QUALITY Single Sphere Rubber Expansion Joint & Threaded Expansion Joint FACTORY

In today’s competitive industrial landscape, choosing the right supplier is critical to ensuring operational efficiency, product reliability, and long-term success. At JINGNING, a leading manufacturer of rubber and metal expansion joints, we pride ourselves on embodying the qualities that define a truly exceptional supplier. Here’s what we believe sets us apart: 1. Uncompromising Quality Standards A great supplier starts with quality. Our expansion joints are crafted using premium-grade materials—from high-performance elastomers to corrosion-resistant metals—ensuring durability under extreme pressure, temperature, and chemical exposure. Every product undergoes rigorous testing (including pressure, fatigue, and leak tests) to meet ISO 9001 and PED certifications, guaranteeing compliance with global standards. 2. Technical Expertise & Customization No two projects are the same. Our engineering team collaborates closely with clients to design tailored solutions for pipelines, HVAC systems, or industrial machinery. Whether you need flanged rubber expansion joints for vibration damping or stainless steel metal joints for high-temperature applications, we deliver precision-engineered products that fit your exact specifications. 3. Agile Production & On-Time Delivery Time is money. With state-of-the-art manufacturing facilities and streamlined processes, we maintain short lead times without sacrificing quality. Our just-in-time production model ensures timely delivery, even for urgent orders, helping you avoid costly project delays. 4. Global Compliance & Certifications Trust is built on transparency. We adhere to international regulations (CE, ASME, ASTM, etc.) and provide comprehensive documentation, including material traceability reports and third-party inspection certificates. This commitment minimizes risks for your supply chain. 5. Responsive Customer Support A great supplier never stops at the sale. Our dedicated support team offers: 24/7 technical assistance for installation and troubleshooting. Proactive maintenance recommendations to extend product lifespan. Flexible logistics partnerships to optimize shipping costs. 6. Sustainability-Driven Manufacturing We prioritize eco-friendly practices, from reducing waste in production to offering energy-efficient expansion joint designs. Partner with us to meet your sustainability goals while maintaining peak performance. Why Choose JINGNING? With over 20 years of experience serving industries like oil & gas, power generation, and water treatment, we’ve built a reputation as a trusted partner for expansion joint solutions worldwide. Our clients rely on us not just for products, but for innovation, reliability, and a partnership that grows with their needs. Ready to Experience the Difference? Contact us today at sales@chnflex.com or visit chnflex.com to discuss your project requirements. Let’s engineer success together!

We are manufacturer specialized in rubber expansion joints. We’ve been supplying rubber expansion joints to Pump, Valve, Construction, Industrial companies for 20 years. Serving more than 200 companies. We’re a leading provider of high-quality rubber expansion joints for industrial and commercial applications. With years of experience in the industry, we have established ourselves as a trusted partner for clients seeking reliable and durable solutions for their piping systems. Basically, we help most of our customers to solve pipeline stress issues.   We can offer a comprehensive range of rubber expansion joints designed to accommodate various applications and operating conditions. We also offer custom-designed rubber expansion joints tailored to meet specific project requirements. In addition to our product offerings, we provide comprehensive support services, including technical assistance, installation guidance, and maintenance recommendations, to ensure optimal performance and longevity of our expansion joints.   CHNFLEX is your trusted partner for high-quality rubber expansion joints and exceptional customer service. With our extensive product range, technical expertise, and commitment to excellence, we are well-positioned to meet the diverse needs of our clients across various industries. Contact us today to learn more about how we can help you with your expansion joint requirements. Our mission is to deliver innovative, cost-effective, and sustainable rubber expansion joint solutions that exceed our customers' expectations. We are committed to providing exceptional quality, service, and value to our clients while maintaining the highest standards of integrity and professionalism.   1，Quality Assurance:At CHNFLEX， quality is our top priority. We adhere to strict quality control measures throughout the manufacturing process, from raw material selection to final product testing. 2，Customer Satisfaction: We are dedicated to customer satisfaction and strive to build long-term relationships with our clients based on trust, transparency, and mutual respect. 3，Our products are designed to be durable and long-lasting, contributing to resource conservation and waste reduction efforts. If you want to know more about our product, pls contact us on chnflex.com

ZTWB DC medium thrust free compensator: it is composed of reducer, inner sleeve, seal seat sleeve, flexible graphite packing, nuts and bolts. The advent of ztwb DC medium thrust free compensator is undoubtedly a breakthrough of thermal pipeline compensator products. It not only opens up a new field for the production of compensator, but more importantly, it not only solves the fatal weakness of working medium thrust in the pipeline, but also solves the disadvantages of bypass tube thrust free compensator, such as excessive stress concentration and large medium resistance. It is widely used in chemical industry, electric power, metallurgy, heat supply, temperature supply oil products, acid and alkali, liquid, gas and water pipelines. It is the most ideal pipeline expander at present.

There are many reasons that can cause the bursting of rubber expansion joint .Let’s check them one by one. Firstly, the pressure in the pipeline is too high. Generally, the maximum pressure of the rubber expansion joints can withstand is 2.0Mpa for PN10 rubber expansion joints. If the pressure is too high, high pressure resistant rubber expansion joints should be used. The working pressure can be 3.0MPa for a PN16 (4.5Mpa for PN25)rubber expansion joints. Therefore, the designer should design the rubber expansion joints with corresponding pressure to install.JINGNING rubber expansion joints are designed beyond the pressure standard. For example, our DN100 rubber expansion joints can work well at 8.0Mpa. Secondly,rubber expansion joints produced by inferior rubber materials may cause the bursting. Rubber expansion joints installed outdoors should be protected from high temperature, ozone oil and acid and alkali environments, and it is strictly prohibited to be exposed to rain, rain and wind. In this case, the rubber material should be good, such as: neoprene, EPDM, silicone rubber, fluorine rubber and other formulas. The use of good rubber can extend the life of the rubber.Our rubber formula is special designed and tested to suitable for the usage the rubber expansion joints. The other reason is a manufacturing process problem.Rubber expansion joints burst from the inner parts, especially from the crack caused by Mechanical mold.But we JINGNING use internal inflation（compress air) to process the inside of the rubber expansion joints.It won’t leave cracks on the rubber.In this way, we can avoid the bursting risks. May our JINGNING rubber expansion joints bring you more convenience and ensure safety connection of your pipeline.

Flange type metal corrugated compensator is an axial stainless steel corrugated compensator made of single-layer or multi-layer thin-walled metal tubes. When working, the corrugated deformation is used to compensate the heat in the tube. Most of the bellows used in heating tubes are made of stainless steel. Metal corrugated compensators can be basically divided into three types: axial, lateral and angular according to the displacement form. Each type has its own advantages and disadvantages. Therefore, in order to make the bellows compensator work normally and realize the economical and reasonable design and selection of the bellows compensator, a reasonable choice should be made according to different working conditions. The axial bellows compensator can absorb axial displacement and can be divided into internal pressure type and external pressure type according to its pressure bearing method; the transverse compensator can deform along the radial direction of the compensator and is usually installed on the horizontal pipe section in the pipeline. To absorb the thermal elongation of the axial displacement pipe. The angle compensator uses the flat angle of the bellows to absorb lateral displacement in one or more directions on the flat tube system. Need to install in pairs or three sets. The material thickness of the wave body of the flange-type metal corrugated compensator is mainly determined by the working pressure value, that is, the thickness of the wave body is calculated according to the pressure, and the wave body thickness is divided into single layer, double layer and three layers. The more layers, the thicker the thickness, and of course, the greater the working pressure. If the stiffness of the compensator is required, the total thickness of the compensator can be appropriately increased. Since the wave body material thickness of the compensator cannot be too thick or too thin, it is necessary to adjust the wave height and wall thickness to meet this requirement if necessary.

JINGNING-Specialized in rubber expansion joints!    JINGNING passed the test of CE,and got CE certificate for rubber expansion joints products. We will provide our customers best products with perfect service.

The force transmission joint is a new product connecting pumps, valves and other equipment with pipelines. They are connected with each other by full bolts to make them become a whole and have a certain amount of movement. In this way, it can be adjusted according to the on-site installation size during installation and maintenance, and the axial thrust can be transmitted back to the whole pipeline during operation. This not only improves the work efficiency, but also plays a certain protective role for pumps, valves and other equipment. The double flange loose sleeve force transmission joint is suitable for conveying sea water, fresh water, hot and cold water, drinking water, domestic sewage, crude oil, fuel oil, lubricating oil, product oil, air, gas, steam and granular powder with temperature not higher than 250 ℃. Therefore, the double flange loose sleeve force transmission joint is widely used in coal handling, pulverizing and ash discharge systems of thermal power generation and material conveying and batching systems in metallurgy, steel, cement and other industries. Such as outlet pipe of coal mill, inlet pipe of coarse and fine powder separator, elbow of primary air pipe, pulverized coal pipe, dust removal pipe, ash drop pipe, slag discharge pipe, limestone distributor, etc.

The sliding surface of bi-directional sleeve compensator is specially treated and has good corrosion resistance in salt water and salt solution, which is more than 50 times higher than that of austenitic stainless steel. At the same time, when the sealing effect is weakened due to wear after many years, the flange can be tightened again to enhance the sealing performance, or the bolt can be loosened, the pressure ring can be removed, and then one or two layers of sealing ring can be installed to compress the pressure ring and continue to use. The two-way sleeve compensator can prevent the damage caused by the sinking of the connected support or equipment foundation, adapt to the eccentric error of pipeline installation, and facilitate the installation and maintenance. Bidirectional sleeve compensator has the characteristics of positive and negative steam supply. It is not necessary to consider the flow direction of medium during installation; In addition to the large amount of compensation and quick and convenient installation of the original direct buried type, the compensator is more safe and reliable in use due to the use of the diversion tube with special structure. The compensator is mainly used for direct burial, trench or overhead. The two-way sleeve compensator has the advantages of reasonable structure, good elasticity, large range of thermal expansion and cold contraction of the compensation pipeline, small reaction force on the pipeline support, vibration absorption and dust isolation. Bidirectional sleeve compensator, also known as tubular expansion joint, is a compensation device for hot fluid pipeline, which is mainly used for auxiliary equipment of linear pipeline. It is suitable for hot water, steam, grease and other media. Through the sliding movement of the sliding sleeve, the thermal expansion compensation can be achieved.

The same pump failed again. A manufacturer experienced repeated failures on the same pump over and over, and even though the pump had been properly repaired, installed, and aligned, it still experienced chronic vibration issues. A closer look determined that the vibrations were not being emitted from the pump, instead it was being affected by vibrations from other equipment as it travelled along the pipes. What can be done to stop rogue vibrations from affecting the pump? A piping expansion joint might help. What is a piping expansion joint? An expansion joint is installed in piping systems for a couple of reasons. Not only can they be used to absorb vibrations and shock, they can also be used to relieve anchor stress, reduce noise, and compensate for misalignment. Certain expansion joints are also designed for thermal expansion in very hot applications. Expansion joints allow pipes to move in three different ways: Axial compression or extension Lateral offset Angular deflection They typically come in three different materials to cover a variety of applications. Metal – Metal expansion joints are mostly used in applications where thermal expansion is an issue. When the temperature of the pipe increases, the metal expansion joint compresses to compensate for the movement, taking stress off the anchors and the pipe. A metal expansion joint is a prime example of how to handle expanding hot pipes.   Rubber – Rubber can be used for thermal expansion, and it also absorbs vibration and shock waves extremely well. That’s why this type of expansion joint is great for minimizing the transmission of noise, vibration from other equipment to protect equipment like pumps. They also work as shock absorbers to minimize trauma caused by water hammer, pressure surges, and seismic events (not that we get a lot of earthquakes in Wisconsin…). Braided – Braided stainless hoses with flexible or metal liners aren't technically an expansion joint, more of a flexible connector. They work well in high pressure and temperature applications requiring vibration dampening or pipe misalignments. These are often used on pumps and other equipment to help eliminate thrust load on the equipment nozzles due to thermal expansion. Eliminating that load is critical to pump performance. Braids provide lateral an angular movement. They also absorb vibration rather well. Why would I need one? We described some of the big reasons why expansion joints are helpful in piping systems already, but just to recap: Thermal expansion of piping Solve initial piping misalignment and settlement lateral offsets Pump and equipment vibration Shock and bending loads Your entire process is intertwined, each piece affects the next. Having a reliable piping system is key to a process that maximizes uptime. Carefully managing your piping system not only keeps the pipes in great working condition, but also extends the life of the equipment attached to it.

PTFE expansion joints also named PTFE bellows,usually used in chemical pipes.It has excellent corrosion resistance.

In addition to solving the problem of different diameters in the connection of metal pipes, the single-sphere concentric reducing rubber joint has the advantages of strong vibration absorption capacity, obvious shock absorption effect, and elasticity in compression and riot resistance due to its spherical structure. The single-sphere concentric reducing rubber joint is mainly used in piping systems where the outlet of the pump valve and the outer pipe are different in size, or the thickness of the pipe needs to be changed according to the flow of the medium, and it will also be used where the flow is changed, so that it can be realized. Pipes of different sizes can be connected in a straight line to realize pipe fittings with reduced pipe diameters. The single sphere concentric reducing rubber joint is a flexible connection device for metal pipes. There are many models and specifications of the single sphere concentric reducing rubber joint. The single sphere concentric reducing rubber joint conforms to the development trend of the times and conforms to the CJ/T208-2005 standard , After continuous technical research and development with technicians, a sphere is a single sphere, and the two ends have nominal diameters of concentric and different diameter molds, which are then formed by the technicians through continuous winding and pressure testing processes for conveying water and sewage Single sphere concentric reducing rubber joints for media such as, oil, etc. According to different materials, it can be made into various varieties such as acid resistance, alkali resistance, corrosion resistance, oil resistance, high temperature resistance, radiation resistance, abrasion resistance, and aging resistance, and can be adapted to various media and environments. It mainly plays the role of reducing vibration and noise of pipeline or equipment, protecting the normal operation of pipeline or equipment, and improving the service life of equipment or pipeline. Because of its characteristics, it is also called a pipe shock absorber. The single-sphere concentric reducing rubber joint is small in size, light in weight, easy to install and maintain, and can absorb the axial and lateral angular displacement caused by the vibration of the pipeline equipment or the thermal expansion and contraction after installation. The vibration and noise reduction effect is good. The concentric reducing rubber joints effectively prevent the medium from corroding the sphere in the high temperature, acid, alkali and oil resistance environment, and improve the service life. It is widely used in basic projects such as chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, and electric power.