Section 4 - Maintenance - Emerson VANESSA 30,000 Series Installation, Operation And Maintenance Manual

VANESSA SERIES 30,000 TRIPLE OFFSET VALVE (TOV)
INSTALLATION, OPERATION AND MAINTENANCE MANUAL (IOM)

SECTION 4 - MAINTENANCE

WARNING
Depressurize the line before starting any
maintenance. Failure to do so may result in serious
personnel injury and/or equipment damage.
4.1 Packing box maintenance
If shaft leakage is observed through the packing
box, tighten the gland nuts slowly and evenly
until the leakage stops.
CAUTION
Do not over-tighten packing gland nuts. Over-
tightening will increase the torque required to
operate the valve.
When tightening the gland nut, use half-turn
increments until leakage stops.
Refer to figure 4.
To replace the packing rings proceed as follows:
1. Remove the gear/actuator and relevant
connecting keys (4f). Keep record of the
gear/actuator position in relation to the valve
position for a later correct re-assembly of the
gear/actuator.
2. Remove gland nuts (5d). If present, remove
bellevilIe springs (5n), and keep record of
their quantity and assembly configuration to
reassemble them correctly (point 7).
3. Remove packing gland flange (5f), anti blow-
out ring if present (5g), and gland bushing (5c).
4. Remove packing rings (5a). If the valve
features packing flush option, remove
lantern ring also (5h).
5. Carefully clean the packing cavity and
shaft (4a).
FIGURE 4
6. Apply a thin film of lubricant on each new
packing ring (5a) surfaces (lubricant should
be in accordance with Table 3). Insert new
packing rings, being mindful of inserting
the two braided rings at the bottom and top
of the entire packing. If the valve features a
packing flush option, insert the lantern ring
(5h) in the same original sequence (or as
indicated in figure 4). If the packing rings are
of the split type, install with splits staggered
at 180° from each other.
7. Reassemble packing bushing (5c), anti blow-
out ring if present (5g), and gland flange
(5f). If present, assemble the belleville
springs (5n), following the assembly
configuration noted in the previous point 2,
then assemble by hand the gland nuts (5d)
without tightening (after applying a thin film
of lubricant on the threads of the stud bolts,
in accordance with Table 3).
8. Reassemble keys (4f) on the upper shaft end.
9. Reassemble gear/actuator and close
the valve.
CAUTION
Do not force actuator on the shaft! This should be
a loose fit.
10. Tighten gland nuts (5d) in accordance to
Table 1 (Torque values for gland nuts).
11. Cycle the valve.
12. Pressurize again the line.
13. If a leakage is detected, tighten the gland nuts
slowly and evenly until the leakage stops.
6