DeZURIK
20.5 - 36" PEC Eccentric Valves
D10032
Page 10
April 2015
Packing Replacement
(continued)
3. Remove the packing gland nuts from the studs, and slide the packing gland up the stem of the
plug.
4. Remove the studs from the bonnet.
5. Cut and completely remove all of the old packing from the packing chamber in the bonnet.
6. Cut each new packing ring radially in one place with a razor-sharp knife.
7. Place each new packing ring—one at a time with the joints staggered—around the plug and into
position in the packing chamber.
8. Replace the studs in the bonnet.
9. Push the rings down into position with the packing gland, and replace the packing gland nuts on
the studs.
10. Turn the packing gland nuts onto the studs until they touch the packing gland, then one more
turn.
11. Restore the pipeline pressure if it was relieved, and check for packing leakage. If leakage
occurs, tighten each packing nut just enough to stop the leakage. Excessive tightening will
cause reduced packing life and higher valve operating torque.
Disassembly
This valve is a pressure vessel. The bonnet will blow off the body if the bonnet
bolts are removed with pressure in the valve. Pressure must be completely released
before disassembly.
Follow these steps to disassemble valve:
1. Relieve pipeline pressure and close the valve.
Moving parts from accidental operation of power actuator can cause personal injury
or equipment damage. Disconnect and lock out power to actuator before servicing.
2. If the actuator is powered, disconnect and lock out the pneumatic, hydraulic, or electrical power
to prevent accidental operation of the actuator.
3. If desired, remove the valve from the pipeline.
Note:
The valve can be disassembled while still in the pipeline.
