DUCTILE IRON FLANGED GATE VALVE
FIGURE 751
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INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
©2022 Ferguson Enterprises, LLC 0522 4108704
STEM PACKING REPLACEMENT
WARNING
To avoid injury to yourself, fellow workers, or damage to property from
release of process fluids, ensure that all pressure is removed from the
valve both upstream and downstream before disassembly.
•
Loosen the gland nut (10) and remove the gasket (9) and the bonnet
bolt (11). Lift the gland (8) to tie and secure it with string or wire.
(See Figure 1).
•
Use a suitable tool to remove the existing packing ring (3). Do not
scratch or damage the surface of the stem or packing with tools.
Next tie the loose packing rings (3) with string or wire
(see Figure 1).
•
Check that the stem and packing are intact. Any burrs and scratches
should be removed with emery cloth. Clean the valve stem with a
cloth soaked in solvent.
•
Count the original number of packing rings.
•
If replacing with new packing, use a sharp tool to cut each ring
at a 45° angle (see Figure 2), stagger adjacent packing openings
90°–120° into the bonnet packing groove. (See Figure 3).
Tamp each ring when installing.
•
After the packing groove is filled with the packing rings, reassemble
the gland, gland nuts (10), washers (9) and bonnet bolts (11).
Alternately tighten the gland nuts (10) one quarter turn at a time
until the gland nuts (10) begin to tighten.
•
Open and close the valve with handwheel (12). The action should be
smooth throughout the stroke. Adjust the tightness of the packing by
adjusting the gland nut. If the packing leaks, turn the gland nut (10)
evenly in 1/4 turn increments until it stops.
(10)
8. If
leak
).
f the packin
k stops.
ng leaks, turrn the gland
d nut (10) eevenly in 1//4 turn increements until the
Figure 1
Stem packing replacement
(10)
8. If
leak
).
f the packin
k stops.
ng leaks, turrn the gland
d nut (10) eevenly in 1//4 turn increements until the
Figure 2
(10)
8. If
leak
).
f the packin
k stops.
ng leaks, turrn the gland
d nut (10) eevenly in 1//4 turn increements until the
Figure 3