9
‘h_
iii
b&REPAIR
AND ADJUSTMENT PROCEDURES FOR HONEYWELL MP-953B, MP-953D,
OR MP-953F PNEUMATIC OPERATORS USED ON ARMSTRONG HUMIDIFIERS
3.
Using a socket wrench, remove the old valve seat (14
from the humidifier cap. Install a new valve seat in
its place.
4.
Remove
the yoke assembly
(36),
from the stem (16).
5.
Remove the old valve and stem assembly (16) from the
bonnet,
and replace with a new valve and stem assembly.
NOTE:
If the stem seals are worn, replace them by
performing Section III (REPLACING STEM SEALS), steps 4
through 8.
6.
Install the bonnet assembly (15) in the humidifier cap,
and tighten securely.
7.
Install the pneumatic operator in accordance with
Section II.
VII. CHANGING THE DIAPHRAGM
To replace the diaphragm, perform the following steps.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Turn off the steam to the humidifier.
Turn off the instrument air to the operator.
NOTE:
Generally,
the diaphragm is replaced without
removing the operator from the
humidirier.
However,
there are times that the location of the humidifier
'-
makes it more convenient to remove the operator to a
workbench for repair.
Remove the six cover screws (31) from the operator
cover (33).
Lift the cover (33) from the frame (29).
Remove the hex nut (34) and washer (32) from the
support (24).
[Do
not disturb the yoke assembly
(36).]
Remove the follower (38) and diaphragm (21) from the
frame (29).
Discard the old diaphragm (21) and lay a new one in its
place.
Place the follower (38) on the diaphragm. Then place
washer (32) around the top of the support
(24),
and
turn on the nut (34). Tighten securely.
With the outer edge of the diaphragm (21) in the groove
of the frame
(29),
place the cover (33) over the frame.
Align the screw holes.
Install and tighten the six cover screws (31).
Turn on the steam to the humidifier.
Turn on the instrument air to the operator.
NOTE:
THE FOLLOWING ADJUSTMENTS ARE NECESSARY ONLY FOR
THE GRADUTROL RELAY USED WITH THE MP-953B OPERATORS‘AND
WITH MP-953F PILOT POSITIONERS.
5
To Next Page
Loading...
Need help?
General
