{HEAD ~ A series} of packing nuts 18 are threadably mounted on {TAIL ~ respective packing studs} 20 so as to adjust the loading on the packing within the bonnet and around the valve stem 
are threadably mounted on
{ HEAD ~ A series } of packing nuts 18 are threadably mounted on { TAIL ~ respective packing studs } 20 so as to adjust the loading on the packing within the bonnet and around the valve stem
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL 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 OTH OTH