Types of mechanical seals:

Mechanical seals differ in design, the way parts are placed, and the mechanism of repelling the force applied to the surfaces. There are several common types of mechanical sealing, which include:

Balanced mechanical seal:

This type is called a system where the forces entering the sealing surfaces are neutralized. Due to the low force in the sealing elements, lubrication is done homogeneously on the surfaces, and as a result, the lifespan of this type of sealing is long. Balanced mechanical seal is suitable for high pressure applications (above 14 atmospheres) and is also a good choice for fluids with low lubrication properties.

Unbalanced mechanical seal:

This type of mechanical seal is considered an economic choice and has less leakage due to more force on the surfaces. In contrast, the lifetime of an unbalanced mechanical seal is low. This option is suitable for low pressures and is not recommended for hydrocarbons.

Spring mechanical seal:

In this type, one or more springs are used to create the collecting force. Springs can be placed in fixed or moving elements. Spring-loaded seals can also be used for high pressures, but due to the presence of elastomers below the main sealing surface, there is high wear.

Mechanical seal without spring:

In this type, a metal or elastomer is used to create the collecting force. The springless mechanical seal is suitable for applications with high temperature and contaminated fluid, and its suitable operating range is low to medium pressure. Both spring and unspring designs can be balanced or unbalanced.

Mechanical seal cartridge:

In this type, all the parts are assembled in a single set, and as a result, the possibility of error in the assembly is reduced and the duration of the seal replacement is increased.