Low-temperature centrifugal liquid pump is mainly used for liquid oxygen, liquid nitrogen, liquid argon and other cryogenic liquids. This type of equipment generally uses mechanical seals in the form of edge-welded metal bellows. The following points should be noted when selecting:
1 Reasonable structural design can ensure that the mechanical seal does not break the sealed end face and the bellows assembly under high speed operation;
2 Reasonable end-to-face contact pressure can ensure the sealing performance of the mechanical seal and avoid premature failure;
3 Reasonable frictional materials can ensure the normal friction and sealing performance of the mechanical seal under low temperature conditions, avoiding premature failure due to excessive wear;
4 The appropriate heat treatment of the metal bellows part can eliminate the residual stress caused by the welding, so as to avoid fatigue cracking during long-term operation.