A cartridge type mechanical seal is a pre-assembled package of seal components making installation much easier with fewer points for potential installation errors to occur. A cartridge seal will have the following elements: Gland, Sleeve, Seal faces (2 or 4), an energizing force source (single spring, multiple springs, metal bellows, or elastomer), and a lock collar to set it to the shaft.
The assembly is "pre-set" so that no installed length calculations must be performed for determining where to set the seal. This pre-set is achieved by the use of "set tabs" that are removed once the seal is installed and the pump assembled.
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