On certain USES is standard parts, such as the sliding bearing bushing, but in WQZ self-lubricating bearing in some places is not a standard parts, such as ordinary fittings bushing.
Liner bushing is the function of ring set, in the field of valve application LFB oilless liner, liner within the valve cover, general MPBZ oil-free bushings used ptfe or corrosion materials such as graphite, used for sealing function.
In the moving parts, because of friction and the wear and tear parts for a long time, when the clearance between the shaft and hole wear by a certain amount of time must be replacement parts, so the designers choose in design of low hardness, good abrasion resistance material for collar or bushing, thus reducing the wear and tear of shaft and housing.
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