Masoneilan 37002 Series MiniTork II Valve (w/actuator Model 33) Instruction Manual | 13
Copyright 2020 Baker Hughes Company. All rights reserved.
Actuator Diaphragm Replacement
CAUTION
CAUTION
WARNING
DANGER
This section pertains to actuator Model 33 Old
Version and Model 33 New Version indicated where
applicable.
CAUTION
CAUTION
WARNING
DANGER
The upper diaphragm case (84) is under spring
tension. A warning tag (97) is at tached to each of the
three (3) long capscrews (95). The tension nuts (96)
attached to cap screws (95) must be evenly removed
last. The following procedure must be followed to
avoid Injury.
Type 33 OLD Version Actuator (produced up to year 1993) -
refer to Figures 15 & 17
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 side covers (56).
E. Remove retaining rings (11) and remove pivot pin
(12) and spacers (10) (handwheel only) to free rod end
bearing (94).
F. Loosen and remove all short cap screws (86) and hex
nuts (87).
G. 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 screw driver between the upper
and lower case (84-91).
H.
Continue loosening the tension nuts (96) evenly
approximately three turns each time insuring that
the upper diaphragm case (84) and diaphragm (85)
con tinue to separate.
Note: Continue Step H until the tension nuts (96) can be
easily removed by hand indicating the upper diaphragm
case (84) is not under spring tension.
I. Remove tension bolts (95) and upper diaphragm case
(84)
J. Holding the trunion block with a suitable wrench or
vice, loosen and remove capscrew (83) and Dyna seal
washer (82).
K. Remove diaphragm/diaphragm plate subassembly
from the actuator .
Note: Trunion block should be held so as not to damage
trunion block plug (79) or capscrews (81).
L. With capscrew (83) removed,stop (80), diaphragm
(85),diaphragm plate (88), and spring guide (89)
may now be separated from trunion block and stem
subassembly .
M.
Clean all mating/sealing surfaces which will come in
contact with the Dyna-seal washer (82), diaphragm
(85), stop (80) and diaphragm plate (88).
Note: Diaphragms used in the MiniTork II Series
actuators are the same as those used on HPBV Ball
Valve II and SigmaF Series actuators, therefore they are
supplied without a punched hole for the capscrew (82).
Prior to proceeding with reassembly, a hole must be
punched in the center of the diaphragm. The hole must
be just sufficient for the capscrew (83) to enter which
will allow the Dynaseal washer (82) to seal around the
capscrew (83) when it is tightened.
N. Place new Dyna-seal washer (82) on capscrew
(83) and insert into stop (80) with cupped edge of stop
towards the capscrew head.
Note: On 30 sq. in. and 70 sq. in. actuators the stop (80)
and spring guide (89) are identical and interchangeable.
However, on the 140 sq. in. actuator the stop (80) has a
much smaller diameter than the spring guide making it
easily identifiable.
0. Insert capscrew (83) through diaphragm (85),
diaphragm plate (88). spring guide (89).
Note: The diaphragm plate (88) and spring guide (89)
are assembled with the cupped edge away from the
diaphragm (85).
P. Screw capscrew (83) into trunion block (78) and
tighten firmly.
Note: When holding trunion block (78), care must
be taken not to damage trunion block plug (79) or
capscrews (81).
Q. Ensure spring (90) and spring guide (98) are properly
aligned in lower case (91) and install the diaphragm/
diaphragm plate and trunion block subassembly.
R. 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.
S. Take up tension nuts (96) evenly and sufficiently to
allow installation of short capscrews (83), and hex
nuts (87.)
T. 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.
U. Connect rod end bearing (94) to lever (33) by installing
pivot pin (12), spacers (10) (handwheel only), and
retaining rings (11).
V. Replace side covers (56) and connect air supply piping
to upper diaphragm case (84).
