Single and double mechanical seals come in several designs because they’re customized according to the specific applications within the industry that adopts them. Since mechanical seals serve such a wide range of sectors, they all have vastly different structures, designs, and features.
However, you’ll always find the following characteristics in every custom-designed mechanical seal.
When you have two metal faces rubbing against each other, there’s bound to be friction. A great mechanical seal design would have a mechanism in place to avoid this. Usually, you’ll find that it has a secondary seal, moving a total of two cycles per revolution against a flexible non-metallic mounted face.
Such motion lets the protective layer of chrome oxide form on the metal, thereby preventing wear, maintaining compression, and keeping the barrier fluid sealed shut. If the mounted face is metal, there would be friction, which would compromise the metal seals to the point where they would completely lose compression.
Operating liquids within the seals is, more often than not, unclean. When your seal design dictates that the springs be immersed inside this liquid, it all but writes them off. The springs end up catching the dirt from their surroundings, making them rougher and less responsive to the arrangement’s dynamics. Slowly, the seal faces start loosening up and opening to a host of contaminants that’ll ultimately render the mechanical seals useless.
Clean could mean a lot of things for a mechanical seal design, and you can be sure that all of it is good. The cleaner the components of an arrangement, the longer they’ll rotate and keep the equipment running.
When the springs on your design are placed on the atmospheric portion, they won’t come into contact with the operating liquid. While that comes with its own set of issues, it’s certainly a better option than plunging them into unclean liquid.
A stationary cartridge seal is one where the springs don’t turn with each rotation, which keeps them from getting misaligned and perform their function for long periods.
The layout of stationary springs is more difficult to manage than that of rotary seals, but that only makes them more suited to speedier applications, something their simpler counterpart can never manage with ease.
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