Internal Mechanical Seal

Just like externally flushed mechanical seals, internally flushed mechanical seals prevent water from escaping the pump casing while also allowing the pump shaft to spin freely. However, the design is more sophisticated and more reliable.


Internal mechanical seals are located closer to the impeller of the pump, in an area that is filled with water upon start-up. Thus, they are essentially submerged in the system water and are exposed to about 25% of the pump flow. This is valuable because: (1) it eliminates the need for any exterior lubrication and tubing, and (2) the higher velocity of the water surrounding the seal provides better flushing, thus increasing the seal life.

In an externally flushed seal, the tubing forces the entire required flow rate at a very high velocity directly at the seal. The internally flushed seal is in essence sitting in a bath filled with water. Why does this increase seal life? Imagine you are sink washing a piece of your Grandmother’s fine china and her water quality is terrible. There is a great deal of sand in the water. Would you use a high velocity spray to clean it or soak it in a tub of water and gently swirl the washcloth around it? Like fine china, centrifugal mechanical seals are expensive to replace and are often exposed to water with a lot of debris.

While pumps designed for externally flushed seals are still available today, we recommend you specify and demand pumps with internally flushed mechanical seals for hydronic HVAC systems, whether the pump is part of a brand new installation or is a replacement for an existing pump with an external seal. Internally flushed seals require less service and help extend the life of the pump. 

For more info contact water pump repair dubai or call us at +971 4 252 2966

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