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WORM GEAR
Installation, Maintenance,
& Operation Manual
SETTING ADJUSTMENT SCREWS
1. Rotate the handwheel to move the valve to the fully closed position. Set the adjustment screw by
turning it clockwise until you feel it hit the segment inside the gear then lock the adjustment screw by
using the lock nut provided.
2. Rotate the handwheel to move the valve to the fully open position.
If the valve is installed and you cannot see if the valve is fully open, you can count the
number of rotations of the handwheel to make sure you reach 90 degrees.
Ex: (if your gear has a 100:1 ratio. You would rotate your handwheel 25 times to reach 90 degrees)
3. Set the adjustment screw by turning it clockwise until you feel it hit the segment inside the gear. Lock
the adjustment screw by using the lock nut provided.
Note: Due to the differences in individual valves, the indicator may not line up exactly with the
open/closed markings on the cover. Proper settings must be determined by the position of the
valve disc, ball, plug, etc.
SAFETY &OPERATION
Do not use handwheels, cheater bars, or motors devices larger than recommended by
the factory. This could cause damage to the gear operator or possibly the valve and
will void the manufactures warranty.
Gear operators are sized based on torque information provided by valve manufactures. Over time
some applications may cause the valves to become more difficult to operate. If the operator becomes more
difficult to operate,check the following:
Does the gear have proper lubrication? Some valve applications like plug valves also need lubrication if this is the
case also check that the valve has proper lubrication.
Make sure the valve is clear of any obstructions.
Check to see if the pressure across the valve has changed. This could have an adverse effect on the valve torque.
Phone: 713.590.0270 Fax: 713.590.0278 Toll Free: 1.877.811.4258
13750 Hollister Road Houston, Texas 77086
www.diamond-gear.com
