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1. Do not damage the sealing surface or sealing line of the sealing element surface The sealing performance of plane seals depends on the upper and lower end faces; The sealing performance of hydraulic seals depends on the lip line associated with the hole or shaft. These parts are composed of special materials that are soft and resilient, which are resistant to temperature, corrosion and aging, such as graphite, rubber, plastic and fiber, which are vulnerable to damage. Therefore, special protection and care should be given in the process of handling, installation and pipe protection. Once damaged, it often leaves…

Hydrogenated nitrile rubber is obtained by selectively hydrogenating butadiene group in nitrile rubber. The performance of hydrogenated nitrile rubber O-ring seals depends on the content of CAN (18% - 50%) and carbon carbon bond saturation. Its main characteristics are: good heat resistance, organic peroxide vulcanized materials can be used continuously for more than 1000 hours at 160 ℃, while NBR loses its continuous use value at 150 ℃; The oil resistance is excellent, and the performance of oil resistance and alcohol based oil resistance is greatly superior to the corresponding NBR and NBR/PVC blends; Low temperature resistance is better than…

1. Main performance The section of the Y-shaped seal ring is Y-shaped, which is a typical lip shaped seal ring. It can be divided into wide type, narrow type and Yx type according to the different proportion of height and width of its section. According to whether the two lips are equal in height, they can be divided into Y-shaped seal rings with equal height for shafts and holes, Y-shaped seal rings with unequal height for shafts and Y-shaped seal rings for holes, Y-shaped sealing ring is widely used in reciprocating sealing device, and its service life is longer than…

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main reasons for O-ring damage are the permanent deformation of O-ring materials and the gap bite caused by O-ring being squeezed into the sealing gap. The primary O-ring appears distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…

Generally, there are four types of gasket leakage: interface leakage, seepage leakage, diffusion leakage and damage leakage. Interface leakage: leakage will occur on the sealing interface due to insufficient gasket compression, improper flange joint surface finish, flange deformation, etc. For the leakage at the interface, it can be prevented by clamping it in the flange face with soft cushion. Infiltration and leakage: as the material of soft material is mostly fiber, it is easy to be soaked by medium, especially under pressure. Due to capillarity, the medium will permeate to the low-pressure side, forming infiltration. Diffusion leakage: under the promotion…

On the basis of maintaining the excellent properties of silicone materials such as heat resistance, cold resistance, high voltage resistance and weather aging resistance, FVMQ fluorosilicone O-ring has excellent hydrogen resistant solvents, oil resistance, acid and alkaline resistance and lower surface performance due to the introduction of fluorine containing groups. Features of fluorosilicone rubber: 1. Oil resistance, solvent resistance and chemical resistance Compared with methyl vinyl silicone rubber, fluorosilicone rubber has excellent oil resistance, solvent resistance and chemical resistance; Even compared with fluororubber, oil resistance and solvent resistance are also good. It shows excellent durability after immersion in the same…

As a kind of synthetic polymer elastomer containing fluorine atoms on the main chain or side chain carbon atoms, fluororubber has incomparable high temperature resistance, chemical medium resistance and aging resistance properties, and has become an indispensable and irreplaceable basic material in modern industry, especially in the high-tech field. Beijing Institute of Aeronautical Materials has been conducting research on the compounding technology of fluoroelastomer since the 1970s, and has successively developed a series of fluororubber compounds with different properties and functions, which have been successfully used in aviation, aerospace, shipping, petroleum, automotive industries and other fields. In this paper, according…

During the processing, storage and use of rubber and its products, the physical and chemical properties and mechanical properties of rubber gradually deteriorate due to the combined effect of internal and external factors, and finally lose their use value. This change is called rubber aging. The surface is cracked, sticky, hardened, softened, powdery, discolored, mildewed, etc. A) Oxygen: the oxygen reacts with the rubber molecules in the rubber by free radical chain reaction, and the molecular chains break or cross link excessively, which causes the change of rubber properties. Oxidation is one of the important reasons for rubber aging. B)…

Improper design and use of O-ring will accelerate its damage and lose its sealing performance. The experiment shows that if each part of the sealing device is reasonably designed and the pressure is simply increased, the O-ring will not be damaged. Under the working conditions of high pressure and high temperature, the main causes of O-ring damage are the permanent deformation of O-ring materials and the clearance bite caused by O-ring being squeezed into the sealing clearance, and the O-ring is distorted during movement. 1. Permanent deformation Because the synthetic rubber material used for O-ring seal ring is viscoelastic material,…