| 摘要 |
Failure of a disc valve by abrasive wear caused by an abrasive fluid flowing through the valve is retarded by the provision of a resilient O-ring along the seating surface of the disc member. A second O-ring disposed within the central bore of the disc where it moves vertically along a shaft of the valve between its opened and closed positions avoids loss of sealing engagement with the shaft due to the wear of the disc due to friction and wobble on the shaft. Inexpensive polymeric discs incorporating such resilient O-rings have a service life which are at least comparable and in may cases in excess of the service life of more expensive stainless steel discs having a rubber coating thereon.
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