Recommended Spare Parts Replacement
Follow these steps to replace the recommended spare parts in this actuator.
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.
1. Remove the actuator from the valve as described in the ACTUATOR REMOVAL Section of this
Instruction.
2. Scribe corresponding lines on the actuator cover and housing, then remove the four screws and
lift the dial cover (outer ring) and cover from the actuator.
Note: It may be necessary to drive a chisel between the cover and actuator housing to loosen the cover.
3. Note the position of the gear sector in in the housing, then lift the gear sector out of the actuator.
4. Remove the pipe plug in the side of the housing that lines up with the worm gear pin.
5. Using a pin punch, reach in thru the hole where the pipe plug was, drive out the pin connecting
the worm gear to the actuator drive shaft. Take the pin out of the housing.
6. Slide the drive shaft (complete with operator) out of the actuator.
7. Reach into the housing and remove the worm gear, thrust bearing(s) and bearing races. The
Size 6 actuator has one thrust bearing and two bearing races; the Size 12 has two bearings and
four bearing races.
8. Remove the gear sector seals from the top cover and adaptor.
9. Remove the drive shaft seal from the housing.
10. Scrape the old gasket material from the top cover and the actuator housing.
11. Grease the new seals and press them into the top cover and adaptor.
12. Push a new drive shaft seal into the housing.
13. Size 6 Actuators – Slide the drive shaft into the housing and thru these components in the
following order: bearing race, bearing, bearing race, worm gear and then into the bearing in the
housing.
Size 12 Actuators - Slide the drive shaft into the housing and thru these components in the
following order: bearing race, bearing, bearing race, worm gear, bearing race, bearing, bearing
race and then into the bearing in the housing .
14. Turn the drive shaft and worm gear until the holes in them line up with the pipe plug hole in the
housing.
15. From the large opening in the gear housing, insert the pin into the worm gear and hammer it in
thru the worm gear and shaft until flush with the worm gear.
16. Screw the pipe plug into the hole in the housing.
May 2020
LIFT, TURN AND RESEAT G-SERIES ACTUATORS USE ON
Page 7
PTW & PFW TAPERED PLUG VALVES
DeZURIK
D10189
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