GE mn-36005_series Service Manual download pdf (Page 17)

Masoneilan 36005 Series High Capacity Control Ball Valves | 13

The upper diaphragm case (84) should

separate from the lower case (91) 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 circumference or inserting a

screwdriver between the upper (84) and lower

case (91)� If the cases still do not separate,

check that the actuator stem is not hung

up inside the bracket� DO NOT PROCEED

WITH DISASSEMBLY UNLESS THE CASES CAN

SEPARATE FREELY�

H. Continue loosening the tension nuts (96) evenly

approximately three turns each time ensuring that

the upper diaphragm case (84) and diaphragm (85)

continue 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. Remove diaphragm (85) and diaphragm plate

subassembly from the actuator.

K. Remove retaining clip (78). Remove clevis pivot pin (79).

Inspect for damage and/or wear in clevis (80), lever (32),

clevis pins (79, 39) and rod end bearings (94). Replace if

necessary.

L. Clean all mating/sealing surfaces which will come in

contact with the diaphragm (85).

3�4�1�2 Reassembly

A. Connect rod end bearing (94) to diaphragm plate

clevis (80) by installing clevis pin (79) and retaining

clips (78). Ensure that the stem (77) is installed such

that the wrench flats are at the end furthest from the

diaphragm plate (88).

B. Ensure spring (90) and spring guide (89) are properly

aligned in lower case (91) and install the diaphragm

plate and stem subassembly. Replace diaphragm (85).

C. Align marks for correct orientation of upper case (84)

and lower case (91). Replace upper diaphragm case (84)

and install long cap screws (95), warning plate (97) and

tension nuts (96).

Note: These bolts must be equally spaced at 120°

intervals.

D. Take up tension nuts (96) evenly and sufficiently to

allow installation of short cap screws (83) and hex nuts

(87).

E. 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 overtighten.

F. Connect rod end bearing (94) to lever (32) by installing

pivot pin (39), spacers (69) (handwheel only), and

retaining clips (40).

G. Replace side covers (46) and reconnect signal and

supply lines.

H. Place back in service and, if so equipped, rotate

handwheel to desired position.

3�4�2 Actuator Subassembly – Model 33, size AC� Refer

to section 3�4�1 for sizes B & C� Figures 13, 14, 15 & 16�

3�4�2�1 Disassembly

The upper diaphragm case (84) is under spring

tension� A warning tag (97) is attached to

each of the three (3) long cap screws (95)� The

tension nuts (96) attached to cap screws (95)

must be evenly removed last� The following

procedure must be followed to avoid injury�

A. Isolate the valve, vent process pressure and shut off all

electrical, signal air and supply air 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 covers (44 & 46).

E. Remove retaining clips (40) and remove pivot pin (39) to

free rod end bearing (94).

F. Loosen and remove all short cap screws (86) and hex

nuts (87). Mark upper case (84) and lower case (91) so

that they can be reassembled with the same orientation

of air inlet and mounting bolts.

G. Loosen each tension nut (95) approximately three full

turns.

CAUTION

WARNING

DANGER

CAUTION

WARNING

DANGER

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GE mn-36005_series Service Manual Page 17

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