Spring type mechanical seal 109

Spring type mechanical seal 109/MG1 is a single end non-equilibrium type integral rubber bellows with arbitrary rotation direction

The spring type mechanical seal 109/MG1 series is a commonly used seal, which is ingeniously designed, and the pushing ring serves as both a secondary seal and a driving element for the moving ring. The sealing surface can be made of various materials according to the medium used. It can be applied in wastewater or sewage containing particles, and can also be used for tandem or back-to-back double end sealing.Spring type mechanical seal 109

Operating parameters:

Pressure: ≤ 1.2 MPa

Temperature: -20 to 140 degrees Celsius

Linear speed: ≤ 10 M/S

Composition materials:

Sealing end face: graphite, silicon carbide, tungsten carbide

Auxiliary sealing: nitrile rubber, fluorine rubber, ethylene propylene rubber

Metal components: stainless steel

Mechanical seals can be classified into high-temperature and low-temperature resistant mechanical seals, high-pressure and corrosion-resistant mechanical seals, high-speed mechanical seals, and granular medium resistant mechanical seals based on the working conditions and medium properties of the seal. According to the different equipment used, it can be divided into mechanical seals for pumps, kettles, compressors, specialized equipment, etc. When selecting, different structural types and materials should be chosen according to their different uses. At the same time, appropriate auxiliary system solutions such as flushing, cooling, lubrication, etc. should be selected based on temperature and medium properties.

To fully utilize the performance of mechanical seals, it is necessary to select the correct type according to the usage conditions. Each seal can only effectively function within the specified usage range. If the selection and material selection are improper or exceed the specified usage conditions of the seal, it will significantly reduce the performance of the mechanical seal, shorten its service life, and even damage it quickly.

The main parameters to be considered for selection include: P-sealing chamber pressure (MPa), T-fluid temperature (℃), V-sealing shaft speed (m/s), characteristics of the sealed fluid, sealing life requirements, leakage requirements, and the effective space allowed for installing the sealing chamber.

The relationship between the working parameters of sealing and the structural materials of mechanical seals can be roughly summarized as follows:

Determine according to P value → Non balanced type, balanced type, single end face, double end face, multi end face (multi-stage);

Determine based on V value → Rotary, Static, Fluid Dynamic Pressure, Non Contact Type;

Considering the temperature T value, the structure of the seal, friction pair and auxiliary seal ring materials, lubrication and cooling methods, flushing and insulation measures, and cooling measures are determined based on factors such as flash evaporation of liquid film between end faces, heat shock resistance during temperature fluctuations, viscosity reduction and lubricity with temperature rise, heat resistance limit of auxiliary seals, intensified corrosion caused by temperature rise, brittleness of low-temperature materials, material aggregation or precipitation crystallization.

Considering the properties of the fluid, corrosion reduces the service life, abrasive particles accelerate seal wear, fluid saturation vapor pressure makes the end face easy to open, low viscosity or inclusions may cause dry friction problems, flammable, explosive, toxic, and may endanger environmental safety. Special design is required to determine the sealing structure, sealing material, lubrication method, isolation measures, and safety measures.

Considering the size of the sealing chamber → The space size of the sealing chamber is limited, and standard mechanical seals cannot be installed. Therefore, a special design of elastic element structure is adopted. Considering the service life requirements, such as rockets and launch devices with short service life but reliability requirements, special design and use of high-performance materials are determined.

The above parameters not only need to be studied one by one, but also need to be considered comprehensively, as they both affect and depend on each other.