Rod seal provider today: What are Mechanical Seals? Mechanical seals are devices that accommodate a rotating shaft while containing and preventing the fluid from leaking out of the enclosed housing. While different mechanical seal designs are available for pumping applications, most have three sealing points. Rotating face that rotates with the shaft; Stationary face fitted to the pump housing; Interface portion between the rotating and stationary face of the seal. These three sealing points ensure that the fluid contained within the pump housing does not leak while also preventing dust particles in the atmosphere from entering the housing. The mechanical seals are usually made up of different materials to prevent sticking. Typically, one side of the seal uses softer materials like carbon graphite, and the other is made of harder materials such as silicon carbide or ceramic alumina. However, hard materials are preferred for both surfaces if the pumping application involves abrasive fluids. In addition to the two materials, the sealing unit also comes with O-rings to seal the stationary face on the housing side and the rotating face on the shaft side. Springs are also used to keep both faces pressed. In most cases, the two faces of the seals are also lubricated to prevent friction and wear. Depending on the application, this fluid film can either be a separate lubricant or the process fluid itself. Find even more info at https://www.dmsseals.com/.
The Fluid Film – In most mechanical seals the faces are kept lubricated by maintaining a thin film of fluid between the seal faces. This film can either come from the process fluid being pumped or from an external source. The need for a fluid film between the faces presents a design challenge – allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself. This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces. This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces (the fluid film) acts to push them apart.
It can maintain stable performance after prolonged exposure to various corrosive compounds. Due to its lack of polarity, low unsaturation, and high chemical stability, our gasket has high resistance to various polar chemicals such as alcohols, acids (acetic acid, hydrochloric acid, etc.), strong base (sodium hydroxide, oxidant, hydrogen peroxide), detergents, animal and vegetable oils, ketones and certain esters. It is designed to have excellent aging resistance and excellent resistance to compression set and compression stress relaxation. Therefore, our gasket has significant advantages over other conventional gaskets. Its excellent materials and manufacturing process enables it to achieve effective sealing when exposed to corrosive chemicals, friction, high temperatures or very low temperatures. At the same time, it is easy to install and has industry-leading creep resistance, which saves users a lot of time and cost and increases productivity.
Scraper seals are also known as wiper seals. The scraper sealof DMS SEALS can effectively prevent various forms of contamination that cause a hydraulic system failure. It can be mounted on the outside of the piston rod seal of the hydraulic cylinder to protect the hydraulic cylinder from dirt, dust and moisture. It can well protect the hydraulic cylinder from environmental pollution and effectively prevent damage to the hydraulic cylinder parts, causing the system to malfunction. DMS offers a wide range of wiper seals for different hydraulic systems with different characteristics, specifications and combinations.
Diffusion leakage: Driven by the concentration difference, the medium leaks through the material transfer generated by the sealing gap or the capillary of the sealing material. Diffusion is the result of molecular motion and is not unidirectional. When the sealing pressure difference is extremely small or in a vacuum state, or when sealing permeable substances such as nitrogen and hydrogen, as well as highly toxic and radioactive substances, special attention should be paid to the leakage and diffusion.
The guide belt is a belt-shaped member that guides the moving parts. Its main function is to guide. In order to realize the function of guidance, it must support the guided member, and guide and correct its motion trajectory. In order to realize the guiding function well, it also requires isolation, shock absorption and noise reduction of the guiding parts. Guide belts are mainly used in oil cylinders and cylinders. Due to their excellent performance, they are also widely used in other motion mechanisms. Discover additional details at dmsseals.com.
DMS Seals is a professional mechanical seals manufacturer and oil seal supplier for hydraulic seals, O-Rings, spring energized seals, oil seals, mechanical seal and so on. Hydraulic seals including step seals, glyd rings, guide strips, wiper seals, rod seals, piston seals, rotary seals, wear rings. We can provide the hydraulic seals with bronze filled PTFE, carbon filled PTFE, graphite filled PTFE, MoS2 filled PTFE, glass filled PTFE, virgin PTFE. About O-Rings, we can supply NBR, FKM, silicone, EPDM, HNBR, ACM, FFKM material.
Key points of engineering mechanical seal design: Select a reasonable sealing scheme, focusing on the above requirements. First of all, the dustproof performance must be good. More than 80% of the failures of the hydraulic system are directly or indirectly derived from the stains in the system. Choose the best seals For seals of the same structure, the product quality of each company varies greatly. On the whole, the quality of large foreign seal companies is relatively stable, but the probability of encountering fakes is too high. Sometimes the so-called direct supply is not reliable. In terms of domestic seals, most of them are not very good, but at present, some manufacturers’ products have been chasing or even surpassing imported products, with stable and reliable quality, such as tetrafluoroethylene and rubber seals produced by Damson Sealing.
The O-ring seal, which is also called shaft seal, is noted for a reasonable compression and stretch rate to achieve a good sealing effect. It will not leak when it is sealed statically. At the same time, the O-ring size is properly matched to the groove size. The structure is simple and its installation is very close to the machine. Its most prominent advantage is its self-sealing effect, eliminating the need for periodic adjustments. We guarantee that the size and mounting grooves of all our O-rings are standardized, so they are cost-effective and easy to maintain. They have low frictional resistance and are suitable for occasions where the pressure is often alternating.