Emerson Process Management 1051 - Manual (Page 18)

Instruction Manual
D100320X012
1051 and 1052 H & J Actuators
October 2012
18
b. Pull the diaphragm plate (key 4) and attached parts out of the actuator. The spring (key 11), diaphragm rod (key
10), cap screw (key 9), spring seat (key 13), hex nut (key 58), turnbuckle (key 57), hex nut (key 16), and rod end
bearing (key 17) will be attached to the diaphragm head.
WARNING
For 1051 actuators, the diaphragm plate (key 4) may be wedged against the diaphragm rod (key 10), thereby preventing
the spring compression from being relieved as the cap screw (key 9) is loosened. Dislodge the diaphragm head from the
diaphragm rod by loosening the cap screw (key 9) one full turn and tapping the underside of the diaphragm head until it
follows the cap screw disassembly. Failure to check for this situation before removing the cap screw (key 9) could cause
personal injury due to the sudden release of spring compression as the cap screw is disengaged.
c. Slowly remove the cap screw (key 9) while making sure that the diaphragm head is following the cap screw
removal. Note that spring load will be zero before the cap screw is completely removed. Then separate the
remaining parts of the assembly.
For 1052 actuators,
a. Remove the rod end bearing (key 17), the hex nut (key 16), the turnbuckle (key 57), and the hex nut (key 58)
from the diaphragm rod (key 10).
b. Pull the diaphragm plate (key 4) and attached parts out of the actuator. Then remove the cap screw (key 9) to
separate the diaphragm plate and the diaphragm rod.
c. Proceed as appropriate:
D For actuator designs without a set screw in the spring barrel (key 12), remove the actuator spring (key 11) from the
actuator. If it is necessary to remove the adjustor (key 74) from the spring barrel during this procedure, heat the
base of the adjustor to 177_C (350_F) long enough for the thread locking adhesive (high strength) (key 77) to lose
its holding strength. Then, unscrew the adjustor from the spring barrel. If the spring seat and the lower bearing seat
(key 13 and 73) are to be replaced, unscrew the lower bearing seat from the adjustor, and then remove the thrust
bearing and the bearing races (keys 71 and 72) from the lower bearing seat.
D For actuator designs with a set screw, (key 75), remove the actuator spring (key 11) from the actuator. If the spring
seat and the lower bearing seat (keys 13 and 73) are to be replaced, unscrew the lower bearing seat from the
adjustor, and then remove the thrust bearing and the bearing races (keys 71 and 72) from the lower bearing seat. If
it is necessary to remove the spring adjustment parts, heat the set screw (key 75) to 177_C (350_F) long enough for
the thread-locking adhesive (high strength) (key 77) to lose its holding strength, and then loosen the set screw (key
75). Unscrew the spring adjustor (key 74) from the spring barrel (key 12).
Assembly
This procedure assumes that the actuator is completely disassembled. If the actuator is not completely disassembled,
start these instructions at the appropriate step. Key numbers used are shown in figure 12 for 1051 actuators and in
figure 13 for 1052 actuators.
1. If the 1052 spring barrel (key 12) was removed from the housing (key 10), align the spring barrel to the housing as
described below to ensure that the offset hole in the base of the spring barrel is located properly.
For size 40 and 60 actuators, note that one of the accessory mounting bosses on the spring barrel is closer to the
diaphragm end of the spring barrel. Place the spring barrel on the housing with the upper boss (the one closer to the
diaphragm end) on the same side as the boss located on the housing (see figure 13). This ensures proper positioning of
the offset hole. Secure the spring barrel with the cap screws (key 21).