DeZURIK
2---16" PTW & PFW Tapered Plug Valves
D10188
Page 6
April 2015
Fusion/Powder Coated Valves
Valves with fusion/powder coated exterior paint require flat washers to be installed
under the flange nuts when installing the valve to the pipeline flange to prevent the
paint from cracking or chipping.
Packing Adjustment
All standard tapered plug valves feature adjustable stem seal packing. If a stem seal packing leak
should occur, tighten the gland nuts evenly just until the leakage stops.
Note:
Do Not continue tightening after leakage stops. If packing leakage cannot be stopped by tightening
the gland nuts, the packing must be replaced.
Plug Clearance Adjustment
On valves not utilizing a Lift, Turn, Reseat actuator, the seat/plug clearance can be adjusted by
removing the locknut and wrenching square from the top of the valve, then turning the plug adjusting
nut to change the seat/plug clearance. Turning the nut clockwise will increase the clearance between
the seat and plug; turning the nut counterclockwise will decrease the clearance. Recommended seat
plug clearance is .030" for paper stock and .010" for all other applications.
Packing Replacement
Follow these steps to replace the packing with the actuator removed:
1. Discontinue pipeline flow and relieve pipeline pressure.
2.
Scribe the actuator and valve bonnet for alignment when reassembling.
Moving parts from accidental operation of power actuator can cause personal injury or
equipment damage. Disconnect and lock out power to actuator before servicing.
3. If the actuator is powered, disconnect and lock out the pneumatic, hydraulic, or electrical power
to prevent accidental operation of the actuator.