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In general, the contact seal seal due to contact with the sealing surface, the gap can be eliminated or to seal the gap to a minimum, so you can achieve a high sealing performance, but subject to the friction and wear of the material for the sealing surface line speed relative In the lower case, contact seals can be divided into radial (circumferential) and axial (face) seals according to their contact points. End seals, often referred to as mechanical seals, are currently the most widely used form of seal for industrial pumps.
Non-contact seal seal is not in direct contact, no mechanical friction and wear, suitable for high linear velocity applications, long working life, but poor sealing performance, reasonable design can achieve zero leakage. Seal includes labyrinth seal, floating ring seal, screw seal and end face power controllable membrane seal.
Combined seal can have the advantages of both contact and non-contact seals to meet the requirements of high-parameter seals, but the structure is complex, the system is huge, so the general industrial pump does not use such forms of sealing.
Closed-end seal is to use the machine casing or enclosures all enclosed live, closed-end pump has the advantage of no shaft seal, usually used to seal flammable, explosive and highly toxic media.
Depending on the characteristics of the seal used in the pump product, the purpose of the seal, the characteristics of the mechanism, the basic structural specifications and the specific structure, the fluid seal can be classified in detail.