ANGA : Uszczelnienia Mechaniczne Sp. z o.o.
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Below we present a set of basic concepts, expressions and definitions within the scope of face mechanical seal engineering. The dictionary can be browsed according to the first letters or using the list of entries.
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Seal balancing factor

Factor defined (sometimes in per cent) as the ratio of the seal ring face subjected to the closing force exerted by hydraulic pressure in the seal chamber to the entire face-sealed surface.

Seal chamber (gland box, stuffing box)

This is a separated space between the rotating shaft and the immobile pump casing, to which the seal is installed.

Seal operating conditions

It is the maximum/ minimum temperatures and pressures under static or dynamic operating conditions, rotational speed, kind of medium forced-through, its physical and chemical properties, existing mechanical impurities and the type of occurring limitations and hazards.

Seal type

This is a clear configuration of seal components which ensure optimum operating parameters under accepted operating conditions and classify a given solution to a type defined with regard to the method of solution. Every type has a separate designation.

Secondary seal

Such an element as O-ring or bellows, which enables the axial movement of the seal face without undesired leakage. This term sometimes is used for other gaskets which prevent leakage within elements of the mechanical seal.

Special seal

This is a seal designed individually for working conditions and/or installation, mount, operating conditions, which differs considerably from general application seals.

Staged shaft sleeve

Cylindrical sleeve ended with an internal stage, placed on the shaft to protect it against wear and corrosion. The stage is normally adjacent to the impeller hub (to ensure its proper position) and contains sealing between the shaft and sleeve stage.

Stationary sliding ring

An immobile element in the form of a disk or ring, mounted on the shaft sleeve or in the gland box cover, which is the basic part in axial contact with the remaining part of the seal (rotating unit).