Page A3
III. MAINTENANCE
Some periodic maintenance of this product is required as
specified in the following subsections.
A. LUBRICATION
This valve has been lubricated at the factory with lithium and
silicone based lubricants. Ensure lubricant to flow media
compatibility prior to start-up. If lubricant is not compatible
with flow media, disassemble the valve and lubricate with
flow media compatible lubricants.
This valve does not require routine maintenance lubrication.
Lubrication is necessary only when valve has been
disassembled to inspect or replace components.
After the supply air pressure is released, observe the valve
position. The valve should be in the open position for direct
acting or in the closed position for the reverse acting. If the
actuator fails to return to the correct position, check for
obstacles that may be jammed between the plug and seat.
B. ADJUSTMENTS
If packing leakage occurs, turn the packing gland clamp nuts
clockwise only until packing leakage stops; do not continue
turning after leakage stops. If packing leakage cannot be
stopped by turning the packing gland clamp nuts clockwise,
the packing must be replaced.
After the supply air pressure is released, observe the valve
position. The valve should be in the open position for direct
acting or in the closed position for the reverse acting. If the
actuator fails to return to the correct position, check for
obstacles that may be jammed between the plug and seat.
C. PACKING REPLACEMENT
During this procedure, you may come in contact with process
fluids, wear adequate protection to protect yourself from the
process fluid.
See Figure 2, Page A4 for parts identification.
1. Depressurize and drain the process line.
2. Remove the actuator from the valve as described in the
ACTUATOR REMOVAL Section of the Actuator
Instruction manual.
3. Slowly and evenly remove the two nuts holding the
packing gland clamp in place.
4. Remove the two nuts that secure the actuator yoke
(shown in Figure 9, Ref. B32) to the valve body, then lift
the yoke and packing gland clamp off the valve. Leaving
the ball bearing in the yoke.
5. Slide the gland off the valve shaft.
6. Remove and discard the packing from the valve body. It
is not necessary to remove the metal backup ring in the
bottom of the packing chamber. Ensure that the shaft
and packing bore are clean and smooth. If a scarred
shaft or packing bore are present, replace the damaged
parts.
7. Slide the new packing, one piece at a time, down the
valve shaft and into the packing chamber. Use the
sequence shown in Figure 3, Page A5. Use the packing
gland to seat each packing ring one at a time. Be sure to
use a compatible lubricant with each piece of packing as
required.
8. Slide the gland and packing gland clamp down the valve
shaft until the gland contacts the packing.
9. While holding the packing gland clamp inside of the
actuator yoke (not shown in Figure 2, Page A4), slide the
packing gland clamp and yoke onto the valve shaft so
the slots in the packing gland clamp slide over two of the
studs. Install yoke nuts and tighten.
10. Screw packing nuts onto the studs to hold the packing
gland clamp down; tighten the nuts finger tight plus 1/2
turn. They will be re-tightened after the valve is
pressurized.
11. Mount the actuator on the valve as described in the
ACTUATOR INSTALLATION Section of the Actuator
Instruction Manual.
12. After the valve is pressurized, turn the gland clamp nuts
clockwise only until packing leakage stops; do not
continue turning after leakage stops. If packing leakage
cannot be stopped by turning the gland clamp nuts
clockwise, the packing must be replaced.
WARNING
UNLESS OTHERWISE SPECIFIED THIS
VALVE HAS BEEN LUBRICATED AT THE
FACTORY WITH LITHIUM AND SILICONE
BASED LUBRICANTS THAT MAY NOT BE
COMPATIBLE WITH YOUR FLOW MEDIA.
ENSURE LUBRICANT COMPATIBILITY PRIOR
TO START-UP. FAILURE TO DO SO MAY
RESULT IN PERSONAL INJURY AND/OR
EQUIPMENT DAMAGE.
