14 | Baker Hughes
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W. Place back in service and if so equipped, rotate
handwheel to desired position.
Type 33 NEW Version Actuator (produced after year 1993) -
refer to Figure 25
A. Isolate the valve, vent process pressure and shut off
all electrical signal air and supply lines to the valve.
B. If equipped with a handwheel, it must be rotated to
the disengaged position.
C. Remove air supply piping to upper diaphragm case
(84).
D. Remove retaining rings (11) and remove pivot pin (12)
and spacers (10) (handwheel only) to free rod end
bearing (94).
E. Loosen and remove all short cap screws (86) and hex
nuts (87).
F. Loosen each tension nut (96) approximately three full
turns.
CAUTION
CAUTION
WARNING
DANGER
The upper diaphragm case (84) should separate as
the tension nuts are loosened the three turns. If it
does not, before proceeding, separate the upper
diaphragm case (84) by tapping it around the circum-
ference or inserting a screwdriver between the upper
and lower case (84-91).
G. Continue loosening the tension nuts (96) evenly
approximately three turns each time insuring that the
upper diaphragm case (84) and diaphragm (85)
continue to separate.
Note: Continue Step G until the tension nuts (96) can be
easily removed by hand indicating the upper diaphragm
case (84) is not under spring tension.
H. Remove tension bolts (95) and upper diaphragm case
(84).
I. Remove diaphragm from the actuator.
J.
Clean all mating/sealing surfaces which will come in
contact with the diaphragm (85).
K. Determine correct orientation for air inlet and replace
upper diaphragm case (84) and install long capscrews
(95), warning plate (97) and tension nuts (96).
Note: These bolts are installed spaced as shown in
Figure 14.
L. Take up tension nuts (96) evenly and sufficiently to
allow installation of short capscrews (83), and hex
nuts (87.)
M. Tighten tension nuts (96) and then tighten all hex nuts
(87) using a criss-cross tightening pattern.
Note: Nuts should be tightened only enough to seal the
diaphragm between the upper and lower case. Do not
over tighten.
N. Place back in service and if so equipped, rotate
handwheel to desired position.
