It was found that during the mechanical cycles, packing friction was very low so that the friction of the combined two part packing assembly with {TAIL ~ PTFE} and {HEAD ~ graphite material} is significantly less than the friction of a sole graphite packing system with similar leakage characteristics 
It was found that during the mechanical cycles , packing friction was very low so that the friction of the combined two part packing assembly with { TAIL ~ PTFE } and { HEAD ~ graphite material } is significantly less than the friction of a sole graphite packing system with similar leakage characteristics
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH