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.” Primarily for use on steam turbines. s This steam-lubricated, end-face cartridge seal reacts instantaneously and automatically to maintain a safe face gap despite sudden changes in operating conditions. ![]() Non-Contacting, Steam Turbine Gas Seal A – Seat/Mating Ring B – Face/Primary Ring C – Split Carbon Ring Assemblies Spiral Groove Face Product Description 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.
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