Emerson Process Management 667 - Manual (Page 5)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
5
opening. If the valve is installed in a pipeline, the bottom flange (if one is used) can be removed and the valve plug
pushed to the seat from the bottom opening. Reduce actuator loading pressure to extend the stem approximately
3.2 mm (1/8‐inch).
CAUTION
Incomplete engagement of either the valve stem or actuator stem in the stem connector can result in stripped threads or
improper operation. Be sure that the length of each stem clamped in the stem connector is equal to or greater than the
diameter of that stem.
6. Clamp the actuator and valve plug stems between the two stem connector halves (key 31, figures 6 and 7). Insert
and tighten the stem connector cap screws.
7. Thread the stem locknuts against the stem connector.
8. Align the travel indicator scale (key 32, figures 6 and 7) to show valve position.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws when the stem
connector has spring or loading pressure force applied to it.
Loading Connection
Key number locations are shown in figures 6 and 7, unless otherwise directed.
1. Connect the loading pressure piping to the connection in the size 80 spring case adaptor (key 89) or in the size 100
lower diaphragm casing (key 67).
For top‐loaded actuators
1. For size 80, remove the the pipe bushing (key 78), and connect the loading pressure piping in its place. For size 100,
remove the hex bushing (key 62) from the upper casing (key 1), and connect the top loading pressure piping in its
place.
2. Remove the 1/4‐inch bushing (key 92, figure 6; key 62, figure 7) to increase connection size, if necessary. The
connection can be made with either piping or tubing.
3. Keep the length of tubing or piping as short as possible to avoid transmission lag in the control signal. If an
accessory (such as a volume booster or valve positioner) is used, be sure that the accessory is properly connected to
the actuator. Refer to the positioner instruction manual as necessary.
4. Cycle the actuator several times to check that the valve stem travel is correct and that the travel occurs when the
correct pressure range is applied to the diaphragm.
5. If valve stem travel is incorrect, refer to the Travel procedure in the Adjustments section.
6. If the spring pressure range is incorrect, refer to the Spring procedure in the Adjustments section.
Adjustments
Travel
Make travel adjustments when the motion observed during actuator travel is different from the travel stamped on the
actuator nameplate. If the Actuator Mounting procedure was followed correctly, this adjustment should not be
necessary.