GE mn-36005_series Service Manual download pdf (Page 16)

12 | GE Oil & Gas

body and retainer taking care not to score sealing

areas.

3�3�5�2 BaIl Plug Reassembly

Note: If installing a new ball plug into a valve equipped

with either the standard metal or Heavy Duty metal

seal rings, the ball plug must be first coated with dry

graphite lubricant as described in steps A and B. If

equipped with an MN-7 seal ring, proceed to step C.

A. Clean the contact surfaces of the ball plug (2) with

alcohol or other suitable degreaser to facilitate

application of the dry graphite spray lubricant. If

necessary, very mild abrasive pads such as Scotch-

Brite™ may be used to remove any oxide layers on the

ball plug (2).

B. Apply the dry graphite lubricant spray (Dow- Corning

321

) in several light coats on the plated seal contact

surfaces of the ball plug (2). Allow the graphite spray to

dry fully – which will produce a dull gray finish on the

coated parts.

C. Replace lower bushing (16) in the ball and position ball

in the body. Replace gasket (15).

D. Lubricate pin shaft (11) and insert through body and

into the ball. Secure with end flange (14) and end flange

nuts (13). Tighten nuts alternately to assure tight seal

against the gasket. (Recommended lubricant SAF-T-EZE

Anti-Seize or equal.)

E. Replace ring (29), and upper bushing (17)on the shaft (5).

Install shaft in the body andengage the ball such that

when the ball is in the closed position, the machined

slot in the shaft end is vertical (perpendicular to the

body axis). Coat shaft below ring groove and bushing

with lubricant (SAF-T-EZE Anti-Seize or equal).

F. Install packing adaptor (28), bevel side out over the

shaft (5) and into the valve bonnet so that the hole

through the side of the adaptor is aligned with the

tapped hole through the bonnet for the safety pin (27).

G. Apply pipe sealant to the safety pin, install into bonnet

and tighten.

Safety pin must engage hole in packing

adaptor� Test by manually pulling on shaft to

verify pin engagement�

H. Install packing (19) so that skive cut of each piece

of packing is offset approximately 120° from that of

adjacent piece.

I. Install packing follower (22) over shaft and into bonnet

with bevel side out. Install packing box flange (23) and

nuts (24).

J. Install seal ring and retainer assembly as described in

section 3.3.2, 3.3.3 or 3.3.4 depending on seal type.

K. Install mounting bracket (31) and lever (32). Follow

instruction 3.1.2 Bracket Reassembly. L. Evenly tighten

packing flange nuts (24) against packing flange (23)

before placing valve into service.

DO NOT over tighten packing flange nuts� After

valve has been in service, retighten packing

flange nuts evenly until any leaks are stopped�

3�4 Actuator Subassembly�

3�4�1 Model 33, sizes B & C� Refer to section 3�7 for size

AC actuators�

3�4�1�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 side covers (46).

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

and spacers (69) (handwheel only) 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 (20) so

that they can be reassembled with the same orientation

of air inlet and mounting bolts.

G. Loosen each tension nut (96) approximately three full

turns.

CAUTION

WARNING

DANGER

CAUTION

WARNING

DANGER

CAUTION

WARNING

DANGER

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GE mn-36005_series Service Manual Page 16

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