When {HEAD ~ the nut} is rotated in the direction opposite the first direction, the nut shoulder contacts the nut retaining ring and urges the stem axially away from {TAIL ~ the valve body} 
When { HEAD ~ the nut } is rotated in the direction opposite the first direction , the nut shoulder contacts the nut retaining ring and urges the stem axially away from { TAIL ~ the valve body }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL