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1051 & 1052 F & G Actuators
actuator and lead to possible personal
injury or property damage.
5. Refer to figure 4 for the desired orientation of the
housing (key 20). Secure the housing to the
mounting yoke with cap screws (key 23).
6. Coat with lithium grease (key 93) on the cap
screw threads (key 9), and the tapered end of the
diaphragm rod (key 10).
7. Proceed as appropriate:
a. For Type 1051 actuators (see figure 8)
D Assemble the diaphragm rod, spring seat
(key 13), spring (key 11), and diaphragm plate
(key 4), and secure with the cap screw (key 9).
Tightening the cap screw will compress the spring.
Be certain the tapered end of the diaphragm rod is
seated in the corresponding hole in the diaphragm
plate, that the spring is seated in the spring seat,
and that the cap screw is tightened to the torque
specified in table 3.
D Install the hex nut (key 58), turnbuckle (key 57),
hex nut (key 16), and rod end bearing (key 17) onto
the diaphragm rod.
D Be certain the travel stops (key 8) are located
as shown in figure 5.
D Install the diaphragm plate and attached parts
into the actuator.
D Be sure the warning nameplate (key 56) is in
place. Install the diaphragm (key 3) and the upper
diaphragm casing (key 1). Install the cap screws and
hex nuts (keys 5 and 6). Tighten the cap screws
evenly in a crisscross pattern to compress the spring
and secure the upper diaphragm casing. Refer to
table 3 for torque values.
b. For Type 1052 actuators (see figure 9):
D For actuator designs without a set screw
(key 75) in the spring barrel (key 12): if the adjusting
screw and attached parts were removed, first clean
and then lubricate the upper threads of the adjusting
screw (key 74) with lithium grease (key 76) as
shown in figure 9. Install the lower bearing seat (key
73), the thrust bearing (key 71), the thrust bearing
races (key 72), and the spring seat (key 13) onto the
adjusting screw.
D First, clean and then coat the lower end of the
adjusting screw with sealant (key 77) or equivalent
12
thread-locking compound as shown in figure 9, and
install the entire assembly into the spring barrel
(key 12). Let the adjusting screw stand undisturbed
for at least two hours after installation to allow the
thread-locking compound to cure.
CAUTION
Apply lubricant to the upper threads
and thread-locking compound to the
lower threads of the adjusting screw.
Do not overlap the coat of lubricant
with the coat of thread-locking
compound since this will adversely
affect the performance quality of both
substances.
D For actuator designs with a set screw (key 75),
if the adjusting screw (key 74) and attached parts
were removed, lubricate the threads of the adjusting
screw with lithium grease (key 76). Install the lower
bearing seat (key 73), the thrust bearing (key 71),
the thrust bearing races (key 72), and the spring
seat (key 13) onto the adjusting screw. Install this
assembly into the spring barrel (key 12). Secure the
adjusting screw with the set screw (key 75).
8. Coat the tapered end of the diaphragm rod
(key 10) and the threads of the cap screw (key 9)
with lithium grease (key 76). Bolt the diaphragm
plate to the diaphragm rod.
9. Be certain the travel stops (key 8) are located as
shown in figure 5.
10. Install the spring (key 11) into the spring barrel.
Install the diaphragm plate and diaphragm rod into
the actuator. Attach the hex nut (key 58), turnbuckle
(key 57), hex nut (key 16), and rod end bearing
(key 17) to the diaphragm rod.
11. Installing the diaphragm:
D Install the diaphragm (key 3) and place the
upper diaphragm casing (key 1) onto the lower
diaphragm casing (key 2). If necessary, rotate the
lower bearing seat (key 73) so that the upper
diaphragm casing travel stop will not contact the
diaphragm when the casing cap screws and nuts
(key 5 and 6) are tightened.
D Secure the upper diaphragm casing with the
cap screws and hex nuts (keys 5 and 6). Be sure the
warning nameplate is in place on the casing. Tighten
the nuts on the cap screws to the torque value
shown in table 3.
12. For Type 1052 actuators, complete the Initial
Setting portion of the 1052 Spring Adjustment
section before proceeding.
Instruction Manual
Form 5062
May 2008
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