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Many classification sealed. According to the media can be divided into sealed gas seal, liquid seal, etc.; types of equipment can be divided into the container by sealing, pipe seals, compressor seals, tank seals, etc.; sealing device according to the working pressure can be divided into high pressure seal, the pressure seals, vacuum seals, etc.; according to the relative motion between the sealing surface state can be divided into dynamic sealing and static sealing two categories.
Table 1-2 shows the working pressure of the sealing device according to the classification.

Pressure range/Pa
Type of seal
Application
Remark
1010以上
超高压密封
Special materials, such as diamond, explosion molding processing
With pressurized gas and liquid sealing
1010~108
High pressure seal
Natural gas, chemical and petrochemical industries, such as high-pressure polymerization process
108~106
Medium pressure seal
Process machinery manufacturing, hydraulic rotation, pneumatic, chemical, petrochemical and power industries
106~105
Low pressure seal
General machinery manufacturing, hydraulic and pneumatic components, civilian facilities
105~102
Low vacuum seal
Chemical, petrochemical, pharmaceutical, food, mineral processing and other industries
Vacuum-sealed
102~10-1
Medium vacuum seal
Chemical, dodge, machinery manufacturing, electronics and other industries, such as vacuum brazing, vacuum inkjet
10-1~10-5
High vacuum seal
Electronics, aerospace, nuclear energy, metallurgy and other industrial sectors, such as metals and pure metals smelting
10-5以下
Ultra-high vacuum seal
Electronics industry, aerospace, nuclear science and technology
Figure 1-2 shows the classification of static sealing, Figure 1-3 is a typical static seal structure [6].

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