Instruction Manual
D100331X012
1066 and 1066SR F & G Actuators
October 2012
8
If rotation of either set screw seems difficult, apply lithium grease lubricant (key 35) to the threads of each set screw as
shown in figures 5 and 6.
Figure 3. Mounting Yoke Detail
TRAVEL
INDICATOR
SCALE (KEY 21)
48A4468-C
TRAVEL
INDICATOR
SCALE (KEY 21)
MOUNTING
YOKE (KEY 25)
BEARING
(KEY 4)
BEARING (KEY 4)
STYLES A AND D
(STANDARD CONSTRUCTION)
STYLES B AND C
(REVERSE CONSTRUCTION)
Principle of Operation
1066 Actuators: Piston movement is accomplished by loading air pressure on one side of the piston (key 3, figure 4),
while unloading air pressure from the other side. The piston moves a lever (key 10) to open or close the valve. Use
either a positioner, a loading solenoid, a four-way switching valve, or two three-way valves to operate the actuator.
Actuators equipped with either the wrench override option or with a 1078 handwheel can manually position a control
valve without using supply or instrument air pressure. Be sure to open the cylinder bypass valve to equalize pressure
before manually operating the valve/actuator assembly.
1066SR Actuators: Piston movement is accomplished by loading air pressure on top of the piston (key 3, figure 5) to
move the piston down. This action compresses the spring. If loading pressure is decreased or removed, spring
compression moves the piston to the top of the cylinder. The piston moves a lever (key 10) to open or close the valve.
Use either a positioner, a loading solenoid, or a switching valve to operate the actuator.
Maintenance
Instructions are given in this section for replacing the cylinder O-ring, the cylinder gasket, the lever/bearing assembly,
and other parts. Key numbers are shown in figures 6 and 7 unless otherwise noted.
WARNING
Avoid personal injury from sudden release of process pressure or uncontrolled movements of parts. Before performing any
maintenance operations:
D
Do not remove the actuator from the valve while the valve is still pressurized.
