DeZURIK
MANUAL G-SERIES ACTUATORS FOR USE WITH PTW & PFW TAPERED PLUG VALVES
Description
The Manual G-Series Actuator is designed to operate PTW and PFW Tapered Plug valves.
Note: Valves equipped with this actuator do not provide dead-tight shutoff.
Operation
To operate the actuator, turn the operator (handwheel or chainwheel) to rotate the plug to the desired
position. Clockwise rotation of the operator moves the valve plug in the clockwise direction.
Tools Required
This actuator is assembled using only standard SAE fasteners. To service this unit, you should have a
full set of combination wrenches, Allen wrenches, several flat tipped screwdrivers and a dead blow
hammer.
Lubrication
This unit requires no additional lubrication unless disassembled. If disassembled, apply a medium
aluminum complex based lubricant to the bearings, gear sector teeth and worm gear using one of these
lubricants:
•
Keystone Zeniplex-1 (recommended)
•
Amoco Amolith Grease #1-EP (alternate)
•
Amsoil GHD (alternate)
•
Mobil Mobilux EP 1 (alternate)
•
Petro-Canada Vultrex MPG EP 1 (alternate)
•
Shell Alvania EP 1 (alternate)
•
Texaco Multifak EP 1 (alternate)
Stops
Valves ordered for 360° plug rotation (Combination Number 0) are not furnished with stops.
Valves ordered for 90°, 180° or 270° plug rotation (Combination Numbers 1 thru 4) have stops to limit
valve travel in both the CIockwise and counterclockwise directions. These stops have been adjusted at
the factory to coincide with the Combination Number specified on the purchase order and do not
require adjustment unless the Combination Number is changed, or if the actuator has been
disassembled. See the STOP ADJUSTMENTS Section of this Instruction for details on adjusting the
stops.
Stop Adjustments
The two stops are spacers and screws located in the actuator cover. When the pointer contacts one of
the stops, the valve quits traveling in that direction.
The two stop adjustments are directly related; changing one stop will change the other stop the same
amount. To adjust the stops, follow these steps.
1. Loosen -DO NOT REMOVE - the four screws holding the cover dial in place.
2. Turn the operator until the pointer pushes against the stop, then continue turning the operator
until the desired stop position is obtained. The pointer should be either perpendicular or parallel
with the pipeline.
D10192
Page 4
August 2012
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