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