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Static seal. According to the working pressure, the static seal can be divided into middle and low pressure static seal and high pressure static seal. The middle and low pressure static seal is usually made of soft material and wide gasket. The high pressure static seal is made of metal gasket with hard material and narrow contact width.

Dynamic seal. According to whether the seal is in contact with the zero degree parts in relative motion, it can be divided into contact seal and non-contact seal.

Generally speaking, the sealing property of contact seal is good, but it is limited by friction and wear. It is suitable for low sealing surface line occasions. In the contact seal according to the contact position of the seal can be divided into circular (radial) seal and end seal. Face seal is also called mechanical seal. Non - contact dynamic seal has labyrinth seal and dynamic seal.

The former is the use of fluid in the gap between the throttling effect limit leakage, leakage is larger, usually used in the stage sealing and other sealing; A less demanding occasion. The power seal has centrifugal seal, floating ring seal, spiral seal and so on. It relies on the power element to produce the pressure head to offset the pressure difference on both sides of the seal to overcome the leakage. It has a high sealing property, but the energy consumption is large, and it is difficult to obtain the high pressure head. Non-contact seal, because the sealing surface is not in direct contact, small starting power, long life.