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Mechanical Seal

Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM
Mechanical Seal

Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM

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  • Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM
  • Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM
  • Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM
  • Mechanical Spring Seal 3.75″RTG22 SIC/SIC/FKM

Description

Mechanical seal type MG1 109-100 ASF G9

Size100-115*125-47 mm
Material  NBR/EPDM/VITON/ Ceramic/sic/tc/stainless steel
FaceSingle seal
Balance Unbalanced
Direction BI-direction seal
Mediumswater,oil ,weakly-corrosive mediums
Temperature-20 to 150 centigrade
Pressure 1.2mpa
Speed12m/s

dfb

 

Mechanical seal refers to at least a pair of end faces perpendicular to the axis of rotation under the action of fluid pressure and compensation mechanism elastic (or magnetic force) and with the cooperation of the auxiliary seal to keep fit and relatively sliding device to prevent fluid leakage.

The elastic loading mechanism with the auxiliary seal is the mechanical seal of the metal bellows which we call the metal bellows seal.In the light seal, and the use of rubber bellows as auxiliary seal, rubber bellows elastic limited, generally need to be supplemented by spring to meet the loading elastic.”Mechanical seal” is usually referred to as “machine seal”.

Mechanical seal is a shaft seal device of rotating machinery.Such as centrifugal pumps, centrifuges, reactors and compressors and other equipment.Because the drive shaft runs through the inside and outside of the equipment, there is a circumferential clearance between the shaft and the equipment, and the medium in the equipment leaks outward through the clearance. If the pressure in the equipment is lower than atmospheric pressure, the air leaks into the equipment, so there must be a shaft seal device to stop the leakage.There are many kinds of shaft seals. Because the mechanical seal has the advantages of less leakage and long life, the mechanical seal is the most important shaft seal in these equipment in the world.Mechanical seal is also called the end face seal, in the relevant national standards is defined in this way: “by at least a pair of perpendicular to the axis of rotation of the end face in the fluid pressure and compensation mechanism elastic (or magnetic force) role and auxiliary seal with the combination of the relative slide and maintain stick to prevent fluid leakage device

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What factors influence the performance of industry rubber seals

The sealing effect of the sealing ring is related to the material characteristics of the sealing ring. There is also a close influence on other factors. For example, the speed of rotation, working temperature, working pressure, working medium, etc., today I will tell you about the four factors that affect the sealing performance of the sealing ring.

First, the speed of rotation

  When the rotation speed is very low (< 0.03m/s), it is necessary to consider the smoothness of the operation of the equipment and whether the operational appears "crawling" phenomenon. When the movement speed is very high (> 0.8m/s), the lubricating oil film may be destroyed, and the oil seal is not well lubricated and frictions heat, resulting in greatly reduced life. It is recommended that polyurethane or rubber and plastic oil seal work in the speed range of 0.03m/s ~ 0.8m/s. High-speed oil seals need to put forward higher requirements for structure and material, and the speed of household appliances oil seals can reach 20000rpm. Both wear and temperature resistance need to be met, and the concentricity requirements of dynamic sealing on the installation are relatively high.  

Second, the temperature of the working environment

  Low temperature will reduce the elasticity of rubber and plastic oil seals, resulting in leakage, and even the entire oil seal becomes hard and brittle. High temperature will make the oil seal volume expansion, soft, resulting in the oil seal friction resistance increases rapidly and the pressure resistance decreases. It is recommended that the continuous operating temperature range of ordinary polyurethane or rubber and plastic oil seals be -10 ° C to +80 ° C. For the high temperature and high speed requirements of the working environment, we need to choose to use fluorine rubber and PTFE, high temperature resistance and wear resistance is better, the low temperature environment is generally to -40 degrees, and the rubber performance is tested at high and low temperatures to ensure that the product quality meets the requirements.  

Third, the working pressure of machinery

  The oil seal has a minimum service pressure requirement. Oil seals with low friction and low starting resistance should be selected for low pressure work. Below 2.5MPa, polyurethane oil seal is not suitable; High pressure to consider the oil seal pressure deformation, need to use anti-extrusion stop ring, grooving processing also has special requirements.

Fourth, the working medium

  General sealing media are gasoline, oil, diesel, grease, and some static sealing dust. In addition to selecting the working medium strictly according to the manufacturer's recommendations, it is important to keep the working medium clean. Aging or contamination of the oil will not only cause the components in the system to fail, accelerate the aging and friction of the oil seal, but also the dirt in it may scratch or embed the oil seal, making the seal fail. Therefore, it is necessary to regularly check the quality of the oil and its cleanliness, and replace the oil filter or oil according to the maintenance specifications of the equipment. The air remaining in the oil in the cylinder will be compressed by high pressure, which will cause the oil seal to burn out or even carbonize. In order to avoid this situation, exhaust treatment should be carried out at the initial operation of the hydraulic system. The hydraulic cylinder should also run at low pressure and slow speed for a few minutes to confirm that the residual air in the oil has been drained before it can work normally.