{HEAD ~ The improvement} in a fluid valve 12, wherein said PTFE male and female rings are formed of {TAIL ~ carbon filled PTFE} and said V ring therebetween is formed of unfilled PTFE 
{ HEAD ~ The improvement } in a fluid valve 12 , wherein said PTFE male and female rings are formed of { TAIL ~ carbon filled PTFE } and said V ring therebetween is formed of unfilled PTFE
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