DN350 Rubber Expansion Joint

DN350 rubber expansion joint is a core flexible connecting component for absorbing displacement, buffering vibration and reducing noise in medium and large diameter pipeline systems. Relying on over 20 years of experience in pipeline equipment manufacturing, our factory has carried out multiple rounds of optimization on the structural strength and sealing performance of this product for engineering scenarios such as municipal water supply and drainage, chemical pipeline networks and heating pipelines. As the core promoted specification, the DN350 rubber expansion joint is formed by a multi-layer nylon cord fabric skeleton combined with an integral molding and vulcanization process. The joint between the rubber body and the flange is reinforced with double sealing, which can not only efficiently compensate the axial, lateral and angular displacement of the pipeline, but also avoid leakage and delamination problems under long-term high-pressure operation. We can match different rubber materials according to project working conditions, from EPDM for conventional water supply and drainage, to NBR for oil-resistant scenarios and PTFE lining for strong corrosion conditions, all can be customized on demand. Meanwhile, it is compatible with flange interfaces of multiple national standards such as DIN, ANSI and GB, which greatly reduces the on-site installation and adaptation costs for overseas customers and leaves sufficient customization profit margin for agents.

In practical engineering applications, DN350 rubber expansion joints are usually arranged at pump outlets, valve connections and pipeline settlement sections, which can effectively reduce the damage to equipment caused by pipeline resonance and extend the overall service life of the pipeline system. This product produced by our factory is manufactured in strict accordance with international general standards. Before delivery, all products undergo a hydraulic pressure test at 1.5 times the working pressure, and the burst pressure can reach 2 times the working pressure, with performance indicators far exceeding the conventional industry level. For overseas purchasers and agents, we support full-dimensional customization of flange material, overall length and connection method, and can provide a full set of test reports and qualification documents along with the goods to help customers quickly implement local projects. With stable quality, flexible supply capacity and customizable advantages, this product has been exported in batches to more than 80 countries and regions such as Europe, America and Southeast Asia, and has become a designated supporting product for many engineering contractors.

The product is widely used in municipal water supply and drainage systems, urban central heating pipe networks, petrochemical pipelines, sewage treatment plants, HVAC systems, fire protection main pipe networks and other scenarios. It is especially suitable for medium and large diameter industrial and municipal pipeline projects, and can be matched with various pipeline equipment such as water pumps, valves and flow meters to realize flexible vibration reduction and displacement compensation.

We are a source factory with more than 20 years of production history of pipeline equipment. The factory covers an area of 10,000 square meters, with more than 50 full-time production and technical personnel, and a monthly production capacity of 15-20 standard containers, with stable mass supply capacity. The factory is equipped with a full set of production equipment such as fully automatic CNC drilling machines, automatic reverse wrapping molding machines for rubber soft joints, fully automatic vulcanizing machines and four-column hydraulic presses. The whole process from raw material mixing, molding to flange processing and finished product assembly is completed independently, which can realize large-scale production of rubber expansion joints of all specifications from DN15 to DN4000. We strictly produce in accordance with domestic and foreign standards such as GB, ISO, ANSI and DIN. Our products are exported to more than 80 countries and regions around the world, and can provide stable supply chain support and differentiated product solutions for overseas agents and engineering contractors.

We have established a whole-process quality control system, setting up multiple inspection levels from raw material entry to finished product delivery. In the raw material stage, the rubber compound and flange blank are re-inspected upon entry to confirm that the composition and performance meet the standards; in the production process, self-inspection and mutual inspection are implemented for each process, and core parameters such as vulcanization temperature and pressure are strictly controlled; in the finished product stage, 100% hydraulic test and full appearance inspection are carried out. The factory is equipped with professional testing equipment such as pressure testing machines, universal tensile testing machines, thermal aging test chambers and rotorless vulcanizers, which can accurately detect core indicators such as product pressure bearing capacity, tensile strength and aging resistance. We support on-site inspection by third-party institutions, and can also provide a full set of quality documents such as material certificates and test reports along with the goods to ensure that each batch of delivered products meets customer quality requirements.

We provide perfect after-sales guarantee for all products. The warranty period for conventional products is 12 months, and quality problems caused by non-human damage within the warranty period can be replaced free of charge. The after-sales team responds to customer needs 7×24 hours, and can provide remote technical guidance and solutions for problems during installation and use. During the order production process, we will regularly feedback the production progress and real-shot data to customers, the logistics is fully traceable, and we will actively follow up the usage after delivery. For long-term cooperative agents and purchasers, we also provide value-added services such as exclusive customer service docking, priority production scheduling, and free provision of promotional technical materials to fully guarantee the project promotion and market expansion efficiency of customers.

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