AND ADJUSTMENT PROCEDURES FOR HONEYWELL
MP-953B,
MP-953D,
OR MP-953F PNEUMATIC OPERATORS USED ON
ARNSTRONG
HUMIDIFIERS
II.
INSTALLING THE PNEUMATIC OPERATOR
After necessary repairs have been made, perform the
following steps to install the operator.
1.
2.
3.
4.
5.
6.
7.
a.
9.
10.
Press down the valve stem (16) so
that the valve is
completely
closed.
_Stem
Adapter
If the stem nut (17) and stem
,Stem
Nut
adapter (17A) were not removed
3-i/2"*
--.__
---Stem
during
repairs, check
the
adjustment shown
in Figure 2.
Adjust as required.
_Matinq
surface
If the stem nut (17) and stem
for
Operator
adapter (17A) were removed during
-Humidifier
repairs,
turn them onto the stem
and adjust as shown in Figure 2.
*With valve in closed position
Assemble the yoke assembly (36) and
Figure 2.
stem adapter (17A) in the following
manner.
4
Hold the bearing (36B) in the orientation shown in
Figure 1 (flat side down, depression up).
Slide
the bearing into the groove of the stem adapter
(17A).
b)
Place the spring (36C) on top of the stem adapter
(17A)
and bearing
(36B) with the longer tabs
pointed downward toward the notches in the sides
of the bearing.
c)
Slide the yoke (36A) over the spring
(36C),
bearing
(36B),
and stem adapter (17A) until the
short tabs of the spring snap into place on both
sides of the yoke.
Center the yoke over the stem
(16)
l
Place the operator over the yoke assembly (36) and
lower the operator onto the bonnet (15).
Hold the operator to prevent it from turning.
Insert a
screwdriver into the slot in the top of the yoke (36)
and turn counterclockwise until the operator base (26)
contacts the mating surface of the bonnet (15).
Tighten
th.e
two set screws (27).
Load the stem by turning the yoke (36) clockwise until
the spring cup (28) is from
l/16
to
l/8
inch above the
operator base (26).
(Dimension
"A"
in Figure 1).
Install the operator plug (35) in the top of the
MP-
9530 or close the access plate on the top of the
MP-
953B or MP-953F.
Turn on the steam to the humidifier.
Connect the air line to the operator and turn on the
instrument air.
Make any necessary adjustments.
2
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