In today’s global lifting and rigging industry, safety, durability, and compliance are more important than ever. At NANJING D.L.T SLING CO., LTD, we are proud to be one of China’s leading manufacturers of high-quality synthetic lifting slings and tie-down systems. With a strong focus on safety standards, innovation, and customer satisfaction, we have become a trusted supplier to clients across Europe, North America, Southeast Asia, and beyond.

Our Core Products

We specialize in the production of a wide range of lifting and securing products, including:

• Webbing slings (flat webbing slings in double-ply or single-ply)

• Round slings (including ultra heavy-duty slings with capacities up to 1100T)

• High-performance fiber slings (e.g., UHMWPE slings)

• Ratchet tie-down straps and lashing systems

• Lifting nets, tow straps, and more

All products are manufactured with precision using premium materials such as high-strength polyester or UHMWPE, ensuring both strength and longevity under heavy workloads.

Certified for Safety and Quality

At D.L.T, we understand that our customers demand more than just a product — they demand trust. That's why our factory adheres to strict international standards, including EN1492-1/2, EN12195-2, and ASME B30.9, and we hold CE and GS certifications for many of our items. Our slings are designed with safety factors such as 7:1 or 5:1, and each item is carefully inspected before shipment.

Customization & Private Labeling

We know that every client has unique needs. We offer:

• Custom lengths and widths

• Customer logos on labels or webbing

• OEM/ODM services for long-term partners

Our products are widely used in industries such as logistics, construction, shipyards, and heavy machinery.

Global Reach with Local Service

With years of export experience and a multilingual sales team, we’ve established long-term partnerships with clients in France, Germany, Canada, Australia, Indonesia, and many other countries. Whether you're a distributor, importer, or industrial end-user, we’re here to support your business with professional service and fast delivery.

Are You Looking for a Reliable Sling Supplier from China?

We welcome you to contact us for samples, quotations, or custom orders. Let us help you lift your business — safely and efficiently.

📧 Email: sales@dlt-sling.com
🌐 Website: www.dlt-sling.com

If the pump outlet is reduced in size, what will be the consequences?  

Among the customers of Anhui Shengshi Datang, the purchase of chemical centrifugal pumps and metal magnetic drive pumps is quite common. However, some clients frequently provide incorrect specifications. When it comes to on-site installation, they discover the discrepancies and assume that minor adjustments will make the pumps usable—but this is not the case.

If a 1-inch pump outlet is fitted with an adapter to reduce it to 8 points (a smaller diameter), will this have any impact on the pump? Can reducing the outlet size achieve a throttling effect? Will increasing the outlet size result in higher head pressure?  

First, it’s important to understand one key point: every pump has its fixed performance parameters. Whether the pump outlet is enlarged or reduced, the head pressure will neither increase nor decrease.  

When the pump outlet is reduced in size, the outlet pressure will increase, but the pump’s parameters remain unchanged. If the pump outlet is enlarged, the pump can only operate up to its maximum parameter limits. Changing the outlet size is a manual adjustment and does not alter the pump’s inherent performance.  

Now, let’s discuss the potential impacts of reducing the pump outlet size:  

01 Reducing the pump outlet size is equivalent to partially closing the outlet valve. This increases the pump pressure and reduces the flow rate. The current draw of the pump may decrease slightly, but if the pump experiences vibration, the vibration will not diminish—it might even worsen.  

02 Reducing the outlet size does not change the pump’s head pressure. However, if external conditions change, it may affect the pump’s overall performance, potentially leading to higher outlet pressure. This change is dynamic, meaning that reducing the outlet size can act as a throttle, increasing the outlet pressure.  

03 If the operating conditions are not ideal, reducing the outlet size may shorten the pump’s service life. But if the pump operates normally after the adjustment, there is no need for concern.  

04 As long as the reduction in outlet size is not excessive, it should not cause major issues. However, if the reduction is too significant, it may impede water flow, increasing pressure on the pump and overloading the motor.  

05 Changes in the pump outlet size directly affect the flow rate, as industry professionals know. A larger outlet increases the flow rate, while a smaller outlet decreases it.

When adjusting the size of the pump outlet, it is important to consider the performance curve of the pump, the reduction of system resistance and dynamic flow rate, which leads to the diameter of the fluid velocity distribution, resulting in higher resistance and losses, and may change the operating point curve of the pump. Due to the potential throttling effect, the pump's head or maximum efficiency point will not change.

For chemical pumps and metal magnetic device pumps, improper filtration may result in frequency, vibration, or overheating, especially in high viscosity or corrosive fluid applications. In order to maximize performance, it always maintains consistency with hydraulic calculations, pump socket dimensions, pipe diameters, and system requirements.

We, Anhui Shengshi Datang, are willing to communicate and exchange professional technology related to pumps with everyone. Welcome everyone to discuss, and feel free to ask any questions about selection.

Key Differences Between Magnetic Drive Pumps, Centrifugal Pumps, Process Pumps, and Axial Flow Pumps​​

Anhui Shengshi Datang possesses mature design technology and manufacturing capabilities, providing customers with professional technical support and services to create high-performance, reliable equipment of exceptional quality.

When selecting industrial pumps for fluid transfer applications, understanding the differences between magnetic drive pumps, centrifugal pumps, chemical process pumps, and axial flow pumps is crucial. Magnetic drive pumps use non-contact magnetic coupling to eliminate leaks completely, making them ideal for hazardous, toxic, or corrosive fluids—though they have slightly lower efficiency. Centrifugal pumps are simple, reliable, and cost-effective, best suited for medium-to-high flow rates with low-to-medium head pressure in water supply and HVAC systems. Chemical process pumps are engineered for harsh environments, featuring corrosion-resistant materials to handle acids, alkalis, and high-temperature fluids with superior sealing. Axial flow pumps specialize in high-volume, low-pressure applications like flood control, irrigation, and cooling water circulation.

For optimal performance, consider fluid properties, flow requirements, and sealing needs: choose magnetic pumps for leak-proof operation, centrifugal pumps for general water transfer, process pumps for aggressive chemicals, and axial pumps for large-scale liquid movement. This guide helps ensure safe, efficient, and cost-effective pump selection.

No Leakage vs. Stainless Steel Submersible Pumps: Key Differences

Anhui Shengshi Datang Chemical Equipment Group manufactures a series of magnetic drive pumps and submersible pumps, backed by a professional team and advanced technology. We welcome you to choose us.

When handling corrosive liquids, choosing between a No Leakage Anti-Corrosion Submersible Magnetic Drive Pump and a Stainless Steel Corrosion-Resistant Submersible Pump depends on chemical resistance, durability, and application needs.

No Leakage Magnetic Drive Pump

1.100% leak-proof (no mechanical seal, magnetic coupling)

2.Best for harsh chemicals (PP/PVDF/ETFE construction resists strong acids/alkalis)

3.Low maintenance (fewer moving parts)

Ideal for: Chemical processing, electroplating, semiconductor industries

Stainless Steel Submersible Pump

1.High durability (304/316 stainless steel resists rust & mild chemicals)

2.Handles heat & abrasives (better for hot liquids, slurries, and oils)

3.More affordable but needs occasional seal maintenance

Ideal for: Food processing, marine, oil/gas, industrial drainage

Which One to Choose?

1.Magnetic Drive Pump–Zero leakage, extreme chemical resistance

2.Stainless Steel Pump–Heavy-duty, cost-effective for high temps/abrasion

Need the best corrosion-resistant pump? Contact us for expert recommendations!

Applications of Chemical Pumps

Here is an introduction to the application of chemical pumps. For further details or quotations regarding magnetic drive pumps and centrifugal pumps, please contact Anhui Shengshi Datang.

Chemical pumps are designed to remove crematory liquids from bottles, barrels, tanks or other containers and are widely used in industries such as chemical processing, petroleum, metallurgy, light industry, synthetic fibers, environmental protection, food and pharmaceutical products. These pumps play a crucial role, due to their stable performance, reliable seals, aesthetic design and easy maintenance, to improve product quality, minimize leakage, prevent pollution and improve environmental conditions. They are suitable for the transport of crematory or highly reactive media at different temperatures in sectors such as power plants, pharmaceuticals and the production of synthetic fibres.

Different types of glass fiber chemical pumps are available, such as corrosion resistant pumps, high temperature pumps, standard chemical process pumps and magnetic drive pumps. Chemical pumps are also widespread in water supply, heating, air conditioning, cooling and operating systems, fire protection, irrigation and rainwater. They are ideal for residential, industrial, horticultural and agricultural applications, especially for increasing pressure in environments with lower noise and piping, even corrosive, explosive or particulate.

As a trusted lobe pump manufacturer, we understand that efficiency, reliability, and product integrity are non-negotiable for your operations. Whether you’re in food & beverage, pharmaceuticals, chemicals, or wastewater treatment, our (BONVE) lobe pumps are engineered to address critical pain points while delivering standout performance. Here’s how they make a difference:

Core Advantages of Our Rotary Lobe Pumps

Gentle, Non-Destructive Fluid Handling

Unlike centrifugal or gear pumps that can shear, agitate, or damage sensitive fluids, Bonve lobe pumps use two non-contact lobes to create a smooth, low-pulse flow. This design preserves the integrity offragile media—think yogurt with fruit pieces, pharmaceutical slurries, or viscous creams. No more broken particles, separated emulsions, or compromised product quality.

Versatility Across Fluids and Viscosities

From thin liquids (like water or oils) to highly viscous materials (such as adhesives, pastes, or sludge) and even fluids with solids (e.g., wastewater with debris or food batters with chunks), our pumps handle it all. They adapt to varying viscosities without losing efficiency, eliminating the need for multiple pump types in your facility.

Self-Priming and Dry-Run Capable

Bonve lobe pumps excel at self-priming, meaning they can start pumping from a dry state and pull fluid from below-tank levels—no manual priming required. They’re also designed to withstand short dry runs without damage, reducing the risk of breakdowns if lines run empty unexpectedly.

Easy Maintenance and Hygienic Design

For industries like food and pharmaceuticals, hygiene is critical. Our pumps feature aclean-in-place (CIP)andsterilize-in-place (SIP)compatible design, with smooth surfaces, minimal dead zones, and quick-disconnect components. This cuts down on cleaning time, reduces downtime, and ensures compliance with strict regulatory standards (e.g., FDA, EU 10/2011).

Consistent Performance Under Pressure

Problems Solved: Real-World Impact

Whether you’re looking to protect product quality, streamline operations, or reduce costs, our rotary lobe pumps are built to solve your toughest challenges. Let’s connect to discuss how we can tailor a solution for your specific needs.

When it comes to livestock production, the health of the animals themselves, and the environmental problems of the sheds must be of the greatest concern. Many owners of animal husbandry are very surprised: "The same livestock, the same shed, the same feed, why our livestock morbidity is higher than others, production capacity is not as good as others?"

And next, Let us see what are the main reasons? And how to solve them.

 Livestock temperature 

The enclosure of the shed is better. This ensures the stability of the whole house environment. It will also be due to poor ventilation, leading to the heat in the house is not easy to emit, and then the temperature in the house is too high. Poor closure of the shed, ventilation is very good, but the winter temperature is low, will also lead to the house temperature is too low. The house temperature is too high or too low, will seriously affect the performance of livestock production.

The air humidity in the house is too high, the airflow speed is too fast, and the illumination is too little, which will lead to the temperature reduction. In turn, the air temperature is also too high, which reduces the productivity of livestock.

 Dust and microbes 

Due to the excretion of livestock itself, it will lead to the breeding of microorganisms, dust and bacteria. If the air circulation in the house is poor, microbes, dust, bacteria continue to accumulate, it will affect the health of livestock. Such as foot and mouth disease, influenza, panting and so on. This leads directly to reduced productivity and even death of livestock.

 Harmful gas 

Livestock respiration, excretion and decomposition of organic matter will lead to the appearance of harmful gases. Therefore, there is a great difference in the composition of the air inside and outside the house. Excessive accumulation of harmful gases can also directly affect the health of livestock, resulting in reduced productivity, and even death.

 Now that we know these reasons, how can we solve the above problems?

Because the main thing is to improve the air environment in the shed, it is necessary to install ventilation system in the barn, in order to stabilize the air temperature in the barn. Through stable airflow, dust, microbes, bacteria and toxic gases will be brought out of the house, and fresh air outside the house will be introduced to balance the air quality inside the house.

Taking the pig farm as an example, we put forward the following ventilation methods to improve the air environment and the production capacity of the pig farm by combining various elements such as the season, the difference between male and female pigs and the actual pig farm environment:

 Negative pressure ventilation filtration 

Negative pressure ventilation is to install the main filter wall at the front end of the cooling water curtain, and install the ceiling filter box on the ceiling ventilation window.

In winter, fresh air enters the ceiling through the top ventilation window, filters through the ceiling filtration system and enters the pigsty, and exhaust gas is discharged by the fan.

In summer, fresh air enters the barn only after being filtered by the main filter wall, and exhaust gas is discharged by the fan. There is negative pressure inside the piggery.

◆The negative pressure ventilation filter requires large area, low replacement frequency, low ventilation energy consumption, and strong regional applicability.

 Positive pressure ventilation filtration 

The main filtration wall is installed in the filtration room. The positive pressure fan is installed in front of the main filter wall. Fresh air enters through the filter screen and enters the main filter wall under the action of the fan.

In winter, the filtered air enters the ceiling through the ceiling ventilation window and enters the pigsty through the ceiling small window.

In summer, the filtered air passes through a wet curtain and enters the piggery. Exhaust gases are removed by shutters and the air pressure inside the house is higher than outside.

◆ There is less risk of unfiltered air entering the house, which is the advantage of positive pressure ventilation. But higher fan power is the guarantee of reliable operation of positive pressure ventilation. The selected fan must be able to provide sufficient air volume under high static pressure difference.

 Balanced ventilation or micro-positive pressure ventilation 

Neutral ventilation is between negative pressure ventilation and positive pressure ventilation, and generally adopts a partial positive pressure way. Mainly used in boar station. Neutral ventilation combines the advantages of positive pressure ventilation and negative pressure ventilation. The front end is positive pressure inlet air and the back end is negative pressure exhaust air, forming an orderly ventilation flow direction. But relatively speaking, the investment is higher, the operating cost is better.

So, how to choose the appropriate filtration ventilation scheme?

◆ The choice of filtration ventilation scheme depends on the air cleanliness level L6 or L9 of the pig farm and the location of the pig farm;

Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.

The negative pressure ventilation filtration design is recommended for thermal emergency sensitive areas and pig breeds. Ensure good ventilation effect and low energy consumption to meet the actual production needs.

 There are the following points to pay attention to in the use of air filtration system: 

1) Before the piggery air filtration system is put into use, it is necessary to test the air tightness of the piggery, the installation of the filter and the airflow pattern in winter and summer to ensure the operation effect of the system.

2) If the system of the unit is not used, there should be detailed operation guidance for filter replacement.

3) When to replace the filter is also an issue we need to consider. The best scheme is to decide whether to replace the filter according to the pressure transformation of each layer (positive pressure air filter unit can be realized). However, many systems do not test the static pressure difference, and filters can be used to change according to the cycle.

In air conditioning systems for cleanrooms and other high-cleanliness environments, fan filter units (FFUs) are one of the core devices for achieving air cleanliness control. FFUs ensure the purity and uniform distribution of indoor air through their efficient air filtration capabilities and stable airflow organization, and work together with dry coils (DCs) and other components to maintain the environmental conditions of cleanrooms.

 High-efficiency air filtration and airflow organization 

FFUs have built-in high-efficiency filters that can remove particles in the air, including dust, bacteria, and viruses, to ensure that the air delivered to the cleanroom meets high cleanliness standards.

At the same time, FFUs form stable vertical laminar or turbulent airflow organizations through the operation of their built-in fans to avoid local contamination. This stable airflow organization is essential for maintaining the cleanliness of cleanrooms, especially in the semiconductor manufacturing and biopharmaceutical fields where cleanliness requirements are extremely high.

 Collaborative work and application scenarios 

In dry coil systems, FFUs work together with dry coils (DCs) and other components (such as fresh air units MAUs). MAU is responsible for introducing and processing outdoor fresh air, removing particulate matter through primary and medium efficiency filtration, and processing the fresh air to the specified temperature and humidity.

The fresh air treated by MAU is mixed with part of the return air, filtered by FFU and sent to the clean room. After the indoor air is cooled or heated by the dry coil, it is circulated to the return air channel again and mixed with the supplementary fresh air to form a closed-loop air circulation system.

FFU runs continuously to maintain the number of air cycles and ensure the cleanliness of the indoor air; the dry coil adjusts the cold water flow or temperature according to the temperature sensor, and only processes the sensible heat load to avoid mutual interference in temperature and humidity control. This design with clear division of labor improves the overall performance and reliability of the system.

Among the many FFU products, KLC FFU is an excellent choice in the market with its excellent performance and flexible design. KLC FFU uses high-efficiency filters with KLC's exclusive technology, which can achieve high-efficiency air filtration and ensure high cleanliness of indoor air.

Its compact design is easy to install and maintain, and it has the characteristics of low noise and high energy efficiency, which can meet the requirements of different cleanliness levels.

KLC FFU also has flexible installation methods and intelligent control options, which can realize single-unit manual control or multi-unit group monitoring, and can adapt to the needs of clean room applications from small to large scale.

KLC FFU performs well in practical applications, especially in the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, providing users with efficient and reliable air purification solutions. Its efficient filtering performance and stable airflow organization ability can effectively prevent condensed water from contaminating wafers, ensure the sterile environment of drug production, and ensure the accuracy and stability of the equipment.

KLC FFU's low noise operation and high energy efficiency design also make it perform well in clean rooms with strict environmental requirements, providing users with an ideal air filtration option.

As the core air filtration equipment in the dry coil system, FFU provides a reliable solution for high-cleanliness environments such as clean rooms through its efficient filtering capacity and stable airflow organization. Its collaborative work with dry coils and other components further optimizes the performance and reliability of the system.

In the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, FFU has become a key equipment for maintaining a high-cleanliness environment to ensure the efficient and stable operation of the production process.

High-efficiency air outlets are ideal terminal filtration devices, widely used in medicine, health, electronics, chemicals and other industries. In order to verify whether the clean room can meet the cleanliness requirements, it is necessary to test the clean room and high-efficiency air outlets, so its detection is very important.

 How to measure the air volume of high-efficiency air outlets: 

1. You can use the air volume hood to directly aim at the nozzle for one-time measurement, direct measurement. Since your nozzle has many small holes (to make the air volume uniform) and there is a grille, then your anemometer can be kept 3-5 cm away from the nozzle. If you have a thermal anemometer, try to face the gap instead of the grille, and measure the average value by the grid method. The same cross-section can be measured.

2. You can measure at multiple points at a distance of 2 times the width of the diffuser from the air outlet. The measuring points should be like a grid and then the wind speed is averaged. The sizes of these vents are similar. Use tinplate or even plastic board to make a barrel that is slightly larger than the cross-section of the air outlet. When measuring, cover the barrel on the air outlet and use the anemometer to measure the nozzle of the barrel at multiple points and then calculate the average value.

3. Through the clean air conditioning circulation fan, through the high-efficiency air filter, medium-efficiency filter, and primary air filter, clean air can be obtained. The cleanliness is different and the wind flow direction is different. Of course, it is also necessary to supplement some fresh air through the fresh air outlet, otherwise people will feel stuffy inside.

 Air volume measurement of high-efficiency air outlet: 

1. The detection method of high-efficiency air outlet uses active sampling and passive sampling. Active sampling uses filtering method and impact method. Filtration method allows a certain amount of air to pass through an analytical filter.

2. The impact method can use Anderson sampler, Lute centrifugal sampler, and slit sampler. Passive sampling uses the landing method. Use the principle of diffusion of the open agar plate of suspended particles.

3. Of course, with the development of science and technology today, some more sophisticated detection instruments can also be used to quickly detect it.

SEMICON SEA, the annual event of the global semiconductor industry, has come to a successful conclusion at the Marina Bay Sands Convention and Exhibition Center in Singapore. As the largest and most influential semiconductor exhibition in Southeast Asia, it brings together semiconductor equipment, materials and service suppliers from all over the world. Here, practitioners in the semiconductor market of various countries have obtained the most complete face-to-face technical exchange and cooperation platform to jointly explore new concepts, new trends and development space in the industry, and also create an excellent opportunity for enterprises to explore and develop the Southeast Asian market.

KLC brought a full range of air purification system solutions and other series of air filters and clean room equipment to the SEMICON SEA exhibition stage, winning the favor of partners from all over the world.

The exhibition is scheduled, and cooperation is boundless. In the future, KLC will continue to use "technological innovation" as the engine, constantly polish, and strive to provide more efficient and sustainable air purification system solutions for global customers. KLC SEMICON SEA 2025 has come to a successful conclusion. Thank you to everyone who pays attention to KLC. We will continue to work hard to contribute more to the air purification of the semiconductor industry!