Emerson Fisher 585C Series Instruction Manual page 12

585C Actuator
October 2013
1. If not already removed, remove the stem connector (key 12) by loosening the cap screws (key 14).
2. Thread the stem connector nuts (keys 13 and 15) onto the valve stem, and run the nuts to the bottom of the valve
stem threads.
3. Push the valve plug stem until the valve plug is closed for push-down-to-close valve plug action.
4. Place the actuator on the bonnet of the valve and secure the actuator tightly to the bonnet with the yoke locknut.
CAUTION
In the following procedure, do not rotate the valve plug while it is seated since this may cause damage to the seating
surface and thereby allow excessive leakage. Also, during adjustment, use tools carefully to avoid damaging the valve plug
stem. A damaged valve plug stem could cut the packing and allow leakage.
Note
When using an actuator with handwheel in the following step to stroke the valve plug, be sure the bypass valve (key 66, figure 5, 7,
or 8) is open. Rotating the handwheel (key 47, figure 5, 7, or 8) clockwise extends the actuator stem (key 10); rotating the
handwheel counterclockwise retracts the actuator stem.
5. Perform one of the following procedures (a or b as appropriate):
a. For a 585C actuator with spring retraction upon loss of cylinder pressure (figures 4 and 5) on a
push-down-to-close valve, manually move the valve plug to the seated position. Rotate the handwheel or apply
pressure to the pressure connection in the cylinder (key 1) until the piston (key 3) and actuator stem (key 10)
move down the specified travel. Run the stem connector nut (key 13) up on the valve stem until it contacts the
actuator stem. Be sure the flats on the actuator stem are perpendicular to the scale indicator web on the yoke
(key 6). Adjust the stem connector nut as necessary, so that the flats on the nut and the actuator stem are
parallel. Clamp the actuator stem and stem connector nut together with the stem connector (key 12) and the
two cap screws and hex nuts (keys 14 and 23). Run the hex nut (key 15) up the valve stem and tighten against the
stem connector nut (key 13).
b. For a 585C actuator with spring extension upon loss of cylinder pressure (figures 6 and 7) with
push-down-to-close valve, manually move the valve plug to the seated position. Run the stem connector nut
(key 13) up the valve stem until it contacts the actuator stem (key 10). Rotate the handwheel or apply pressure
to the pressure connection in the yoke (key 6) to move the actuator stem (key 10) approximately 1/4 inch away
from the stem connector nut. Rotate the stem connector nut so that it moves up the valve stem two full turns.
Manually move the valve plug so that the stem connector nut again contacts the actuator stem. Be sure the flats
on the actuator stem are perpendicular to the scale indicator web on the yoke (key 6). Adjust the stem connector
nut, as necessary, so that the flats on the nut and the actuator stem are parallel. Clamp the actuator stem and
stem connector nut together with the stem connector (key 12) and the two cap screws and hex nuts (keys 14
and 23). Run the hex nut (key 15) up the valve stem and tighten it against the stem connector nut (key 13).
6. Cycle the actuator several times to check for proper operation.
Note
In the following step, make sure the correct travel indicator scale (key 19) is used per the Parts List for the desired travel.
7. If necessary, remove the travel indicator scale screws (key 18) and reposition the travel indicator scale (key 19) so
that the scale arrow points in the same direction as the valve plug moves when opening. Close the valve. Adjust the
scale up or down so that the stem connector (key 12) indicator lines up with the closed mark on the scale. Secure
the scale with the scale screws.
12
Instruction Manual
D102087X012