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Type 28ST combines proven rotating groove technology and high-temperature secondary seals to reduce steam leakage by nearly two orders of magnitude, as compared to traditional sealing devices such as segmented carbon rings and labyrinths.
This steam-lubricated, end-face cartridge seal reacts instantaneously and automatically to maintain a safe face gap despite sudden changes in operating conditions.
A stable seal face gap, typically 0.0025mm to 0.0051mm / 0.0001 to 0.0002, is the result of specially designed rotating grooves, which pump steam radially inward into a nongrooved portion of the seal known as the sealing dam. This seal is primarily for use on steam turbines.
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