Discover the Charm of Pet Tags with RFH's Stainless Steel Marking Technology

 

When you encounter the term "stainless steel graphic marking," it might sound unfamiliar to many. However, its practical application, specifically in the form of "stainless steel tags," is widely recognized. Among these, pet tags stand out as a beloved choice for pet owners.  

 

Pet tags are small, stainless steel plaques designed to be worn by pets, customarily engraved with essential information such as the pet's name, the owner's contact details, or even a cherished pet photo. With RFH's innovative laser marking technology, you can now turn your creative ideas into reality by customizing a unique pet tag for your furry friend.

 

One of the most significant advantages of utilizing RFH's D9-355 UV laser for stainless steel graphic marking is its impeccable preservation of the steel's original texture and luster. The UV laser is specifically designed to avoid damaging the stainless steel surface, ensuring that your pet tag maintains its pristine condition without undergoing any chemical reactions or physical changes.  

 

Furthermore, the use of RFH’s UV laser marking process does not require any additional materials or coatings, making it an eco-friendly solution that does not contribute to pollution or waste. This environmentally conscious approach aligns perfectly with modern sustainability ideals.

 

The permanency of the markings produced by RFH's UV laser is another remarkable feature. Unlike traditional printing methods, our laser marking is resistant to fading, deformation, or peeling due to the effects of time, temperature, humidity, or friction. This durability guarantees that your pet's tag will remain just as vibrant as the day it was created.

 

Efficiency is yet another benefit to consider. With RFH's UV laser technology, a single design or text can be marked in a matter of seconds, offering a rapid turnaround time that is especially beneficial for businesses and pet owners alike.

 

Finally, when compared to other conventional printing methods, the precision achieved with RFH's UV laser marking is unparalleled. It can effortlessly engrave intricate and clear patterns or text, ensuring that each pet tag is not only functional but also a reflection of the pet's personality.

 

In conclusion, RFH's stainless steel graphic marking technology provides an excellent opportunity for pet owners to create personalized, durable, and eco-friendly pet tags. Embrace this innovation and craft a tag that your pet will wear proudly and that you will cherish for years to come.

 

Introducing the RFH Expert III 355

 

—Precision Engineering for Medical Applications

 

In the world of high-precision machining, the RFH Expert III 355 stands out as a meticulously crafted instrument specifically designed to meet the rigorous demands of the industry. This innovative product is set to redefine standards with its exceptional beam quality and unparalleled stability, making it the ideal solution for the intricate processing requirements of medical tubing surfaces.

 

At RFH, we firmly believe that "striving for perfection and pursuing excellence" is not just a motto; it embodies our commitment to delivering the highest quality products. In the high-stakes field of medical device manufacturing, we understand that product quality is paramount — it is, quite literally, a lifeline. This profound responsibility drives our relentless pursuit of innovation, as we strive to push the boundaries of laser technology in the medical domain.

 

The RFH Expert III 355 not only enhances manufacturing efficiency but also ensures that medical devices are crafted to the highest precision standards. With its cutting-edge features and robust performance capabilities, this tool is poised to set a new benchmark for the industry, fostering advancements that will ultimately improve patient outcomes.

As we continue to innovate and refine our offerings, our commitment to quality and excellence remains unwavering. The RFH Expert III 355 is a testament to our dedication to advancing laser technology and its application within the medical field, ensuring that we not only meet but exceed the expectations of our partners and clients.

 

In conclusion, the RFH Expert III 355 is more than just a tool; it is a reflection of our passion for precision and our determination to keep pushing the frontier of medical manufacturing technology. Join us on this journey, as we continue to pave the way for remarkable advancements in medical device production.

The Intersection of Film Technology and UV Laser Cutting

 

 

In recent years, the demand for precision cutting in various industries has grown significantly, particularly for applications involving films in fields such as electronics, optics, medical devices, digital products, and packaging. Traditional cutting methods—mechanical, thermal, and chemical—have their limitations when it comes to achieving the high degree of accuracy and delicacy required by modern applications.

 

 

Enter the RFH D9 series UV laser, a state-of-the-art watercooled UV laser cutting system. The D9 series stands out due to its compact size, high precision, excellent stability, and robust performance. Specifically, the D9-355 model is engineered to handle a multitude of cutting, printing, and engraving scenarios with remarkable ease. 

The capabilities of the D9-355 in UV laser cutting bring transformative advantages to film applications. Unlike traditional methods, UV laser cutting minimizes thermal damage, ensuring that the integrity of sensitive films is preserved. This is particularly crucial in sectors where precision is paramount and even the slightest degradation can compromise the functionality of the final product.

Moreover, the versatility of the D9-355 water cooled UV laser means that it can adapt to varied materials and thicknesses, making it an indispensable tool for manufacturers. Its ability to execute intricate designs with consistent quality elevates the manufacturing process, resulting in superior finished products that meet the rigorous demands of today's consumers.

In conclusion, the advent of compact and high-performing UV laser cutting technologies like the RFH D9 series UV laser is revolutionizing the way films are processed across diverse industries. As we move forward, embracing such innovations will be key to maintaining competitive advantage and meeting evolving market needs.

 

Enhancing Crystal Interior Engraving 

 

RFH F9 5W UV Laser

 

Crystal internal carving is a remarkable craft that beautifully merges art and technology. With the RFH F9 5W UV laser, we are capable of creating stunning three-dimensional patterns within transparent crystals, resulting in unique and captivating visual effects.

 

One of the primary advantages of utilizing the RFH F9 UV laser is its unparalleled precision. This technology allows for **non-destructive processing**, ensuring that the integrity of the crystal is maintained throughout the carving process. Additionally, the high processing efficiency of the RFH F9 translates to faster production times, making it an ideal choice for both artists and manufacturers looking to optimize their workflow.

 

Moreover, the design flexibility offered by this laser is a significant benefit. The adaptability of the RFH F9 can accommodate various intricate designs, giving artists the creative freedom to explore new possibilities in crystal carving.

 

The RFH F9 5W UV laser stands out for its **excellent beam quality** and **stable output performance**. These features ensure consistent results, essential for high-quality production. Its flexible adjustment capabilities further enhance its usability across different projects, making it a reliable choice for diverse applications.

 

In summary, the RFH F9 5W UV laser is revolutionizing the field of crystal internal carving, combining precision, efficiency, and reliability. As this technology continues to advance, we can expect even more extraordinary creations that will push the boundaries of artistic expression in crystal engraving.

 

 

The processes of cotton knitting fabric(scouring, bleaching , dyeing and etc.) is generally carried out in the overflow machine. During the entire processing, the fabric remains in a rope-like state. The fibers constantly bend and deform in the dyeing machine, the original hydrogen bonds are constantly broken while new hydrogen bonds are constantly formed. Sometimes the newly formed hydrogen bonds cannot be fully restored, thus forming chicken claw marks and dead creases on the fabric surface.

In the single-sided fabric structure, tension of the two sides of yarn is asymmetric. After fabric is folded in one direction for a long time, it is difficult to recover. Therefore, among various structures,  especially on fabrics with less or larger weight (eg. plain weave and sweatshirt fabrics) are more prone to crease problems. The generation of creases is also closely related to yarn count and twist. The finer the yarn count and the higher the twist, the greater the possible reversal and untying of the yarn, and the more likely it is to cause crease problems.

 

 

The main process steps leading to creases: scouring and bleaching

1. The general dyeing and finishing process typically involves: fabric preparation → seam sealing → boiling and bleaching in the fabric dyeing machine → dyeing → soaping → color fixing → softening → fabric out from dyeing machine → dehydration → drying. It is commonly believed that creases mainly form in the dyeing machine. However, after rigorous experimental verification by our engineers, it has been found that most cotton knits actually develop creases during the boiling and bleaching stage, which are just not easily observable before dyeing.

 

2. Based on the years of experience of our engineers, the following types of fabric and equipments are prone to developing creases during the boiling and bleaching stage:

Fabric factors: Single-sided cotton fabrics with lighter or heavier weights (e.g., weights <150g or >300g), especially cotton spandex (with elastane) fabrics.

 

Machine factors: Compared to L-shaped overflow fabric dyeing machine, J-shaped overflow fabric dyeing machine are more prone to creating creases due to their stronger stretching force. Air-jet fabric dyeing machine, on the other hand, are less likely to cause creases because the fabric is fully blown open by high-pressure air at the nozzles, allowing the fibers to "rest" from tension, which aids in eliminating internal stress and reducing creasing issues.

 

Process factors: Fabrics that have not undergone prestretching are more prone to creasing. Fixing the fabric under high temperatures can improve fiber proximity and orientation, stabilize fiber morphology and reduce likelihood of changes occurring in dyeing machine, which is beneficial for reducing creases.

350g pure cotton knitted fabric (no creases after dyeing)

 

140g pure cotton knitted jersey (no creases after dyeing)

 

Solutions of scouring and belaching creases 

1. General Method: During boiling and bleaching, as well as dyeing, polyacrylamide-based lubricants are added. The primary role of this type of lubricating agent is to "reduce friction between fabrics and between fabrics and machinery," but it is difficult to resolve creases formed during boiling and bleaching.

 

2. Solution Proposed in This Article: To improve creases during boiling and bleaching, the following auxiliaries, processes, and operations are employed. Satisfactory results have been confirmed through applications by multiple clients.

 

Auxiliaries:

A. Preferentially select a high-concentration and highly soluble polyacrylamide-based anti-crease agent JET (non-ionic) for use in the bath. Its role is to reduce friction between fabrics and between fabrics and machinery.

B. Select new type of anti-crease softener RCE (non-ionic). Its role is to impart good softness and smoothness to the fabric itself, as well as to provide level dyeing properties. 

The combined use of these two auxiliaries is the core of this method.

 

Process:

Reduce the heating rate; the focus is on reducing the cooling rate, with an optimal range of 1.0 to 1.5°C/min.

 

Operations:

Before entering the dyeing machine, the gray fabric should be placed in an area with high humidity in workshop to allow for sufficient moisture regain. During moisture regain, the fibers undergo some swelling, and internal stresses are partially eliminated, which is conducive to reducing creases. After the gray fabric is loosened, it should be allowed to freely pass through a J-shaped trough, while simultaneously being pressed by a press roll or stretched by rollers, which is conducive to eliminating internal stresses and reducing creases.

 

3.Process example

Before boiling and bleaching, add refining permeant, etc., anti-wrinkle agent JET and anti-wrinkle softening agent RCE in the bath, do not heating firstly, cycle for 20 minutes after entering the cloth, so that the grey cloth is fully moistened and the auxiliary agent fully reacts with the fabric fiber. If bleaching is required, caustic soda and hydrogen peroxide can be added before heating. Reduce the rate of heating; Especially to reduce the cooling rate, generally 1.0 ~ 1.5℃/min is better; And it must be completely cooled to 50 ° C to discharge the liquid for dyeing.

 

Other items to prevent creases

1. In order to prevent the generation of creases, it is recommended to add polyacrylamide type lubricant - JET in the bath during dyeing, and reduce the cooling rate.

2. When dehydrating and dry cloth, open width rolling water dry cloth can be used, which not only improves the efficiency of dry cloth, but also helps to solve the problem of creasing. 

3. When stacking cloth, it is recommended that the weight should not be too large and the time should not be too long, especially when the wet cloth is stored.

4. If it is cotton rack (with spandex) fabric using this solution can not completely solve the crease problem, you can consider the presetting process. 

 

5. Generally, the slight crease can be solved by the setting machine, and the stubborn can be returned to the cylinder washing water, gradually heating up to 85 ° C, gradually cooling down to 50 ° C process test repair, or can be re-shaped by steam in the industrial drying machine, which can be repaired according to their respective equipment and crease conditions.

In the field of chemical production, the procurement of chemical centrifugal pumps is a crucial decision. When considering the purchase of chemical centrifugal pumps, many enterprises will turn their attention to small manufacturers, and there are numerous notable advantages behind this.

 

Ⅰ.Outstanding Cost Performance

Small manufacturers possess unique advantages in their cost structure. Compared with large enterprises, their operating costs are lower, without complex hierarchical management frameworks and large-scale marketing expenses. This enables them to provide customers with more affordable chemical centrifugal pumps while ensuring a certain profit margin. For enterprises with limited budgets, purchasing from small manufacturers can effectively reduce procurement costs and achieve higher capital utilization efficiency. Moreover, small manufacturers are often more willing to negotiate prices with customers. Since the scale of orders has a relatively significant impact on them, they will actively communicate with purchasers when facing reasonable price requests, striving to reach cooperation, which makes it possible for purchasers to obtain more favorable prices.

 

Ⅱ.Strong Customization Capability

The technological processes in chemical production are diverse, and the requirements for chemical centrifugal pumps also vary greatly. The flexibility of small manufacturers demonstrates great value in such situations. Their production arrangements are not as restricted by large-scale production as those of large manufacturers, and they can easily adjust production processes and procedures. If purchasers have requirements for special materials, unique size specifications, or specific performance parameters of centrifugal pumps, small manufacturers can respond promptly and carry out customized production. During the entire customization process, the simple internal communication chain of small manufacturers ensures the efficient and accurate transmission of information. Purchasers can directly communicate with technicians and production managers to quickly feed back changes in requirements, ensuring that the customized chemical centrifugal pumps can perfectly adapt to the production environment.

 

Ⅲ.Unique Professionalism

Many small manufacturers focus on the specific segment of chemical centrifugal pumps.Long-term in-depth cultivation has enabled them to accumulate profound professional knowledge in technical aspects. They concentrate their limited resources on the research development and production of specific types of chemical centrifugal pumps, and their understanding and mastery of the products often exceed those of some large comprehensive enterprises. This professionalism is reflected in the control of performance details of chemical centrifugal pumps. Whether it is the flow rate, head, efficiency of the pump, or special properties such as corrosion resistance and wear resistance, they have conducted in-depth research. During the selection stage, small manufacturers can provide precise suggestions to purchasers based on their professional knowledge, helping purchasers choose the most suitable centrifugal pumps for their own chemical processes, and avoiding subsequent usage problems caused by improper selection.

Ⅳ.Obvious Advantages in Delivery Time

In chemical production projects, time is money. Small manufacturers have unique advantages in terms of delivery time. Due to their relatively small production scale, it is more convenient to adjust production plans. When purchasers have urgent order requirements, small manufacturers can quickly arrange production to prioritize meeting the time requirements of customers. Meanwhile, some small manufacturers will reserve a certain amount of inventory according to common market demands. For some commonly used models of chemical centrifugal pumps, purchasers can quickly pick up the goods after placing orders, greatly shortening the waiting time and facilitating the smooth progress of chemical projects.

 

Ⅴ.Thoughtful After-sales Service

Small manufacturers are well aware of the importance of customers to their own development, so they often spare no effort in after-sales service. When customers encounter problems during the use of chemical centrifugal pumps, small manufacturers can respond quickly. They do not have cumbersome after-sales procedures, and technicians can quickly get in touch with customers to understand the problems and provide solutions. Moreover, the after-sales service of small manufacturers is more personalized. They can provide on-site installation guidance, equipment debugging, regular maintenance, and other comprehensive services according to the actual situation of customers. This thoughtful after-sales service not only can ensure the normal operation of chemical centrifugal pumps and extend the service life of equipment, but also can make purchasers feel meticulous care, laying a good foundation for long-term cooperation.

In conclusion, when purchasing chemical centrifugal pumps in China, small manufacturers, with their characteristics in terms of price advantages, customization capabilities, professionalism, advantages in delivery time and after-sales service, have become a high-quality procurement option that cannot be ignored, providing strong support for the stable production and development of chemical enterprises.

 

Ⅵ.Manufacturer Recommendation

At Anhui Changyu Pump and Valve Co., Ltd., our pumps are offered at favorable prices while maintaining excellent quality.

We can customize special materials, unique size specifications or specific performance parameters of centrifugal pumps according to the specific requirements of buyers.

Moreover, our company has been deeply engaged in the production of chemical centrifugal pumps for more than 20 years. This professionalism is reflected in the control of performance details of chemical centrifugal pumps. Whether it is the flow rate, head, efficiency of the pump, or special properties such as corrosion resistance and wear resistance, we have conducted in-depth research.

When there is an urgent order requirement, our company can quickly arrange production to prioritize meeting the customers' time requirements.

When customers encounter problems during the use of chemical centrifugal pumps, our company can respond quickly. We don't have cumbersome. 

The centrifugal pump is a core equipment widely used in the three major industries of water treatment, petrochemical industry and agricultural irrigation. Its high efficiency, energy saving and reliability make it widely used in many industries. As key equipment, centrifugal pumps are used to varying degrees in various industries, and their design and maintenance need to take actual working conditions into consideration. Therefore, in actual use, reasonable operating procedures are crucial. It can not only help users better understand and manage the operation of the equipment, but also effectively improve the service life and economic benefits of the equipment.

 

I: 7 major operating steps of centrifugal pump:

Step 1: "5 inspections" before starting the centrifugal pump

1. Check the status of the centrifugal pump and motor to ensure that there is no obvious abnormality and meet the working conditions

 

2. Check whether the connection of each part is good, whether the anchor bolts are firm, and whether the lubricating oil is sufficient (the oil level needs to be kept between 1/2-2/3) ‌

 

3. Fill the pump, check the water level, and the pipe and pump body must be filled with water (water can be seen from the exhaust hole with the naked eye)

 

4. Check the valve: the inlet valve is fully open, and the outlet valve is closed to 1/4 first (to prevent overload at startup)

 

5. Check the instrument: Is the pressure gauge zeroed? Is the voltage normal? Is the ground wire securely connected?

 

Step 2: Test the feel of the gear by turning the coupling manually for 2 to 3 turns. If it is normal, it will be smooth and without jamming. If jamming and friction sound occur, stop the machine immediately for inspection.

 

Step 3: Press the centrifugal pump switch, press the start button and release it immediately (no more than 2 seconds). Correct steering: The centrifugal pump body vibrates little and the sound is stable (refer to the direction of the arrow on the pump body). If reversal occurs, cut off the power immediately and replace the motor wiring.

 

Step 4: Formal start of the centrifugal pump, slowly open the outlet valve, and control the process within 30 seconds. At the same time, observe the pressure gauge: stable in the green area (such as 0.4-0.6MPa). If the pressure fluctuates, it may be air intake. If the current exceeds the red line, you need to close the valve immediately.

 

Step 5: During the operation of the centrifugal pump, you must "look at three things and listen at one time". Look at the pressure: fluctuation ≤10%, look at the temperature: bearing temperature ≤75℃, look at the leakage: leakage at the machine seal is ≤3 drops per minute, and listen to the abnormal sound: humming sound is normal, metal friction sound is dangerous!

 

Step 6: The shutdown sequence must be correct. First close the outlet valve (to prevent water hammer impact), then press the stop button, close the pressure gauge hand valve, wait until the pump temperature drops below 80 degrees before stopping the cooling water, and finally close the inlet valve as needed (if it is out of service for a long time), and drain the inside of the pump body.

 

Step 7: Winter special operation, when the ambient temperature is less than 5℃: the water in the centrifugal pump should be drained in time to prevent freezing and cracking, and then low-temperature grease should be added to the bearings

 

II: 5 taboos during the operation of centrifugal pumps

1: No idling must not exceed 30 seconds, and the centrifugal pump body should be affixed with a "No idling" label and a dry-running protector

 

2: Do not use the valve to "hold pressure" to adjust the flow, which will seriously cause the motor to overload and burn out. If there is a need for adjustment, the centrifugal pump variable frequency motor or cutting impeller should be replaced

 

3: Pumping liquid containing particles without a filter can easily break the impeller and incur high replacement costs

 

4: The centrifugal pump directly pumps high-temperature liquid. During the use of the centrifugal pump, the temperature difference of ＞50℃ will explode the seal, and it is generally preheated in advance (temperature rise ≤3℃ per minute)

 

5: Maintenance under pressure, this illegal operation is expressly prohibited, and the correct operation should be shutdown → pressure relief → hang up → double confirmation

 

III. FAQ

Question 1: No water after starting?

- Check 1: Is the centrifugal pump filled with water? (Re-exhaust)

- Check 2: Is the inlet valve blocked? (Disassemble and check)

- Check 3: Is the motor reversed? (Change the line sequence)

 

Question 2: Sudden large vibration during operation?

Possible causes:

1. Impeller blocked (stop and clean)

2. Loose anchor bolts (tighten diagonally)

3.Bearing wear (locate the abnormal sound point with a stethoscope)

 

Question 3: Severe water leakage at the seal?

- Temporary treatment: tap the sealing gland lightly (adjust the gap)

- Fundamental solution: replace the mechanical seal

(Practical dry goods that ordinary people can understand)

Why is your chemical pump always "unsuitable"? The high-performance "centrifugal pump" bought for 150,000 yuan leaked and stopped working in less than 3 months? The repair cost was 80,000 yuan. What's the problem? Is it really the quality of the manufacturer? It's not necessarily the case. It is very likely that the problem is in the selection process. The parameters of the chemical pump and the actual working conditions are "incompatible". Choosing the wrong model of chemical pump will waste money at best and cause safety accidents at worst!

 

 

Misunderstanding 1: Only look at the flow and head, and ignore everything else

 

 

 

Many users often rely on experience to estimate the flow and head of chemical pumps, but if they do not fully consider the actual situation, it may affect the matching of pump performance. For example, in the case of high-viscosity liquids, the starting torque requirement is high. If the power is not adjusted in time during selection, it may cause motor overload or pump damage.

 

 

When choosing a chemical pump, you must ask these questions:

- Medium composition (solid content? Corrosive? Flammable and explosive? Acid, alkali, salt, toxic and sticky, ask everything)

- Working temperature (normal temperature? High temperature? Low temperature? Low temperature needs insulation, high temperature prevents cavitation)

- Flow rate and head (through actual measurement or calculation with professional software, ensure that the performance curve of the pump matches the actual working conditions)

- Running time (continuous operation or intermittent use?)

- Installation environment (indoor? Outdoor? Explosion-proof area?)

 

 

Misunderstanding 2: Not fully considering pipeline pressure drop and other technical parameters:

 

 

Because of the mismatch of pipelines, the actual performance of chemical pumps is not as expected. In addition to the chemical pumps themselves, you should also pay attention to the length, diameter, pressure drop, etc. of the pipeline when selecting to ensure a comprehensive selection.

 

 

Misunderstanding 3: Ignoring daily maintenance costs

 

 

 

 

You will understand after doing the math:

 

 

 

While considering the initial investment, you also need to consider the later maintenance and operation costs of the equipment. You need to comprehensively evaluate the costs before and after, and choose a chemical pump with high cost performance.

 

 

Misunderstanding 4: Not paying attention to the details of chemical pump selection

 

 

 

The last thing to consider is the energy consumption requirements under environmental protection. Exceeding the energy consumption standard is not allowed in some areas, so the product must meet the latest GB 19762 energy efficiency standard. Secondly, when the chemical pump is repaired, can the manufacturer provide a 10-year spare parts supply commitment? If there is a need for transformation, can it adapt to the factory's intelligent transformation needs (such as adding sensors)? How long is the warranty period? How long is the delivery period? What should I do if the performance does not meet the standard? These questions must be confirmed with the manufacturer one by one

 

 

According to the above methods, the selection misunderstandings of chemical pumps can basically be avoided.

As the "liquid porter" in the industrial field, centrifugal pumps are responsible for more than 70% of the world's fluid transportation tasks. From waterworks to petroleum refining, this rotating machinery's impellers spin thousands of times per minute, creating astonishing industrial efficiencies. This article will disassemble the advantages and disadvantages of centrifugal pumps in plain language, and attach a practical selection parameter table and a guide to avoid pitfalls.

 

1. Advantages of centrifugal pumps

1. Simple structure:

The centrifugal pump has only 6 main components: impeller, pump body, shaft, bearing, seal, coupling, simple structure, few failures, durable, and low manufacturing and later maintenance costs.

 

2. Uniform flow

The flow and pressure of the centrifugal pump are stable, and the operation is smooth, which is very important for use scenarios that require stable flow output.

 

3. High efficiency

The efficiency curve is parabolic: the best efficiency point (BEP) can reach 92%. The efficiency of the centrifugal pump is much higher than other types of pumps, which can reach more than 50%, which can save a lot of energy.

 

4. Wide range of applications

According to the structure: single-stage/multi-stage, single-suction/double-suction

According to the medium: corrosion-resistant pump, impurity pump, high-temperature pump

According to the installation: vertical, horizontal, pipeline

Centrifugal pumps can transport a variety of liquids such as clean water, sewage, seawater, oil and chemicals, and are widely used in municipal engineering, agricultural irrigation, industrial production, ships and other fields.

 

5. Stable flow and easy adjustment

Centrifugal pumps can work stably in a wide flow range, and the flow can be easily adjusted by adjusting the speed, impeller diameter or changing the opening of the pump outlet valve.

 

2. Disadvantages of centrifugal pumps

1. Before running the centrifugal pump, the pump must be filled with liquid, because if the centrifugal pump runs dry for 5 minutes, the life of the bearing will be reduced by 80%, greatly increasing the failure rate of the centrifugal pump.

 

2. Centrifugal pumps are sensitive to cavitation, which causes damage to the impeller. Cavitation must be prevented during use. The required NPSHr is 3-5 times higher than that of the positive displacement pump!

Anti-cavitation formula:

Actual NPSHHa = atmospheric pressure (10.33m) - vaporization pressure - suction line loss - installation height

Safety criteria: NPSHa ≥ NPSHr + 0.5m

 

3. Centrifugal pumps are sensitive to high-viscosity liquids. The higher the viscosity, the lower the efficiency and performance. They are not suitable for high-viscosity fluids and need to choose other types of pumps (such as screw pumps, gear pumps, etc.).

4. The head of a centrifugal pump is greatly affected by the flow rate. When the flow rate deviates from the design, the head will drop significantly.

 

III. Comparison table of centrifugal pump selection parameters

Centrifugal pumps are like "panacea" in the industrial field. Their universal advantages coexist with the defects of working condition sensitivity. Therefore, detailed working condition simulation must be carried out when purchasing. For special medium transportation, the "centrifugal pump +" combination solution can be considered. It is recommended to ask the manufacturer to recommend a suitable centrifugal pump combination solution.

 

Magnetic pumps, also known as magnetic drive pumps, are widely used in chemical, pharmaceutical, electroplating and other industrial fields. With its "zero leakage" design, it has become a star equipment for high-risk media transportation. This article introduces the advantages and disadvantages of magnetic pumps in detail to solve customers' purchase questions!

 

1. Advantages of magnetic pumps

1. "Zero leakage" design

The magnetic pump completely eliminates the traditional mechanical seal structure and uses a permanent magnetic coupling to achieve power transmission. Its core advantage is that it is particularly suitable for conveying highly corrosive, flammable, and explosive media.

 

2. Low operating cost

The magnetic pump uses a permanent magnetic structure, there is no contact and friction, the power consumption is small, and the energy consumption is reduced by 20-35%. Under the premise of the working conditions, it can significantly reduce the operating cost.

3. Long service life

Because the magnetic pump has no mechanical friction design, the bearing life is extended by 3-5 times, and the overall service life will be longer.

 

4. Excellent corrosion resistance

Optional materials include:

- Hastelloy C276 (resistant to 98% concentrated sulfuric acid)

- Polytetrafluoroethylene lining (resistant to hydrofluoric acid)

- Silicon carbide sealing surface (resistant to strong alkali)

 

II. Disadvantages of magnetic pumps

1. High initial investment cost. Due to the cost of accessories, the price of magnetic pumps is generally 2-3 times that of ordinary centrifugal pumps

 

2. Medium and temperature adaptability restrictions. Magnetic pumps should pay attention to the following on the medium: solid particle content must be less than 0.1%, viscosity must be less than 500cP, and the temperature range is -20℃～250℃ (special design can reach 350℃)

 

3. Low efficiency. Due to the limited size of impellers that can be used for magnetic pumps, the flow rate of magnetic pumps is usually lower than that of traditional centrifugal pumps, resulting in relatively low efficiency.

 

4. The magnetic pump and the motor are connected by a coupling. The coupling requires high precision in alignment. Improper alignment will cause damage to the bearing at the inlet and wear of the single-sided leakage prevention isolation sleeve.

 

3. Comparison table of key selection parameters

The "zero leakage" advantage of magnetic pumps in terms of safety and environmental protection makes them standard equipment for modern chemical production. Although the initial investment of magnetic pumps is relatively high, the comprehensive benefits brought by magnetic pumps are still very significant through the cost analysis of the entire life cycle such as environmental protection, safety, and energy saving. It is recommended that manufacturers select pumps reasonably according to actual working conditions when purchasing.