Masoneilan 37002 Series MiniTork II Valve (w/actuator Model 33) Instruction Manual | 15
Copyright 2020 Baker Hughes Company. All rights reserved.
Disassembly Procedures
This section addresses the complete disassembly of the
MiniTork II valve and actuator in order to gain access to repair
or replacement of components. If only partial disassembly is
required, such as when changing valve action, refer only to the
appropriate section. It is highly recommended that the unit be
removed from the line for disassembly.
Actuator Removal
CAUTION
CAUTION
WARNING
DANGER
When working on air to close units,be certain that the
vane is not jammed in the closed position with the ac-
tuator spring exert ing force to open the valve. In such
a case, while disassembling, the valve could sud-
denly snap open, possibly causing injury. When the
actuator stem is fully extended, the spring is exerting
force in the opposite direction. If the valve is jammed
closed, on an air to close unit, use external air supply
pressure to hold the ac tuator in a closed position and
complete the necessary steps in this section to dis-
connect pivot pin (12) then release air pressure from
the actuator ensuring rod and bearing (94) separates
from lever (33) and actuator stem (77) fully retracts.
A. If equipped with a handwheel it must be rotated to the
disengaged position.
B. Remove positioner and air piping to upper dia phragm
case (84).
C. Remove side covers (56), front cover (13) and bottom
cover (19).
D.
Ensure actuator stem is fully retracted (see Caution
above).
E. Remove retaining rings (11), pivot pin (12) and spacers
(10).
Note: The spacers (10) are only used on units equipped
with handwheel.
F. Remove hex nuts (75) and lockwashers (76) and lift
actuator from bracket.
Actuator Disassembly
A. Loosen and remove all short capscrews (86) and hex
nuts (87).
B. 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 around the circumfer-
ence or Inserting the screwdriver between the upper
and lower case (84) and (91).
C.
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 C until the tension nuts (96) can be
easily removed by hand indicating the upper diaphragm
case (84) is not under spring tension.
D. Remove tension bolts (95) and upper diaphragm case
(84).
E. Remove diaphragm/diaphragm plate sub assembly
from the actuator.
For Actuator Model 33 OLD Version (refer to Figures 15 & 17)
F-1. Holding the trunion block with a suitable wrench, loosen and
remove capscrew (84) and Dyna-seal washer (82).
Note: Hold trunion block so as to not damage tru nion
block plug ( 79) or capscrews (81).
G-1. With capscrews (83) removed, stop (80), diaphragm
(85), diaphragm plate (88) and spring guide (89) may be
separated from trunion block and stem subassembly.
H-1. Loosen capscrew (81) and remove trunion block plug (79).
I-1. Actuator stem (77) may now be removed from trunion block
(78).
J-1. Loosen locknut (93) and unscrew rod end bearing (94).
K-1. Remove spring (90). spring button (98) and stop (92) from
lower diaphragm case (91).
L-1. Refer to Actuator Reassembly section.
For Actuator Model 33 New version (refer to Figure 25)
F-2. Remove retaining rings (81), holding the stem/rod
subassembly (77), remove pin clevis (79).
Note: Stem/rod subassembly (77) may now be removed.
G-2. Disassemble stop (98)and diaphragm (85), loosen and
remove capscrew (83) , diaphragm plate (88) and spring
guide (89), while holding diaphragm clevis plate (78).
H-2. Remove diaphragm clevis plate (78)
I-2. Disassemble Stem/rod subassembly (77).
J-2. Remove spring (90), stop subassembly(92) from lower
diaphragm case (91).
K-2. Refer to Actuator Reassembly section.
Handwheel Removal
A. Rotate handwheel lo disengage position.
B. Remove bottom cover (19).
C. Remove retaining clips (40) and clevis pin (39).
D. Loosen and remove capscrews (43), lockwashers (44) and
remove handwheel and bracket subassembly.
