Basic principles of selection of mechanical seals

A seal mechanical seal refers to a device for preventing fluid leakage composed of at least a pair of end faces perpendicular to a rotation axis under the action of a fluid pressure and a spring force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal, and relatively slide.


Basic principles of selection of mechanical seals


  1. According to the working speed, determine whether to use rotary or static type, fluid dynamic pressure type or non-contact type.


  1. According to the pressure of the sealed cavity, determine whether the sealing structure is balanced or unbalanced, single or double end, etc.


  1. According to the effective space of the installation seal, it is determined to use multiple springs or single springs or wave springs, built-in or outer-mounted.


  1. According to the temperature and fluid properties, determine the friction pair and auxiliary sealing materials, and correctly select the grundfos pump seal cycle protection system such as lubrication, flushing, heat preservation, cooling, etc.

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