Dry running seals have sanitary gland option
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Flowserve product story
Edited by the Engineeringtalk editorial team
Jul 24, 2002
VRA dry running seals from Flowserve are an economical, no-nonsense design specifically for use with top entry mixers and agitators.
VRA dry running seals from Flowserve are an economical, no-nonsense design specifically for use with top entry mixers and agitators.
These products are single, outside mounted, balanced mechanical shaft seals which eliminate the need for buffer fluid systems, so preventing potential product contamination.
A flexible rotor design compensates for shaft misalignment, while clearances, drive design, seal face dimensions and O-ring configurations have been optimised for a high run-out tolerance up to 0.15in FIM.
A double O-ring mounted stator prevents distortion, with various configurations also available to suit different host equipment types.
The seals are manufactured from self-lubricating carbon or filled PTFE which accommodate dry running without cooling.
Long life and reliability are achieved by running in the dry vapour space at the top of the vessel, with heat quickly dissipated to ensure that seal face temperatures do not reach critical levels.
Seal face flatness is also important to reduce gas leakage, while face deflection resulting from pressure or thermal variations is also limited to prevent leakage or seal failure.
The outside seal design makes it simple for both installation and inspection whether mounted directly on the shaft or as a cartridge design.
The construction also distributes the drive torque to eliminate high stress areas with a flexibly mounted stationary insert reducing the potential of seal face distortion from gland bolt overtightening.
Operating limits range from full vacuum to 13.8bar at shaft speeds up to 350rev/min and temperatures up to 149C.
Seals can be provided for shaft sizes from 25 to 178mm, and an optional sanitary gland can be fitted which permits in-situ steam cleaning and sterilisation of interior parts.
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