DeZurik LA-6 Instrucción - Página 4
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LA-Series Manual & Electric Actuators
Description
The LA-Series Actuator has a fully-enclosed compound link mechanism that is available in
weatherproof or buriable models with internally adjustable stops.
The actuator is sized for the valve and shutoff pressure specified. Consult the factory for sizing
information if the actuator is used for other applications.
The actuator conforms to the applicable requirements of ANSI/AWWA Standard C504.
Manual Operation
The manually operated actuator can be driven by a handwheel, chainwheel or a 2-inch nut. It is also
available with a 2:1 spur gear drive. The actuator is designed for a 450-foot-pound input against the
stops (without the spur gear), and 300 foot pounds with the spur gear.
Clockwise rotation of the actuator input shaft closes the valve. The number of actuator turns required to
move the valve the 90 degrees from one position to the other is as follows:
MODEL
W/O Spur Gear With Spur Gear
LA-4
34 turns
LA-6
50 turns
LA-10
84 turns
Electric Operation
The motor-driven actuator has a keyed input shaft and is available with or without the spur gear drive.
Required Tools
The actuator is assembled with SAE fasteners. Tools required for disassembly, assembly and
adjustment include a set of combination wrenches, a flat-tipped screwdriver, Allen wrenches, a pin
punch, a file and a hammer.
Lubrication
The actuator does not require lubrication for routine maintenance. If the actuator is disassembled,
however, lubricate all of the bearing, sealing and threaded surfaces of the components listed below with
EXXON Unirex EP 2 Premium lubricant (no alternate) during assembly. See Figures 1 and 2 for parts
location.
•
Actuator input shaft, O-ring and bearings
•
Input shaft threads
•
Collars
•
Both stop nuts
•
Inner thrust washers, both sides
•
Guide nuts
•
Guide bars
•
Yoke nut
•
Bearing and O-ring where valve shaft enters actuator housing
After the actuator is fully assembled, apply a layer of lubricant approximately 1/2" thick to the above
surfaces that are accessible inside the housing. For buried service, continue to apply lubricant until the
housing is 90% filled.
D10308
68 turns
100 turns
168 turns
Page 4
March 2009