Friday, September 1, 2017

Points To Consider While Purchasing A Rotary Shaft Seal

By Betty Edwards


At home, or even in industries, individual machines require lubrication to operate their best. Lubrication is done through a rotating shaft whose end is closed has a Rotary Shaft Seal. These are low pressure seals that had been designed to fit between a rotating shaft and the body for better pumping while preventing the loss of the lubricating fluid.

There are various profiles of the product in the market and many at times, consumers are challenged while deliberating on the best seal that will ultimately solve their needs. One design common to many individuals is the TC design. Most pump seals are designed with a pre-energized lip and a secondary lip without a spring, though the secondary lip may miss in some products.

There is more. Mechanical pump seals can also be classified depending on their application. For instance, there are some used in the automotive industry, and it is not uncommon to see a bearing seal in a trailer. Others are specifically modeled to endure high temperatures and pressure. Depending on the rotation of the shaft, some profiles are regarded as directional, bi-directional and non-directional. Other manufacturers fit an enclosed rubber component, either reinforced or non-reinforced.

Regardless of the profile, one thing that these products have in common is that they are all used with a pumping medium or fluid. The entire kit features two main components. They include a stationary enclosure and rotating shaft. Without these pump seals, there would be gross leakages of the lubrication medium, which in turn leads to extra costs. Due to its design, they are also known as water pump or mechanical shaft seal.

Technically referred to as end-face seals, the rotary seal was first discovered in the nineteen hundreds, albeit their popularity began gaining ground after the World War II, specifically during the nineteen forties. As expected, it became widely used in homes and the industrial sector. Some internal components that make the product so unique are the gland plate, spring and the clamp ring. And until now, there has not been a better alternative for the lubricating purposes.

Before the invention of pump seals, people used mechanical packings and gland packings. In principle, they were aptly innovated, but the leakage rate was high, and that made them hardly applicable in machines. Further, the pumps were non-resistant to wear and tear, and that reduced their lifespan: Not to mention that the implications of that were increased costs. Therefore, the discovery of shaft seals offered a viable alternative.

To purchase the right equipment, there are a few factors that you need to put at the edge of your mind. One aspect you need to consider is the dimension of the product. Therefore, research to determine the stationary components of the pump seal, its size, the working length and the bore dimension.

One more thing that you need to consider is the sort of fluid medium that you will be using it on. And while the popular ones are used on oil, other are used on water or a semi-solid lubricant. Therefore, before setting out on the quest for these products, ask yourself the type of medium you will use it for.




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