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Instruction Manual
Form 5062
May 2008
34.9
(1.375)
13A6773-A
A1739-4 / IL
Figure 4. Lever Operating Clearance
Loading Connection
1. Connect the loading pressure piping to the
pressure connection in the top of the diaphragm
casing.
a. For size 40 through 60 actuators: Run either
1/4 NPT pipe or 3/8 inch tubing between the
1/4 NPT pressure connection and the instrument.
b. For size 70 actuators: Run either pipe or
tubing between the pressure connection and the
instrument. If necessary, remove the 1/4 inch
bushing in the pressure connection to increase
connection size.
2. Keep the length of pipe or tubing as short as
possible to avoid transmission lag in the control
signal. If an accessory (such as a volume booster or
a valve positioner) is used, be sure that the
accessory is properly connected to the actuator. If a
valve positioner is part of the assembly, the pressure
connection to the actuator will normally be made at
the factory.
1.6
OPERATING CLEARANCE
(0.0625)
mm
(INCH)
1051 & 1052 F & G Actuators
Table 4. Wrench Size Required for Turnbuckle
Adjustment, Inches
ACTUATOR
Type
Size
1051 &
40
1052
60
1052
70
3. When the control valve is completely installed
and connected to the instrument, check for correct
action (air-to-open or air-to-close) to match the
controlling instrument. For successful operation, the
actuator stem and valve shaft must move freely in
response to the loading pressure change on the
diaphragm.
Adjustment
Turnbuckle Adjustment
Correct turnbuckle adjustment ensures that the valve
is correctly closed when the actuator is against its
travel stops. The turnbuckle adjustment is the only
adjustment necessary on the Type 1051 actuator.
Key numbers are shown in figure 8 for Type 1051
actuators and in figure 9 for Type 1052 actuators.
For accurate adjustment to the zero-degree valve
disc or ball position, remove the valve from the
pipeline. Refer to the valve instruction manual for
instructions.
A regulated air supply will be required to stroke the
actuator. Refer to table 4 for the sizes of the three
open-end wrenches required for this procedure.
1. Remove the access plate (key 59). Also remove
the machine screws (key 60), if present.
For the most accurate adjustment of
the actuator, do not remove the cover
(key 33) during this procedure.
2. Loosen the lower locknut (key 16).
3. Make sure the actuator housing (key 20) is clear
of any tools or other instruments that could obstruct
the actuator stroke path. Pressure the diaphragm
casing enough to stroke the actuator down so that
the left-hand threaded upper locknut (key 58) is
accessible through the access opening. Loosen the
locknut.
4. Consult the appropriate valve instruction manual
for determining the closed position of the valve.
Then use one of the following:
TURN-
LOWER
UPPER
BUCKLE
BUCKLE
LOCKNUT
LOCKNUT
LOCKNUT
LOCKNUT
(KEY 57)
(KEY 16)
(KEY 58)
1-1/8
3/4
1-1/8
1-5/16
15/16
1-5/16
1-5/16
1-1/8
1-5/16
Note
7
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