Welcome to our dedicated tag page for Rotary Union Water, your one-stop hub for all things related to water swivel joints. Whether you’re searching for industrial rotary unions, swivel joints for water cooling, or mechanical seals for fluid transfer, this aggregation page provides the latest insights, product highlights, and expert guidance.
A Rotary Union Water (also known as a fluid rotary joint) is a precision device that allows the transfer of water (or other liquids) between stationary supply lines and rotating equipment without leakage.
Advanced sealing technologies, including lip seals and mechanical seals, provide a tight seal, preventing fluid leakage and minimizing the risk of contamination.​
Manufacturers engineer many rotary unions to withstand high‑pressure applications, making them suitable for demanding industrial environments.
They can handle a wide range of operating temperatures, ensuring reliable performance even in extreme conditions.​
Designed for quick and hassle-free installation, rotary unions also require minimal maintenance, reducing downtime and operational costs.
Industry professionals most commonly use the water-based rotary joint for hot water, cooling water, tap water, acid–base water, and virtually any other water application. Engineers should select the appropriate model for these multi‑phenomenon scenarios to boost efficiency and prevent unnecessary issues like leakage‑related delays.
Our team also carries out tests according to the matched model when the product leaves the factory, so as to achieve the good condition of the product and save maintenance time for customers.
Generally, Manufacturers often use tap water as a medium in coating, printing, and other equipment. For this type of equipment, we generally recommend the use of hydraulic water and tap water type rotary joints. Their biggest advantages are a small body, small torque, fast speed, and small load-bearing pressure. Their small and light body reduces the load during work. The use of precision casting seals, silicon carbide, alloy, and other seals makes their friction joint surfaces more stable than ordinary seals. The double-sided alloy will be wear-resistant, and the hard sealing surface will not leave scratches. There will be no damage or leakage after 3 to 5 years of application.
Some tap water is not as clean and free of water residue as filtered pure water. Soft graphite and polytetrafluoroethylene are more suitable for use in the state of non-pure water. In this case, slowly rotating compensation will automatically repair the fine friction surface, thereby obtaining more use time.
Manufacturers generally install hot water–type rotary joints in heaters, steel‑mill rolling mills, rubber processing, pharmaceutical equipment, and other machinery. For products used for high-temperature water, the small body and small torque of tap water are not suitable for them. The most important thing to consider about the “heat” issue is how to dissipate the heat for them. If the body is larger, it is more important to make the sealing frame more spacious. The frame will release the concentrated pressure brought by the medium to the sealing accessories, so that its temperature cannot reach a high level, which is the same as the concept of focusing light under the sun with a magnifying glass we use.
When heat concentrates at one point, the seal cannot dissipate it, causing the seal to weaken. In a long-term working environment, leakage is inevitable. In high-temperature hot water rotary joints, we generally use copper seals to achieve the heat dissipation effect. Silver should be the best metal for heat dissipation. Considering that the value of silver is relatively high and the quality of silver is relatively soft, it is not suitable for use in heavy equipment accessories, so its value will be better reflected in human body decoration, and copper seals have better hardness. It has high heat dissipation performance and becomes an accessory for hot water heat dissipation.
When measuring pressure, we also use hot water to test for leaks. Generally, the pressure test of our tap water can be completed in 3-5 minutes, but the hot water type is different. This type of model is also what we often call “slow heating type”.
In addition, the hot water medium of the current equipment is not directly added to the equipment with boiling water, but is achieved by heating with tap water. Generally, the equipment is filled with water, and it takes about 10-30 minutes to reach 90 degrees.
Therefore, when it leaves the factory, our leak detection time is generally set at about 18 minutes. This time is also the time to confirm whether it is leaking. Sometimes when you are testing for leaks, there will be no problems within 5 minutes. There will be some penetration but no dripping in 10 minutes. When the water temperature reaches above 90, the seal is not fixed well or some other factors, and after 15 minutes, there will be more serious leakage. Therefore, it is generally necessary to ensure that no dust or iron scale penetrates during assembly. A clean assembly environment is also a major factor that determines their leakage.
Manufacturers use acid and alkali water less frequently, primarily in medical equipment. They use smaller products in applications where the operating temperatures aren’t very high. As the name implies, acids and alkalis are generally corrosive, so the effect of casting and copper is not so good. We generally recommend the use of 304 stainless steel rotary joints, which have good corrosion resistance and can withstand high-pressure environments. The alloy sealing surface not only has a good sealing effect, but also has good corrosion resistance. There are no special requirements for leak detection. Problems can appear in about 5 minutes. Unless the customer has any special requirements, there are generally no problems.
Rotary Union Water is an indispensable component in modern industrial machinery and fluid handling systems. Its leak-proof design, high-pressure capability, and temperature resistance make it a reliable and efficient solution for transferring water and other fluids in rotating applications. By understanding the key features, applications, and selection criteria of rotary unions, you can choose the right device for your specific needs and ensure the smooth and reliable operation of your machinery.
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