efficiently. The requirements for the use of pump equipment are relatively strict, and there may not even be a slight leak, otherwise the use of the pump will be adversely affected. I hope that you need to know before using the pump. Remember:

The energizing power should be selected reasonably.

1. Water irrigation treatment Before selecting the power-on power, make sure that the fire pump is turned off, and the water in the pump should be filled to increase the suction, so as to make the pressure difference larger and quickly clean up some acid-base reagents and other pollutants. Make sure to fill the water well.

2. Selection of electrified power The horsepower of the fire pump will be selected according to the size of the pump. Before electrifying the pump, carefully check the electrical power. Once the power is not grasped accurately, it is easy to cause insufficient suction. Therefore, in order to make it have sufficient suction, the power should be selected reasonably. If there is no electricity, the fire pump cannot be started, let alone used. But does it mean that the pump can be used as long as there is electricity? Not necessarily, the pump can only be used if the electrified power is reasonable and the voltage is within the normal range.

What to pay attention to when choosing a fire pump certification company and how to maintain a fire hydrant pump

Fire pumps are pumps used in fire fighting. They are divided into different types. Because of their fully sealed, non-exposed and corrosion-resistant characteristics, they are widely used in environmental protection, water management, fire protection and other departments to pump various liquids. They are leak-free and non-toxic. The ideal pumps for polluting elegant workshops and civilized factories are similar to the pumps used for fire protection, but the head and flow are different.

1. Adjust the tightness of the packing gland at any time according to the operating conditions of the fire pump. Seasoning seal drips 30 to 60 drops per minute.

2. Pay attention to the wear of the seasoning and adjust the filler in time. When replacing the packing, every time the packing is replaced, the joints of each adjacent packing should be staggered by more than 90 degrees, the water seal pipe should be aligned with the water seal pipe, and the opening of the outermost packing should be downward.

3. The fire pump should increase the lubrication or grease in the bearing in time to ensure that the oil level is normal, and check the oil quality change on a regular basis. If the oil quality is not good, replace it with new oil.

4. Regularly check the limit switch of the electric power valve and the manual and electric interlocking equipment.

5. The vibration of the pump should be checked regularly. When the vibration is unreasonable, the cause should be found out and dealt with in time.

6. Check, adjust and replace valve packing regularly to ensure no water leakage, no oil stain and no rust.

7. When using soft packing to seal, the packing should be added at any time according to the actual situation to prevent leakage.

8. The parts and components of the fire pump should be completely intact, and the handwriting on the assigned nameplate should be clear.

9. The external parts of the equipment should be perfect: no rust, no oil leakage, no electricity leakage, no water leakage, no air leakage.



The focus of the next step for fire pump manufacturers is how to maintain and maintain them. The more you pay attention to maintaining it, the more time you spend getting the product.

The maintenance of the fire hydrant pump is too much.

First, every time it is used, the location must be checked to ensure that the power supply and circuit of the fire protection system are in normal working condition. It is important to check regularly, 5 days a month. What to check? The lubricating oil level in the pump must be checked, and the filling position must be checked to see if it is in the center of the oil window or not above the center line.

Second, be punctual when checking the water on the pump and record relevant information. After the pump is officially started, check the operation of the float ball, and there must be no water in the exhaust pipe. If so, replace the floating ball seal in time. After the pump is started, check whether the exhaust is normal, whether the vacuum device is tightly sealed, and whether the exhaust is normal.

Fire pump manufacturers believe that the importance of maintenance and maintenance of fire hydrant pumps makes the service life longer