6. For spring‐to‐close only: To remove the valve plug (key 2), drive out the groove pin (key 4) and unscrew the valve
plug from the stem (key 47). If the groove pin (key 4) is not exposed, verify that downward movement of the stem is
not restricted by instrument linkages attached to the stem (key 47).
If the valve plug cannot be easily unscrewed from the stem, use a punch to keep the stem from turning as the plug is
removed.
7. For spring‐to‐open only: To remove the valve plug (key 2), first remove the spring case assembly (key 27). Remove
the adjustment screw nut (key 44), the upper spring seat (key 29), and the spring (key 30). Push the adjustment
stem (key 31) fully downward until the diaphragm plate (key 40) contacts the cap screws (key 38), exposing the
groove pin (key 4) in the plug. If the groove pin (key 4) is not exposed, verify that downward movement of the stem
is not restricted by instrument linkages attached to the stem (key 47). Drive out the groove pin (key 4) and unscrew
the valve plug from the stem (key 47).
If the valve plug cannot be easily unscrewed from the stem, use a punch to keep the stem from turning as the plug is
6. For spring‐to‐close only: To remove the valve plug (key 2), drive out the groove pin (key 4) and unscrew the valveplug from the stem (key 47). If the groove pin (key 4) is not exposed, verify that downward movement of the stem isnot restricted by instrument linkages attached to the stem (key 47).If the valve plug cannot be easily unscrewed from the stem, use a punch to keep the stem from turning as the plug isremoved.7. For spring‐to‐open only: To remove the valve plug (key 2), first remove the spring case assembly (key 27). Removethe adjustment screw nut (key 44), the upper spring seat (key 29), and the spring (key 30). Push the adjustmentstem (key 31) fully downward until the diaphragm plate (key 40) contacts the cap screws (key 38), exposing thegroove pin (key 4) in the plug. If the groove pin (key 4) is not exposed, verify that downward movement of the stemis not restricted by instrument linkages attached to the stem (key 47). Drive out the groove pin (key 4) and unscrewthe valve plug from the stem (key 47).If the valve plug cannot be easily unscrewed from the stem, use a punch to keep the stem from turning as the plug is
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