Selection of mechanical seals
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Let me first talk about the factors I consider when making my selections: 1, shaft diameter; 2, the physical properties and temperature of the medium. I choose the materials for the rotating and stationary rings based on these factors, and I select the material for the O-rings considering the temperature. That’s how I usually make my choices. Do I also need to take into account the elastic coefficient and length of the springs? Are there any other factors to consider?
Are you involved in mechanical seals or in the sales of this product? We usually purchase the relevant spare parts directly from the suppliers. If I had to choose, not to mention whether to go ahead with the choice or not, I wouldn’t want to go through all the hassle just to end up with something that can’t be used. These days, even spare parts are customized; if you don’t buy from a specific brand, they won’t work
Reply to 2# luoheng116: Let’s find out; maybe I’ll be working as a salesperson that day, hehe
The properties of the material also need to be considered, such as whether it contains particles and whether it crystallizes easily. These are important for choosing the materials of the stationary and rotating rings.
The main factors to consider are the medium, temperature, pressure, and rotational speed; these basic elements are sufficient to determine the so-called operating conditions, which in turn allow for a suitable selection to be made
The answer on the 4th floor was quite good. In addition, the medium name, temperature, viscosity, specific gravity, presence of particles, and if so, their diameter as well as the properties of the particles (soft or hard), inlet and outlet pressures, etc.
Material is one aspect to consider, as is the type of sealing: double-end face dry gas seals are used for explosive gaseous media, while labyrinth seals can be used for situations where a small amount of leakage is acceptable, such as with air