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Check that ends of bias and feedback springs are
properly located. Install new Relay/positioner
bracket assembly on Actuator cover.
Replace short tube from Relay/positioner branch port
to fitting on side of Actuator cover.
Reinstall remaining air lines and return system to
service.
Adjust range (MP953B only) and/or start point. See
MAINTENANCE.
REPLACE GRADUTROL RELAY/
POSITIVE POSITIONER
FEEDBACK SPRING
See
appropriate part of REPLACE GRADUTROL
RELAY/POSITIVE POSITIONER for correct feedback
spring replacement procedures.
REPLACE GRADUTROL RELAY/
POSITIVE POSITIONER FILTER
When using the following procedure, see Figures 5, 8,
and 9 for exploded diagrams and Tables 6 and 7 for parts.
Remove tubing.
Remove Gradutrol Relay air fittings.
2.
Remove filters from Relay ports with pointed tool
3.
such as an awl.
Install foam filters, taking care not to fold filters or
4.
bunch them together.
Reinstall fittings and tubing. Restore system to
5.
service.
When using the following procedure, see Figures 8 and 9
for exploded diagrams and Tables 6 and 7 for parts.
Remove tubing.
To remove positioner from Actuator cover, follow
appropriate procedures under REPLACE
GRADUTROL RELAY/POSITIVE POSITIONER.
Remove service plate (Fig. 12 through 14) from
positioner.
Replace filter assembly with Filter Assembly
14001865-001.
5.
Replace service plate and reinstall positioner.
6. Reconnect tubing and restore system to service.
INSTALL STEM ANTISPIN
FEATURE
GENERAL
A valve
stem
will not spin when it is locked to the
Actuator. The antispin feature is built into 13-inch
modifying the latching mechanism in the Actuator then
replacing the stem button on top of the valve.
10 for exploded diagrams and Tables 6 and 8 for parts.
MODIFY ACTUATOR
Disconnect air lines.
1.
Loosen two Actuator base/valvebonnet setscrews and
2.
release stem button latch located on underside of
Actuator cup.
Remove Actuator from valve.
3.
4.
On Relay/positioner equipped Actuators (MP953A
and E), refer to appropriate procedures under
REPLACE GRADUTROL RELAY/POSITIVE
POSITIONER. Remove feedback spring.
Remove Actuator cover, diaphragm, cup, spring,
5.
retainer, and plate. Refer to appropriate procedures
under REPLACE MAIN DIAPHRAGM for
disassembly.
Replace plate with Antispin Plate 3 11975A.
6.
7.
Reassemble retainer, spring, cup, diaphragm, cover,
and positioner.
REPLACE VALVE STEM BUTTON
Use the following procedure to replace the stem button on
Valves. The procedure requires Stem Button 3 12495.
Remove existing stem button.
Replace old button with new button, checking that the
new button is installed at the same height as the old
button.
Reinstall Actuator on valve.
Reconnect air lines and restore system to service,
12
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