Leslie Controls CONTROL VALVES DLOS-2 & DDLOS-2 (150/300) - Manual (Page 5)

5
LAMINATED GRAPHITE PACKING
Packing tools are available from Leslie Controls
and should be used to insure proper installation
of packing. Packing tool reference numbers are
shown on Dwg. 10/0.5.9, which also shows how
to make the tools.
Figure 6 - Installation Sequence
INSTALLATION
Place spacers and packing rings over stem and
into packing box in order shown on drawing, one
at a time, seating each firmly and using care not
to tear rings on the stem threads. Adjust packing
gland nuts equally-finger tight plus 1/6 turn (one
flat of nut).
ADJUSTMENT
During start-up some leakage may be observed.
Do not readjust packing-allow at least 15
minutes for pressure/temperature stabilization to
occur. If leakage continues adjust a maximum of
1/6 turn at a time. If pressure is raised
considerably, the packing may leak slightly. Do
not readjust-leakage will stop when new
pressure/temperature stabilization is reached.
BREAK-IN
For best results it is recommended that after
packing installation and adjustment the valve be
fully stroked approximately 20 times to break-in
the packing and reduce stem friction.
DISASSEMBLY OF ACTUATOR FROM
VALVE BODY ASSEMBLY
(See Fig. 6, 6A, 7 and 9 in Appendix)
1.
Close inlet and outlet stop valve and relieve
all pressure from piping involved. Remove
all compression from adjusting spring(s).
2.
NORMALLY OPEN VALVES-DLO(S)-2.
Relieve air pressure from diaphragm of
actuator. Remove the tubing from upper
diaphragm case.
3.
NORMALLY CLOSED VALVES-
DDLO(S)-2. Supply sufficient air to the
actuator diaphragm to keep valve plug from
touching seat while disengaging valve plug
stem from actuator stem.
4.
Loosen valve stem nut. Use wrench on plug
stem flats and turn valve plug out of actuator
stem until stems separate. Remove the
tubing from lower diaphragm case.
5.
Remove cap screws holding actuator to
bonnet and lift off actuator.
DISASSEMBLY
VALVE BODY
SUBASSEMBLY (VBSA)
(See Fig. 6 and 6A in Appendix)
1.
Remove actuator from VBSA as previously
described in Disassembly of Actuator from
Valve Body Subassembly.
2.
Remove bonnet nuts (10). Also bolts (11)
for DLOS only.
3.
Lift bonnet assembly including valve plug
(2) from valve body (1).
4.
Remove valve plug (2), packing bearing
(12) and old packing set (17). Include
spring (15) for Teflon packing set.
WARNING
Injury or death can occur due to failure to
completely isolate valve from all sources of
pressure before beginning disassembly. Do not
proceed until valve has been completely isolated
from the process and vented to atmosphere.