Views: 0 Author: Site Editor Publish Time: 2026-07-23 Origin: Site
In industries such as metallurgy, petrochemicals, shipbuilding, and papermaking, the dynamic connection of fluid media between rigid pipes has always been a technical challenge - the pipes need to swing back and forth within a certain range or rotate at a low speed, but the traditional hard connection method cannot meet this requirement. The DN flange rotary joint (also known as DN type rotary joint, universal rotary joint) is a professional product specifically designed to address this pain point. It establishes a flexible movable joint between rigid pipes through a precise rotary sealing structure, allowing the fluid media to be stably transmitted during the reciprocating or rotating movement of the pipes.
I. Product Overview: A professional connection solution for large-diameter pipeline systems
The DN flange rotary joint is a rotary joint specifically designed for the dynamic connection of fluid media between rigid pipes, enabling reciprocating swing or low-speed rotational movements of the pipes. The product is connected by flange, and it supports pipe systems with diameters ranging from DN25 to DN400 and even larger. The material options include carbon steel, stainless steel (304/316L), etc., and the connection methods include straight-through connection of both flanges, welding at both ends, and bending at both ends, among others. Whether it is water, air, hydraulic oil, coolant, steam, smoke, or sewage and other media, the DN flange rotary joint can handle them all.
II. Core Technical Advantages
1.Precise bearings provide support, ensuring smooth operation without any oscillation.
The interior of the product is equipped with two rows of precision-grade steel balls or high-precision bearings as the core support. It operates smoothly without any wobbling, rotates flexibly and has strong support capacity. This structural design enables the product to maintain excellent motion characteristics in both reciprocating swinging and low-speed rotating conditions.
2. Long-life and maintenance-free design
The interior of the bearing is pre-filled with imported bearing lubricating grease, which can last for 3 to 5 years without maintenance. The rotating shaft has been specially treated (such as QPQ surface treatment), featuring excellent wear resistance and corrosion resistance. The mature product structure design ensures good stability and requires no frequent daily maintenance.
3. Reliable sealing performance
The sealing components are made of imported sealing materials (such as those from Parker in the United States), ensuring reliable sealing performance. Some products can withstand a maximum pressure of 30 MPa and have a long service life. Additionally, the products are made of special rubber materials, which not only guarantee reliable sealing but also can withstand high-temperature conditions.
4. High wear resistance and strong supporting capacity
The product has high wear resistance, flexible rotation and strong support capacity. The internal part is directly supported by balls, resulting in excellent rotational performance and superior wear resistance of the raceway. The overall QPQ surface treatment further enhances the product's resistance to wear and corrosion.
5. Flexible custom production capabilities
The pipe diameter range covers from 20mm to 800mm, and it supports various connection methods such as straight-through connection with both ends flanges, welding connection at both ends, and connection with both ends as a bend. Customized services can be provided according to customer needs, including special materials, special pipe diameters, and special connection forms.
III. Typical Application Scenarios
Metallurgical industry: Widely used in equipment such as converters, heating furnaces, and continuous casting machines, for the transmission of media such as cooling water, exhaust gas, and steam.
Petroleum industry: Suitable for pipeline connections of fluid media such as oil and chemicals
Shipbuilding industry: For the transmission of fluid media in ship piping systems
Paper-making industry: Suitable for the transmission of steam, hot water, etc. for paper-making equipment
Mining, building materials, chemical industry, mechanical processing: Widely applicable for fluid medium connection activities between various rigid pipes
IV. Key Points for Selection and Installation
When making the selection, it is necessary to clearly define the following key parameters based on the actual working conditions:
Flowing media: water, air, steam, hydraulic oil, exhaust gas, sewage, etc.
Work pressure: For regular products, it can reach 4.0 to 10 MPa; for high-pressure customized models, it can reach 25 to 45 MPa.
Operating temperature: Normal range -30℃ to 220℃, for high-temperature models, it can reach 350℃
Bore specification: DN20 to DN800. Choose according to the nominal diameter of the pipeline.
Connection method: Direct connection with flanges at both ends, welding at both ends, or with elbows at both ends.
When installing, please pay attention to the following points:
Before installation, clean the impurities inside the pipeline with compressed air. No iron filings or other impurities should be left behind.
When making a flange connection, a uniform thick and thin copper gasket should be placed on the stop step at the shaft end.
For the mating parts and the screw holes, fix them with bolts. Tighten them at opposite angles with the same torque.
When the medium is steam or heat-conducting oil, the connection points need to be coated with high-temperature sealant before installation.
During the installation process, the joints must not be struck or collided with to avoid damaging the sealing components.
V. Why Choose a Professional Manufacturer
Shandong Focus Machinery Co., Ltd. is a manufacturer specializing in rotary joints. It has accumulated profound technical expertise in this field. The products adopt advanced technology, and all of them use high-quality components. They undergo strict inspections before leaving the factory. The products are resistant to corrosion, high temperature, and high pressure. It can provide non-standard customization services to meet the needs of various special working conditions. The delivery cycle is short, and it supports various logistics methods such as sea transportation, air transportation, high-speed rail transportation, and land transportation. A complete after-sales service system ensures that customers can buy with peace of mind and use with confidence.
The DN flange rotary joint (large-diameter rotary joint) may seem like a simple pipe connection component, but it is a crucial part for achieving reciprocating oscillation and low-speed rotational movements in rigid piping systems. Choosing a product with reliable support, excellent sealing performance, and durability is not only essential for ensuring the continuous and stable operation of the production line and significantly reducing maintenance costs, but also provides a safeguard for your industrial production.
If you would like to know more about the product details or obtain selection suggestions, please feel free to contact me.
