Flowserve Valtek FlowTop General Service Control Valve - Manual (Page 10)

60-10 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Reversing Actuator Action
1. Remove actuator from valve body (see Actuator
Removal Procedures steps 1-6 and Replacing Plug
Procedure, steps 1-5).
2. Remove the short diaphragm case bolts (335) and
nuts (351) around the diaphragm chamber.
Remove the thread covers (337) from the long spring
compression bolts (336). Lubricate the threads of the
spring compression bolts (336) with a light oil or
grease. Gradually loosen each of the long spring
compression nuts (335), alternatively by one or two
turns to progressively relieve the compression of the
actuator springs inside the chamber.
WARNING: Long spring compression bolts
(336) must always be removed last to ensure
the spring compression is fully released before
the diaphragm upper casing (203) is removed.
NOTE: Sometimes it is easier to use a press to
hold the diaphragm casing in place while the
spring compression bolts (335) are removed,
the springs can be relieved by using the press,
in place of the bolts (335).
3. Remove the upper diaphragm case (203).
4. Remove the actuator stem nut (248). Flats are
provided on the lower end of the actuator stem (211)
to prevent rotation. The diaphragm washer (360),
diaphragm (225), spring plate (227), bushing (253)
and springs (229) may now be removed.
5. Assemble the internal parts in accordance with
Figure 9 air-to-close / fail-open (direct-acting) or
Figure 10 air-to-open / fail-closed (reverse-acting).
Follow above disassembly procedure 1 to 4 in
reverse sequence. To simplify assembly, position
the actuator in a vertical position.
NOTE: When reassembling the actuator, apply
lubricant to O-rings seals (Like Dow 55)
ACTUATOR SERVICE
Replacing actuator diaphragm
1. Remove the stem clamp and disconnect the air
supply (see Replacing Plug Procedure, steps 1-5).
2. Disassemble the actuator in accordance with steps
1-4 in the Reversing Single Actuator Action procedure.
3. Use a new actuator diaphragm (225) and assemble
the internal parts in accordance with Figure 9
air-to-close / fail-open (direct-acting) or Figure 10
air-to-open / fail-closed (reverse-acting) for 2109.
Replacing the stem seal assembly
1. Remove the actuator by following steps 1-6 of
Actuator Removal.
2. Disassemble the actuator by following steps 1-4 of
Reversing Single Actuator Action.
3. Remove the actuator stem (211) through the lower
diaphragm case (202).
4. The stem seal assembly (257) is pressed into the
lower diaphragm case (202). Remove the stem seal
assembly (257) by wedging the blade of a screwdriver
between the lower portion of the metal seal housing
and the lower diaphragm case (202). Or give the
assembly a firm bump. It is a snug fit, but should be
easily removed.
5. To install the seal assembly, lubricate all the seals
with a good lubricant (like Dow 55). Firmly press
the assembly into the lower diaphragm housing.
WARNING: If lubricant is not used on the seal,
seal life will be reduced.
6. Install the seal by pressing it into the bore of the
diaphragm case (202). Tapping it slightly with a soft
rubber mallet may ease installation.
7. Install the actuator stem (211) through the bottom
of the diaphragm case (202).
8. Reassemble the internal parts according to the air
action and size.
ACTUATOR MOUNTING
1. Push the plug into the seat.
2. Mount the actautor to the yoke by inserting the
threaded seal assembly through theyoke. Install
the actuator nut and tighten it. Next mount the yoke
to the bonnet and position the yoke nut.
3. Connect the air supply to the actuator.
4. Set a direct-acting (air-to-close / fail-open) actuator
to mid-stroke by adjusting the air supply pressure.
5. For reverse-acting (air-to-open / fail-closed)
actuators, apply the minimum air supply pressure
to the actuator (listed on the name plate) to position
the actuator stem to its minimum setting.
6. Connect the plug stem (50) and the actuator stem
(211) at the set position using the stem clamp (249)
with the plug in the fully CLOSED position. While
connecting the stem clamp with the stem clamp
bolts, install the stroke indicator (248).
7. Tighten the post yoke nut (349).
8. If necessary, adjust stroke plate (213) while the
valve is fully CLOSED.
IM049 FlowTop IOM.p65 2/10/03, 12:34 PM 10