Disassembly; Assembly; Parts Ordering - Emerson Fisher 1052 Instruction Manual

1052 Size 20 Actuator (H)
June 2017
by positioning the handwheel at the desired position. If the action is push‐down‐to‐open, full closing of the operated
equipment can be restricted by use of the handwheel.
Instructions are given below for complete disassembly and assembly required for inspection and parts replacement.

Disassembly

WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing (key 1, figure 4) away
from the actuator, relieve spring compression before diaphragm casing bolting is loosened.
1. Remove the upper diaphragm casing (key 1, figure 6) by following steps 1 through 4, and 6 of the Disassembly
portion of the Maintenance section.
2. Remove the cotter pin, hex nut, handwheel, and hex nut (keys 247, 54, 51, and 137). Unscrew the stem (key 133)
out through the actuator end of the handwheel body (key 142).
3. Remove the cap screws (key 141), and separate the handwheel assembly from the upper casing.
4. Check the condition of the O‐rings (keys 138 and 139); replace them if necessary.
5. If it is necessary to remove the pusher plate (key 135), drive out the groove pin (key 140).

Assembly

1. Before assembling, lubricate the threads of the stem (key 133) and the bearing surfaces of the stem and pusher
plate (key 135) with lithium grease (key 241).
2. If the pusher plate was removed, re-attach it to the stem, and drive in a new groove pin (key 140).
3. Apply lithium grease (key 241) to the O‐rings (keys 138 and 139). With the O‐rings in place, thread the stem into
the handwheel assembly.
4. Attach the handwheel assembly to the upper diaphragm casing (key 1, figure 6) with cap screws (key 141).
5. Install the hex nut, handwheel, hex nut, and cotter pin (keys 137, 51, and 247).
6. Install the diaphragm casing, making certain the warning tag is in place on the casing flange.
7. Tighten the cap screws (key 5, figure 6) evenly in a criss‐cross pattern to the torque shown in table 2.
8. Adjust the initial spring compression as described in the Spring Compression Adjustment section.

Parts Ordering

Each actuator has a nameplate attached to the actuator housing and a serial number stamped on it. Always refer to
this serial number when corresponding with your
replacement parts or technical information.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the
performance of the valve, and could cause personal injury and property damage.
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Emerson sales office or Local Business Partner regarding
Instruction Manual
D100323X012