DeZURIK
2---16" PTW & PFW Tapered Plug Valves
D10188
Page 8
April 2015
Disassembly
Follow these steps to disassemble valve:
This valve is a pressure vessel. The bonnet will blow off the actuator if the bonnet bolts
are removed with pressure in the valve. Pressure must be completely released before
disassembly.
1. Relieve pipeline pressure.
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. Scribe a line on the actuator, body & bonnet for alignment when reassembling.
4. Remove the valve from the pipeline (if desired).
Note:
The valve can be disassembled while still in the pipeline.
When a tapered plug 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.
5. Remove actuator from valve—see Actuator Instructions.
6. Note the orientation of the plug in relationship to the valve ports. (See Figure 2 for markings.)
Figure 2—Plug Stem Markings
7. Remove the bolts that hold the bonnet in place, then pry the bonnet loose from the valve body.
8. Remove the plug from the valve body.
9. Remove the gland nuts and gland from the bonnet.
10. Remove the packing from the bonnet.