Fisher-Rosemount 3024S, Инструкция по эксплуатации

Страница: 8 / 20

8
Design 3024S
Changing Actuator Action
The Actuator can be changed from a Type 3024S ATO to a
3024 ATC or vice versa by removing the pressure plate,
diaphragm, O-ring, diaphragm plate, hex nut, springs,
spring locator, self tapping screws and vent assembly (key
10, 11, 12, 13, 14, 15, 17, 18 and 23) and installing them for
appropriate action. See figures 6, 7, 9 and 10. For hex nut
or travel stop (key 14) and pressure plate (key 10) selection
refer to parts list. Follow the procedures in the Actuator
Mounting section and the Travel Adjustment section for
connection to the valve.
Side-Mounted Handwheel
A side-mounted handwheel assembly (figure 4) is
usually used as a manual operator. When mounted on
an ATC type 3024S actuator, turning the handwheel
clockwise always closes the valve. When mounted on an
ATO actuator, turning the handwheel clockwise always
opens the valve, A lever (key 49, figure 12) on the
handwheel assembly opens or closes the valve by
moving the valve stem.
Instructions are given below for complete disassembly
and assembly. Perform the disassembly only as far as
necessary to accomplish the required maintenance; then
begin the assembly at the appropriate step.
Refer to figure 12 for key numbers.
Disassembly
1. If desired, the handwheel assembly can be removed from
the actuator leg post. To do this, remove the hex nuts (key
62) and back plates (key 64) from the U-bolts (key 61) that
hold the assembly to the leg-post.
2. Loosen the lock (key 63) that secures the drive screw
assembly (key 51).
3. Remove the retaining ring (key 58) and screw out the
drive screw assembly (key 51).
4. Remove the retainer ring (key 56) and drive out the pivot
pin (key 52).
5. Remove the bushings (key 55) from the body (key 48).
6. There is a cap screw (key 59), hex nut (key 60), and
spacer (key 53) that hold the two levers (key 49) together.
Remove the cap-screw and hex nut and the two levers can
be separated in order to remove the operating nut (key 50).
Assembly
1. Assemble the operating nut (key 50), the two levers (key
49), and the spacer (key 53) using the cap screw (key 59)
and hex nut (key 60).
2. Install the bushings (key 55) in the body (key 48).
3. Attach the levers (key 49) to the body (key 48) using the
pivot pin (key 52) and the retaining ring (key 56).
4. Apply lubricant Lubriplate MAG-1 or equivalent to the
drive screw assembly (key 51) and screw it on to the
operating nut (key 50).
5. Install the retaining ring (key 58. to secure the collar to
the body (key 48).
6. If the handwheel assembly was removed from the
actuator leg posts, position the U-bolts (key 61), back plate
(key 64) and handwheel body (key 48) to the actuator leg
posts as shown in figures 3 & 12. Tighten the hex nuts (key
62) to 19 N.m (14 lbf.ft). Clearance between the lower
diaphragm casing and the handwheel body are shown in
figure 4. With the actuator fully open the distance between
the lower face of the actuator stem connector and the
actuator flange should be shown in figure 4.