Metal seals have a wide range of applications:
First of all, the C-shaped seals are made of stainless steel, which has good pressure-bearing capacity and corrosion resistance.
Secondly, they are also suitable for working under high temperature conditions. The loop can work stably under high temperature.
Furthermore, metal seals are used in vacuum systems.
Its disadvantage is that it cannot be used repeatedly and requires high accuracy. However, the specifics still depend on the actual equipment.
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1. Features of metal C-type sealing ring
1. The common metal C-shaped sealing ring is made of stainless steel wire, does not contain any rubber components, and has strong usage characteristics. Generally, it can maintain normal working conditions under high vacuum, high and low temperature, strong radiation and various corrosive environments. What are the advantages of metal seals?
2. Among them, what is the structure of a metal material oil seal? It has the characteristics of wide operating temperature range, high pressure bearing capacity, and corrosion resistance. Especially in the installation and use of oil seals, the space occupied is small, the required sealing pre-tightening force is extremely low, and the sealed medium is not polluted. It is an ideal seal product under severe sealing conditions such as high temperature and high pressure.
3. The c-shaped metal sealing ring lining core is a component made of different metal wire diameters and densities, suitable for different pressure occasions. Under the conditions of high pressure and high temperature working environment (occasion), the general temperature range is 80~800°C. Due to the high cost of this metal sealing ring, the price of the sealing ring is also relatively expensive. But in a wide range of use environments (fields) with good performance, it has been unanimously recognized by people.
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2 The characteristics of the application of metal sealing rings in vacuum systems
1. First, let's talk about the advantages
1) The outstanding advantage of metal sealing is that its outgassing volume is much smaller than that of rubber materials, which can reduce the impact on vacuum.
2) Secondly, the metal-sealed vacuum system can bake and degas at high temperature to meet the requirements of ultra-high vacuum systems. Except for fluorine rubber and silicone rubber, most rubber sealing materials are difficult to work continuously and maintain good stability at high temperatures above 200°C.
3) In addition, the metal seal has better resistance to corrosive environments and the ability to resist erosion.
2. Although metal sealing has these advantages, there are also many problems and disadvantages:
1) The elasticity of metal seals is mostly poor, and a large sealing force is required to ensure a reliable vacuum seal.
2) The reusability of metal seals is very poor, and some metal seals can only be used once.
3) The roughness and matching precision of the flange sealing surface and the knife edge are very high. Small scars will damage the seal, and it is more difficult to process large flanges.
4) The linear expansion coefficients of the sealing ring and flange materials are very different. Uneven heating or incorrect sealing structure design will cause local deformation and air leakage.
3. Therefore, the use of sealing materials in conventional vacuum systems needs to be adapted to local conditions.
Metal sealing will show its advantages under special requirements such as high-temperature baking and ultra-high vacuum systems.
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