Replacing Packing - Emerson Fisher HS Instruction Manual

Instruction Manual
D100381X012
Figure 6. Detail of Graphite Ribbon/Filament Packing for Standard and Radiation Bonnets
A5864/IL
NOTES:
0.004 INCH (0.102 mm) THICK SACRIFICIAL ZINC WASHERS; USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
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Replacing Packing

1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut-off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock-out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Disconnect the valve stem from the actuator by unscrewing the cap screws and removing the stem connector.
3. Unscrew the yoke locknut (valves with 3/8, 1/2, or 3/4-inch stems) or eight cap screws and nuts (valves with 1 or
1-1/2-inch stems). Remove the actuator from the valve.
4. To remove the bonnet (key 29), unscrew the bonnet nuts (steel valves); then proceed as follows:
a. For direct-acting valves, remove the bonnet, valve plug, and stem as a unit. Unscrew the packing flange nuts and
remove the packing flange, upper wiper (if one is used) and packing follower. Slide the valve plug and stem out
of the bonnet.
3/8 INCH
1/2 INCH
(9.5 mm) STEM
(12.7 mm) STEM
SINGLE ARRANGEMENTS
3/8 INCH
1/2 INCH
(9.5 mm) STEM
(12.7 mm) STEM
DOUBLE ARRANGEMENTS
PACKING FOLLOWER
(KEY 13)
GRAPHITE RIBBON
PACKING RING
(KEY 7)
GRAPHITE FILAMENT
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
3/4, 1, OR 1‐1/4 INCH
(19.1, 25.4, OR 31.8 mm) STEM
PACKING FOLLOWER
(KEY 13)
GRAPHITE RIBBON
PACKING RING
(KEY 7)
GRAPHITE FILAMENT
PACKING RING
(KEY 7)
LANTERN RING
(KEY 8)
PACKING BOX RING
(KEY 11)
3/4, 1, OR 1‐1/4 INCH
(19.1, 25.4, OR 31.8 mm) STEM
HS Valve
June 2019
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