How to choose the right shaft seal for your slurry pump?

In the classification of pumps, according to its condition of conveying slurry, we call the pump which is suitable for conveying liquid (medium) containing suspended solids as slurry pump. Slurry pump is currently one of the indispensable equipment in various processes such as mineral processing, coal processing, desulfurization and filter press feeding. As people pay more and more attention to environmental protection, the sealing of slurry pump is also paid more and more attention.

Slurry pump shaft seal mainly has three kinds: packing seal, vice impeller seal and mechanical seal. Each of these three shaft seals has its own advantages, which are introduced as follows.

Packing seal.

The packing seal of the slurry pump relies on the soft and hard grinding between the packing and the shaft sleeve to achieve the sealing effect. Packing seal needs to add shaft seal water, and its pressure must exceed the slurry pump discharge pressure. This type of seal is easy to replace and is widely used in mineral processing plants and coal washing plants.

Impeller seal.

The slurry pump's discharger seal relies on the sealing effect achieved by the resulting pressure discharger. This sealing method is used when the user lacks water resources.

Mechanical seal.

Mechanical seals rely on the close contact between the rotating ring and the static ring in the axial direction to achieve sealing. Mechanical seal can prevent water leakage and is especially popular in major domestic mineral processing plants and power plants. However, care should be taken to protect the friction surface during installation to avoid wear. Mechanical seal is generally divided into single mechanical seal and double mechanical seal.

At this stage, we recommend the use of single mechanical seal with flushing water mineral separation equipment. This type of mechanical seal is widely used. Although mechanical seal manufacturers also recommend the use of mechanical seals without flushing water, they are not ideal for field applications.

In addition to these three common shaft seals, there is another type of shaft seal, known in the industry as the "L" shaped shaft seal. This type of shaft seal is generally used for large or large slurry pumps, but rarely used for small and medium-sized slurry pumps.