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Stem thread maintenance
source: | author:pmo7ea5f6 | time :1912天前 | 886 browse: | 分享到:

- stem threads exposed to air shall be well lubricated to minimize thread wear and reduce operating torque of the valve.
- lubrication of the threaded portion of the stem is necessary. Lubricating the seal area of the stem is not recommended. Or else , it  may cause some harmful impurities and particles to attach to the stem or enter the packing box with serious consequences.Eg.stem threads are severely worn or deformed.