What Sealing Method Is Used For Stainless Steel Submersible Pumps?

Sep 02, 2024

There are four types of sealing methods for general submersible pumps: the fixed type submersible pump, which is usually used for low-pressure longitudinal pipelines. The sealing performance depends entirely on the fit between the plug and the plug body, and the compression of its sealing surface depends on tightening the lower nut; Packing type submersible pump achieves sealing between the plug and the plug body by compressing the packing. Due to the presence of fillers, the sealing function is better.
Usually, this type of submersible pump has a packing cover, and the plug does not need to protrude from the valve body, thus reducing the leakage path of a working medium; Self sealing submersible pump achieves tight sealing between the plug and the plug body through the pressure of the medium itself. The small end of the plug extends upwards outside the body, and the medium enters the large end of the plug through the small hole at the inlet, pressing the plug upwards. This structure is generally used for air media; Oil sealed submersible pumps have been widely used in recent years, with the emergence of oil sealed submersible pumps with forced lubrication. Because forced lubrication forms an oil film between the sealing surface of the plug and the plug body.
This way, the sealing function is better, the opening and closing are effortless, and the sealing surface is prevented from being damaged. The above are the uses of general submersible pumps, while the use of special submersible pumps in industrial enterprises is mainly high-temperature submersible pumps, which transport high-temperature liquids as the medium. If the high-temperature medium being transported is high-temperature liquid molten salt, this pump is a molten salt submersible pump. For high-temperature submersible pumps, it is required that the pump can withstand high temperatures, so there are special characteristics in the structural design and material selection of the pump.
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