DeZURIK
20.5 – 36" PEC Eccentric Valves
April 2015
Page 11
D10032
Disassembly
(continued)
When an eccentric valve is mounted in a vertical pipeline— or mounted in a horizontal
pipeline with the plug stem horizontal—gravity can cause the plug to swing to a lower
position in the valve body when the actuator is removed. Place the plug in the lowest
position before removing the actuator.
4. Remove actuator from valve—see Actuator Instructions.
5. Scribe a line on the body, bonnet and plug stem to help align these parts during re-assembly.
6. Remove the bolts that hold the bonnet in place, then pry the bonnet loose from the valve body.
7. Remove the plug.
8. Remove the gland nuts and gland from the bonnet.
9. Remove the packing from the bonnet.
10. Reaching through the packing chamber in the bonnet, drive the upper bearing out of the bonnet
using a hammer and pin punch.
11. Remove the lower journal cover from the body and drive the lower bearing out using a hammer
and a punch pin.
Reassembly
1. Push a new lower bearing into the valve body, then lubricate the bearing. See “L
ubrication” section
.
2. Replace the journal cover on lower bearings and tighten screws.
3. Place the plug into the valve body so the lower journal slides into the bushing.
4. Turn the plug so it is nearly closed.
5. Set a new gasket in the body.
6. Push a new bearing into the bonnet, then lubricate the bearing. See "Lubrication" section.
7. Align the scribe marks in the bonnet and plug stem, then install and tighten the bonnet bolts.
8. Place the plug to the closed position. See "Closed Position" section.
9. Install the packing one ring at a time. See Figure 3.
10. Install the packing gland and nuts.
11. Tighten the gland nuts finger tight plus ½ turn.
Note:
This is a preliminary adjustment, it will be necessary to adjust the packing gland nuts after
the valve is pressurized. See "Packing Adjustment" section.
12. Install the actuator—see Actuator Instructions.
13. After pipeline flow is restored, check the packing for leakage.
Note:
If packing leaks, tighten the packing gland nuts only enough to stop the leak. Over tightening the
packing will cause premature packing failure and higher valve operating torque.
14. If the actuator is a powered actuator, reconnect power to the actuator.
