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