Mechanical Seals

Mechanical Seals

What are mechanical seals (End-face Mechianical Seal)? Also known as a face seal, the mechanical seal is a rotary machine shaft seal device, refers to the mechanical seal at least a pair of perpendicular to the axis of rotation of the end surface in the liquid pressure and compensation for the role of tissue elastic (or magnetic) and auxiliary seal cooperation, so as to keep the paste and the relative sliding and constitute the equipment to avoid leakage of fluid. The primary function of mechanical seals is to prevent leakage of gases and liquids in rotating shaft applications. It is widely used in mechanical seal specifications for pump, kettle, compressor and other similar equipment, e.g. the rotation of the shaft seal.

Different Types of Mechanical Seals for Pumps

  • Mechanical Seals


    How do Mechanical Seals Work?

    Mechanical seals are usually made of moving rings, stationary rings, compression elements and sealing elements. These parts are tightly bonded to form a sealing surface to avoid leakage. The liquid in the sealed chamber causes the end face to press against the end face of the stationary ring, and the mechanical seal occurs on the end faces of the two rings and the adhesion is to maintain the compression of the component pressure. The pump can not only work in the state, but also adhere to the end of the paste to ensure that the sealing medium does not leak, and avoid impurities into the sealed end. The sealing element acts as a gap between the sealing ring and the shaft, the action of the static ring and the gap of the gland, and the oscillation of the pump with the elastic element. When running with other components of the pump, the condition of the mechanical seal is closely linked with the external conditions. Only if the parts, auxiliary sealing equipment and technical requirements are ensured that the mechanical seal works well.


  • How to Install Mechanical Seals?

    First, we need to turn off the pump, and then clean and inspect each part of the pump. Second, remove the impeller by rotating it in the anticlockwise direction. Then take out the seal at the backside of the impeller, and place the mechanical seal on to the shaft. Fix the mechanical seal and screw the impeller onto the motor shaft. Here are some notes of installation:
    Pay more attention to avoid installation deviation;
    The compression quantity of the spring should be carried out according to the regulations. Bigger or smaller are not allowed. The error should be within 2 millimeters;
    To ensure the beard can move flexibly on the shaft. And the spring should be able to automatically bounce back when the dynamic ring compressing the spring.
    Notes of disassembling the mechanical seals;
    Be careful when disassembling the mechanical seals: don’t use a hammer or chisel in case of damage. Steel wire hook is available;
    Pay attention to the mechanical seals when they are used in the two ends of the pump;
    Change the dynamic and static ring parts when the mechanical seal is moved because of the loosening of the lid.
  • What are Mechanical Seals Made of?

    With its wide range of designs, the mechanical seals can also be made of different materials. In fact, the seal face materials decide the service time of mechanical seals. The most popular materials include rubber, stainless steel, PTFE, carbon, ceramic, Sic, and TC.

    In SEALCON, equipped with advanced CNC processing equipment, you can not only buy the mechanical seals, but also buy the mechanical spare parts: sealing rings, spring, O-ring, sleeve and gland. All of our products conform to the standard of DIN24960, EN12756, ISO3069 API610, API682. 
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