What is the difference between mechanical and hydraulic seals for rotary joints?

With the advancement of small-scale technology, the number of rotary joint products on the market is gradually increasing, and new products are constantly emerging. The product selection is more refined, convenient, and applicable, playing an important role in normal production and life.

To extend the service life of rotary joints, in addition to reasonable selection, it is also necessary to do a good job in installation and daily maintenance, especially for sealing components. Poor maintenance can exacerbate wear and lead to leakage.

At present, there are mainly two types of seals used in rotary joints: mechanical seals and hydraulic seals. Many customers believe that the two are the same type of seal, but there is actually a big difference between the two. The rotary joint can choose the connection method based on its working condition. The transmission medium inlet can be freely selected from the side or back according to the working conditions. The sealing surface and sealing ring are made of special materials, which have the characteristics of pit wear, long service life, corrosion resistance, and no leakage. Mechanical seals are very precise in construction, and the installation steps are quite complicated. The installation method, installation accuracy, and model ratio all determine the effectiveness and service life of mechanical seals. If maintained well, the service life will be long. The use of hydraulic seals should be determined based on pressure, in order to achieve higher efficiency in operation and control. Due to the different types and degrees of use of seals, various machines may encounter some problems during use. During procurement, maintenance and repair, it is often difficult to choose suitable seals. The following is an introduction to how to purchase suitable seals;

Check the direction of movement of the seal, whether it is rotating or fixed, etc. There are independent pipelines inside the high-speed and high-pressure rotary joint, which can be selected according to different working conditions and requirements to achieve great benefits. The shell and shaft are supported by precision bearings, making them flexible and lightweight during rotation, with low friction. Liquid media can include water, oil, air, etc., and are widely used in various industries. During the use of bimetallic composite pipes, it is necessary to check the working pressure of the sealing components and choose a wide range of structures. After use, components may experience wear (a basic type of component failure) and deformation. In this case, if you choose to purchase seals according to the design size, it is often not possible to fit them properly. You should measure them according to the current size, and then use the design size as a reference to choose and purchase them to improve the accuracy of rotation. Pay attention to the temperature of the working environment in which the seal is located. Not every temperature is suitable for operation, so special attention should be paid. The high-temperature rotary joint is designed for special mechanical functions, and the fixed ring sealing part is made of carbon graphite, which is wear-resistant, impermeable, and dry running.