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