Shaft Seals
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Dust seals and vapor seals are used primarily when the main objective is to reduce the possibility of product contamination from external sources, such as dust or rain water. Vapor seals can also be used to reduce evaporation from the tank, or to reduce the odor of a foul smelling product escaping from the tank.
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A stuffing gland, or stuffing box, is the oldest shaft seal design known to man. Although many refinements have been made over the years to improve the performance, the basic seal is not much different from when the first man packed rags around a shaft to minimize leakage on the water wheel. A modern stuffing gland utilizes ropes of specialized "packing", square in cross section, which wrap around the shaft and are compressed with a "follower' ring.
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he family of shaft seals known as mechanical seals is the most advanced type of seal used in the mixing industry. They can handle the highest pressures, maintain nearly leak free operation, and require minimum maintenance if installed and operated properly. Mechanical seals are increasing in popularity due to the growing environmental restrictions regarding any leakage from process tanks.
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