Advantages and disadvantages of mechanical seals

1.Advantages of mechanical seals

(1) Solid structure, leakage could be reduced to a small amount, so long that the surface roughness as well as flatness of the main sealing surface are able to be ensured to meet requirements. If the material has strong enough to withstand abrasion and the mechanical seal is able to be able to achieve a small amount of leakage. Or even be invisible for the untrained eye to detect, leakage.

(2) Long-lasting. In a mechanical seal, the primary component of wear is the seal’s end face that is frictional due to the fact that the seal’s edge face under normal operating conditions isn’t big, it is typically utilized continuously for 1 to 2 years. However, special occasions can also be used for 5-10 years.

(3) There is no requirement to adjust the operation. Since the mechanical seal relies on the force of spring and pressure of the fluid to create the friction part of the friction fit during the process in the automated management of contact after assembly, the seal will not require adjustment as a normal soft compression packing.

(4) 4. Vibration resistance. The maximum amplitude of the vibration does not exceed 0.05mm in the case of a frequency of 3000r/min as well as the PV keeps growing.

(5) The power is lost at a low level. The packing seal acts upon the sleeve or shaft through pressure of the packing. The packing seal and the shaft are directly friction, the greater the packing pressure, the more rigid the friction and the higher the power consumption. Mechanical seal friction occurs when the friction is semi-liquid where the efficiency of friction coefficients are extremely small. The mechanical seal’s power loss is about 10 50 percent of the packing seal.

(6) A bellows’ seal shaft, also known as a sleeve, is not prone to wear and is not affected by the rotational shaft, and also the deflection of the shaft towards the shell.

(7) A wide scope of applications. If the media is flammable, hazardous, toxic or explosive and toxic, mechanical seals is a good way to ensure that it’s sealed. They are ideal for high temperatures low temperatures high pressure, vacuum at various speeds, and the seal of corrosive media equipment.

2.Disadvantages of mechanical seals

(1)Particularly the installation of dry gas sealing requirements, the structure is more complicated than the packing seal and processing precision requirements call for a certain installation technique. Furthermore, new technologies keep showing up in our upkeep has created fresh problems; the sealing technology is developing quickly.

(2) Complex architecture; disassembly and installation is not ideal. The mechanical end seal has more pieces than other seals, which calls for sophisticated construction and precision. Particularly in the assembly is more challenging to dismantle from the end of the shaft to pull out the seal ring; hence, either entirely disassembled or part of the machine (coupling). The split-type and assembled mechanical seals and so on guarantee the use of easy disassembly and assembly quality, thereby improving some aspects of this problem.

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