Emerson Process Management 3024C - Manual (Page 12)

3024C Actuator
Instruction Manual
Form 5760
March 2007
12
the eight hex cap screws (key 113) that hold the
assembly to the yoke.
2. Loosen the lock (key 115) that secures the drive
screw assembly (key 103).
3. Remove the retaining ring (key 110) and screw
out the drive screw assembly (key 103).
4. Remove the retaining ring (key 108) and drive out
the pivot pin (key 104).
5. Remove the bushings (key 107) from the body
(key 100).
6. There is a cap screw (key 111), hex nut (key 112)
and spacer (key 105) that hold the two levers (key
101) together. Remove the cap-screw and hex nut
and the two levers can be separated in order to
remove the operating nut (key 102).
Assembly
1. Assemble the operator nut (key 102), the two
levers (key 101) and the spacer (key 105) using the
cap-screw (key 111) and hex nut (key 112).
2. Install the bushings (key 107) in the body
(key 100).
3. Attach the levers (key 101) to the body (key 100)
using the pivot pin (key 104) and the retaining ring
(key 108).
4. Apply lithium grease (key 200) to the drive screw
assembly (key 103) and screw it on to the operating
nut (key 102).
5. Install the retaining ring (key 110) to secure the
collar to the body (key 100).
6. If the handwheel assembly was removed from the
actuator yoke, position the assembly within the yoke
so that the eight mounting holes on the assembly
align with those on the yoke and fit the cap-screws
(key 113) tightening to 28 N
Sm (20 lbfSft). Should
difficulty be experienced fitting the levers (key 101)
over (for ATC) or under (for ATO) the actuator/valve
stem connector, then partially stroke the
actuator/valve by applying air pressure to the
actuator diaphragm.
Adjustable Travel Stops
The adjustable up travel stop (figures 11 and 12)
limits the actuator stroke in the upward direction
(limits retraction of the actuator stem).
WARNING
When performing the following
adjustment procedures, take care to
avoid injury when positioning
components.
For Sizes 30, 30E, 34, 34E, 40, and 40E
1. Relieve the air pressure on the diaphragm.
Loosen the hex nut (key 25) and turn the adjuster
(key 24) clockwise into the diaphragm case to move
the actuator stem downward or counter-clockwise to
allow the actuator stem to move upward. Since the
valve has push-down-to-close action, full opening
can be restricted. Check the actuator travel and then
tighten the hex nut (key 25).
CAUTION
The travel stop hex nut (key 25) has an
elastic stop on its underside to
provide an air seal around the travel
stop thread. It is therefore important,
before slackening this nut, to release
any air pressure on the diaphragm.
For Sizes 45 and 45E
The adjustable up travel stop for the sizes 45
and 45E is shown in figure 12. For sizes 45 and 45E,
the adjustable up travel stop cannot be used with a
side mounted handwheel.
1. Remove the screws (key 41) and nuts (key 42)
which hold the protective covers (key 40) to the
actuator yoke and remove the covers.
2. Loosen the machined cheese head screw
(key 37) and turn the adjustment nut (key 38)
clockwise into the bushing (key 36) to increase travel
or counter-clockwise to shorten the actuator travel.
3. Check the actuator travel and then tighten the
machined cheese head screw (key 37).
4. Assemble the protective cover plates (key 40) to
the actuator yoke with the screws (key 41) and nuts
(key 42) taking care to ensure that there is no gap
between the cover plate and the diaphragm casing.