Mechanical Seal Types And Choosing The Best For Centrifugal Pumps

Mechanical seals are designed to match most pumps, mixer and even for agitator applications. The design meets with the demands of industrial field and they deliver a rotary or full range configurations. The component materials of the seals handle virtually any fluid that is moved by equipment and you can enjoy advanced pump seal technology for your specific needs. There are different types of the mechanical seals used in centrifugal pumps and when buying them you also need to make a few considerations to choose the best.

Pusher seals – The pusher type of the mechanical seals move axially along rotating sleeve or shaft so that contact is maintained with the seal faces. This feature helps compensate for wearing that could occur on the face of the seal and misalignment wobbling. These seals are commonly used and they are less expensive. They are available in a wide range of designs and sizes but they tend to hang up and some fret the shaft. mechanical seal manufacturer 

Unbalanced seals – This type of mechanical seals is used in drastic conditions where shaft misalignment, vibrations and fluid cavitation problems are present. They allow less fluid leakage and are very stable yet inexpensive. They are, however seals designed for low pressure ranges and too much fluid force could interfere with a lubricating film between face and seal will fail.

Conventional seals – They are simple seals that need to be set and aligned on sleeves or pump shaft.

Non-pusher seals – Unlike the pusher mechanical seals, they do not need to be moved axially to maintain face contact. They are great for low pressure and also high pressure applications, but there is a need to upgrade bellows when working under environments that are corrosive.

Balanced seals – They are able to sustain high pressures on faces and they do not generate much heat. For this reason they are suitable for liquids that have low lubricating capacity or high vapor pressure hydrocarbons.

Cartridge seals – Their main advantage is ease of installation, especially when compared with conventional seals. Seal setting errors are greatly reduced and this also reduces maintenance required for the seals.



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