DeZURIK
MANUAL G-SERIES ACTUATORS FOR USE WITH PTW & PFW TAPERED PLUG VALVES
Actuator Installation
1. Place the valve plug in the position noted in ACTUATOR REMOVAL.
2. Line up the scribe marks made during actuator removal, then set the actuator on the valve so
the valve shaft slides into the actuator gear sector. Fasten the actuator to the valve.
3. Slide the bearing washer down the stud sticking out the top of the actuator, then screw the plug
adjusting nut down the stud until it touches the bearing washer.
4. Turn the plug adjusting nut clockwise until there is .010" clearance between the plug face and
the body seat. If the valve is used for paper stock, the clearance should be .030".
Note: The holes in the bearing washer must line up with the tapped holes in the top of the gear
sector.
5. Set the pointer on the bearing washer so it fits down over the plug adjusting nut, then turn it until
it is positioned as noted during ACTUATOR REMOVAL. Fasten the pointer to the gear sector
with the two shorter socket head screws.
6. Set the wrenching square on the pointer and fasten it to the gear sector with the four remaining
socket head screws.
7. Screw the nut on the stud until it contacts the wrenching square. Tighten the nut to lock the
assembly into place.
8. Check the stop settings and readjust if necessary. The correct adjustment procedure is
described in the STOP ADJSTMENTS Section of this Instruction.
9. Pipeline flow and pressure may now be restored.
Bearing and Seal Replacement
As with any rotating seal, the seals in this actuator are subject to wear and will require replacement
should leakage occur. At the time of seal replacement it is also recommended that the gear sector
bearing also be replaced.
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. Discontinue system flow and relieve pipeline pressure.
2. Scribe a line on the valve bonnet and actuator adaptor to use for alignment during actuator
installation.
3. Unscrew the nut from the top of the wrenching square.
4. Take out the four socket head screws and remove the wrenching square.
5. Note the position of the pointer, then remove the two socket head screws and slide the pointer
off the actuator.
6. Unscrew the plug adjusting nut from the stud and slide the bearing washer off the stud.
D10192
Page 6
August 2012
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