What are the other materials of the mechanical seal parts except friction pair & auxiliary seal

The mechanical seal is composed of several parts, and the material of each part is selected or developed according to its function, structural characteristics and service conditions. The selection of materials often becomes a very critical issue, which is of great significance to ensure the stability of the mechanical seal, prolong its service life, reduce costs, etc., and even determine the success or failure of the seal.

The previous articles in this series talked about the friction pair materials and auxiliary sealing materials of mechanical seals. This article mainly talks about the elastic element materials and other structural materials of mechanical seals.

The elastic loading elements of mechanical seals include compression coil springs, wave springs, metal bellows, etc. The material is required to be resistant to corrosion, fatigue, high and low temperature, high strength limit, high elastic limit, and there is still enough elasticity to maintain the tight fit of the sealing end faces of the mechanical seal after long-term work.

Other structural parts of mechanical seals, such as spring seats, push rings, rotating ring seats, non-rotating ring seats, set screws, transmission pins, etc., are not key components, but their design and material selection cannot be ignored, except that they should meet the mechanical strength requirements In addition, the ball must be corrosion-resistant. Generally, 2Cr13 is used. In corrosive media, 1Cr18Ni9Ti, OCr18Ni12Mo2Ti, Monel alloy, etc. should be adopted respectively.

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