{HEAD ~ An upper packing ring} set around the valve stem is closer to {TAIL ~ the loading source} and has V type PTFE rings to provide reliable low fugitive emission sealing and low friction 
is closer to
{ HEAD ~ An upper packing ring } set around the valve stem is closer to { TAIL ~ the loading source } and has V type PTFE rings to provide reliable low fugitive emission sealing and low friction
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH