DeZURIK
G-Series Cylinder Actuator Used on BAW Butterfly Valves
Reassembling Actuator
11. Apply a thin bead of silicone sealant Dow RTV-732 to the stop cap (B29) and attach it to the
housing (B1) with screws (B23), nuts (B24) and lockwashers (B28).
12. Apply a thin bead of silicone sealant Dow RTV-732 to the cover (B2). Line up the scribe marks
on the cover and housing (B1) and attach the cover with screws (B13).
13. Attach the pointer (B17) to the gear (G3) with screws (B18) pointing to the open position mark
on the cover (B2).
14. Adjust the open and closed position stops described in the "Adjusting Position Stops" section.
Changing Mounting Positions
The actuator can be mounted in 90° increments around the valve shaft.
1. Discontinue flow, relieve pipeline pressure and close valve.
Accidental operation of power actuator can cause personal injury or equipment damage.
Disconnect and lock out power to actuator before servicing.
2. Remove the actuator from the valve. See "Removing Actuator" section.
3. Rotate the actuator to the desired position.
4. Install the actuator on the valve. See "Installing Actuator" section.
Troubleshooting
Condition
Actuator closes to wrong
position
Actuator opens to wrong
position
Actuator will not fully operate
valve
Actuator rotates wrong
direction
D10480
(Continued)
Possible Cause
Closed position stop is set
incorrectly
Open position stop is set
incorrectly
Cylinder pressure is low
Piston seal in cylinder is leaking
Pipeline obstruction in valve is
preventing closure
Air connections to cylinder are
incorrect
Page 12
Corrective Action
Adjust closed position stop. See
Adjusting Position Stops section
Adjust open position stop. See
Adjusting Position Stops section
Increase cylinder pressure. Do
not exceed 100 psi (69 kPa).
Replace piston seal(s). See
Cylinder instructions.
Remove obstruction
Reverse air connections to
cylinder
August 2012
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