China Sealcon Company
Mechanical Seals for Pump

Mechanical Seals for Pump

Mechanical seal for pump is a kind of dynamic seal assembly, which is widely used on the rotating shaft. It is also known as the end seal. Consisting of at least a pair of end faces which are perpendicular to the rotating shaft, mechanical seal acts on the end surface through fluid pressure and compensation mechanism (elastic force or magnetic force). In addition, auxiliary seal makes the joint surface stick and keep relative sliding, so as to prevent fluid leakage.

Different Types of Water Pump Seals

Metal Bellow Mechanical Seals

Compared with common pusher seals, metal bellow seals have more advantages. The structure eliminates seal hang-up and has a long service life. It is widely used in high temperature application. Browse the page to see more about our products.

PTFE Teflon Bellow Mechanical Seals

Sealcon supplies PTFE bellow seal manufactured of high quality raw materials and modern technology. It's design has small friction resistance. This type of seal can be applied to chemical industries.

Single Cartridge Seals

Sealcon carries high-quality single cartridge seals that suit all types of pumps. Our single cartridge seals are easy to install and maintain. Our products are designed and manufactured in various specifications and caters to meet the different requirements of our clients.

Double Cartridge Mechanical Seals

The double cartridge mechanical seals have two independent seals, making them ideal for sealing hazardous liquids, corrosive liquids and so on. Our products are specially designed and manufactured, enhancing the safety in any individual sealing element.

PTFE Wedge Mechanical Seals

Sealcon's PTFE wedge mechanical seals can replace the seals produced by John Crane and Burgmann. We strictly control the qulity to promise the product reliability. This type of seals are often used where expensive and corrosive liquids are being processed.

Stationary Seats

We supply a wide range of stationry seats in different sizes. All are made of hiah-quality materials that meet the operating requirements. You may read the page or directly contact us for more product information.

Mechanical Seal Working Principle

The working principle of mechanical seal for pump is to form the thin liquid film between rotating ring and shaft, so that it can efficiently prevent leakage of medium and make the end face lubricated, which help achieve the sealing effect. Mechanical seals are often used in rotating machinery, such as pumps, compressors, and reaction stirred kettle.


Mechanical Seal Function in Pump

There are 2 common sealing methods of the pump: mechanical seal and soft packing seal. Each of them has different characteristics and they are also suitable for different occasions. The correct selection of mechanical seals is beneficial to reducing the cost and improving the working efficiency. 

Compared with the soft packing seal, the mechanical seal for pump has the following advantages:
1. Good sealing function. In the long working, the sealing state of mechanical seals for pump is very stable, and the leakage is small: about 1% of the leakage of soft packing seal;
2. Long service life. The general service life can reach more than 1~2 year when used in oil and water working occasions; and the mechanical seals should have 6-months service life when used in chemical medium;
3. Small consumption of friction power. The friction power of mechanical seals for pump is only 10% ~ 50% of the soft packing seal. And the abrasion of the shaft or sleeve can be negligible;
4. Long maintenance period. The mechanical seals for pump can still meet the requirements of usage, even thought its end face is in a certain range of repair;
5. Good earthquake resistance. It is not sensitive to the vibration of the rotating shaft.

Mechanical seals for pump have complex structure, higher requirements and cost. And the operators needs to have a certain level of technology, such as the basic knowledge of fitter and the characteristics of the mechanical seal.
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