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There is no single classification standard for the types of seals in mechanical, which are usually classified based on different design characteristics and working parameters.
1. Classify by structural characteristics
This is the most core classification method, which directly affects the sealing performance and applicable scenarios.
Classification dimensions, main types, key characteristics, and applicable scenarios
This is the most core classification method, which directly affects the sealing performance and applicable scenarios.
Classification dimensions, main types, key characteristics, and applicable scenarios
a. The number of sealing end faces
Single send face is the simplest, lowest cost, and most widely used single end face structure, suitable for most conventional working conditions.
Double end faces have two pairs of sealing end faces, which have better sealing performance. They are usually used for flammable, explosive, toxic or particle containing media and require auxiliary systems.
Single send face is the simplest, lowest cost, and most widely used single end face structure, suitable for most conventional working conditions.
Double end faces have two pairs of sealing end faces, which have better sealing performance. They are usually used for flammable, explosive, toxic or particle containing media and require auxiliary systems.
b. The pressure compensation characteristic balance type can effectively reduce the force of medium pressure on the end face, and is suitable for high-pressure working conditions.
Unbalanced structures are simpler, but they can withstand limited pressure and are commonly used in low-pressure environments.
Unbalanced structures are simpler, but they can withstand limited pressure and are commonly used in low-pressure environments.
c. Spring element type
The spring compression type provides compensation force through a spiral spring, which is the most common. It can be divided into single springs and multiple springs.
The bellows type uses bellows instead of springs, with shorter axial dimensions. Among them, metal corrugated pipes are particularly suitable for high temperature and high viscosity media.
The spring compression type provides compensation force through a spiral spring, which is the most common. It can be divided into single springs and multiple springs.
The bellows type uses bellows instead of springs, with shorter axial dimensions. Among them, metal corrugated pipes are particularly suitable for high temperature and high viscosity media.
2. Other common classification methods
In addition to the above points, it can also be distinguished from the following perspectives:
According to installation position, it can be divided into internal installation type (static ring located on the inner side of the end face) and external installation type (static ring located on the outer side of the end face).
According to the direction of leakage: divided into internal flow type (leakage direction facing the axis) and external flow type.
According to non-contact structures, including fluid static pressure, fluid dynamic pressure, and dry gas seal, these types of seals utilize the fluid dynamic pressure effect to form a non-contact sealing surface with a longer lifespan.
According to working parameters, it can be divided into high/medium/ordinary/low temperature seals, high/medium/low pressure seals, and heavy/medium/light types of seals in mechanical to cope with different temperature, pressure, and shaft diameter conditions.
In addition to the above points, it can also be distinguished from the following perspectives:
According to installation position, it can be divided into internal installation type (static ring located on the inner side of the end face) and external installation type (static ring located on the outer side of the end face).
According to the direction of leakage: divided into internal flow type (leakage direction facing the axis) and external flow type.
According to non-contact structures, including fluid static pressure, fluid dynamic pressure, and dry gas seal, these types of seals utilize the fluid dynamic pressure effect to form a non-contact sealing surface with a longer lifespan.
According to working parameters, it can be divided into high/medium/ordinary/low temperature seals, high/medium/low pressure seals, and heavy/medium/light types of seals in mechanical to cope with different temperature, pressure, and shaft diameter conditions.
