DeZURIK
2---16" PTW & PFW Tapered Plug Valves
D10188
Page 10
April 2015
Reassembly
(Continued)
10. If the actuator is a powered actuator, reconnect power to the actuator.
11. 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.
Removing Valve from Pipeline
To remove the entire valve assembly from the pipeline, follow these steps.
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 and drain portion of system where valve is located.
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. Support the valve assembly, then remove the flange bolts.
4. Remove the valve from the pipeline.
Field Test
Stroke the valve between ports to verify that the valve and actuator are functioning properly.
Emergency Operation
Operate the valve as under normal conditions, taking care to bring the plug to the position required by
the particular emergency condition.
Predicted Wear of Parts
Length of service for parts subject to wear is dependent on service conditions.