Actuator - Emerson Fisher 667 30 Instruction Manual

Instruction Manual
D100310X012
D Vent the power actuator loading pressure and relieve any actuator spring pre‐compression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
The maintenance instructions are divided into several sections: Actuator, Top‐Mounted Handwheel Assembly
(Adjustable Down Travel Stop), Side‐Mounted Handwheel Assembly for Size 34/34i through 60/60i Actuators (Manual
Actuator), Side‐Mounted Handwheel Assembly for Size 70, 76 and 87 Actuators (Manual Actuator), and
Casing‐Mounted Travel Stops.

Actuator

This procedure describes how the actuator can be completely disassembled and assembled. When inspection or
repairs are required, disassemble only those parts necessary to accomplish the job; then, start the assembly at the
appropriate step.
Key numbers are shown in figures 6, 7, 8, 9, or 10, unless otherwise noted. Figure 6 shows the size 30 through 60
actuators, figure 7 shows the size 30i through 60i actuators, figure 8 shows the size 70 actuator, figure 9 shows the
size 70i actuator, and figure 10 shows the size 87 actuator.
Actuator Disassembly
Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. Also shut off all pressure lines to the power actuator, release all pressure
from the actuator. Use lock‐out procedures to be sure that the above measures stay in effect while you work on the
equipment.
1. If equipped, remove the tubing or piping from the connection in the top of the yoke (key 73).
2. Turn the spring adjuster (key 74) counterclockwise (toward the valve body) until all spring compression is relieved.
WARNING
To avoid personal injury due to the sudden uncontrolled movement of parts, do not loosen the stem connector cap screws
when the stem connector has spring force applied to it.
3. If necessary, remove the actuator from the valve body by separating the stem connector (key 31). Loosen the stem
locknuts for the size 87 actuator, and remove the stem connector nuts. For all other sizes, separate the stem
connector by loosening the stem locknuts (keys 69 and 75) and unscrewing the two stem connector cap screws.
4. Unscrew the spring adjuster (key 74) from the actuator stem (key 144). Also lift the spring seat and spring (key 19
and 18) out of the yoke.
5. Remove the diaphragm casing cap screws and nuts (keys 13 and 14), and lift off the upper diaphragm casing (key
1).
CAUTION
Be careful during disassembly to avoid damaging the O‐rings (key 8).
667 Actuator (Size 30/30i - 76/76i and 87)
May 2018
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