GE mn-36005_series Service Manual download pdf (Page 14)

10 | GE Oil & Gas

When stroking valve keep hands and

equipment clear of ball plug and seal ring

to avoid injury or damage to personnel or

equipment� Do not exceed pressure specified

on the valve nameplate�

F. Replace shaft cover (42) and screw (43) (or positioner if

so equipped).

G. Replace handwheel assembly (54) in housing (31) and

replace washer (54-4) and retaining clip (54-7).

H. Set and lock indicator arm (35) to indicate plug position.

I. Check that handwheel operates valve through full range

of travel.

3�3 Body Subassembly

3�3�1 Packing

Note: The packing follower should be held firmly, but

not too tightly against the packing.

Overtightening of the packing causes excessive friction

and may affect valve operation. The packing in a new

V-Max valve has not been tightened prior to shipment. It

is recommended that further adjustments be made when

the valve is put into service. If necessary to add packing,

proceed as follows:

Valve must be isolated and process pressure

vented before performing packing box

maintenance�

3�3�1�1 Disassembly

A. Loosen and remove packing flange nuts (24) and

slide packing flange (23) and packing follower (20)

toward shaft lever (32). Note: The lever (32) may be

disconnected from the actuator stem and pushed up

against the shaft bearing (47) (refer to section 3.1), if

necessary for clearance.

B. Using a packing hook, remove the top pieces of packing

rings.

3�3�1�2 Reassembly

A. Install new packing ring(s), making sure the skive cut in

adjacent packing rings is offset 120° apart.

B. Replace packing follower (20) packing box flange (23)

and packing nuts (24).

C. Evenly tighten packing nuts (24).

DO NOT overtighten packing nuts�

D. Place valve into service and tighten packing nuts (24)

only as much as necessary to stop any leakage.

3�3�2 Seal Ring – MN-7 Seal

3�3�2�1 Disassembly

Note: Seal ring removal, inspection and reinstallation

must be done with the valve removed from the

pipeline.

A. Remove screws (9) and washers (10), retainer (3), MN-7

seal ring (8) and downstream back-up ring (32).

B. Remove gasket (4) residue from body and retainer

taking care not to damage seal surfaces.

3�3�2�2 Reassembly

A. Move ball to the closed position.

Note: Use a light coating of Dow-Corning 111

equal on the ball plug to break in seat.

B. Replace backup ring (32), seal assembly, gasket (4) and

retainer (3). Take care that beveled edges of seal (8) and

backup ring (32) are facing the ball.

C. Replace set screws (9) and washers (10) and tighten.

3�3�3 Seal Ring – Standard Metal Seal

3�3�3�1 Disassembly

Note: Seal ring removal, inspection and reinstallation

must be done with the valve removed from the

pipeline.

A. Remove screws (9) and washers (10).

Note: The flexible metal seal assembly consists of a

seal ring (8), gasket (7), and backup ring (6).

B. Mark flexible metal seal ring (8) so that, if reinstalled,

the same side will be in contact with the ball. Remove

retainer, seal assembly and downstream back-up

ring (32). If difficulty is encountered in removing seal

assembly, rotate the ball to open position and pull out

the seal ring.

C. Remove gasket (4) residue from body and retainer

taking care not to damage seal surfaces.

D. If replacing MN-7 or flat metal seal with HD metal

version, upper and lower guide bushings (16, 17) should

be replaced with satellite material.

3�3�3�2 Reassembly

Note: If retrofitting a valve originally equipped with an

MN-7 seal ring follow steps A through D. If valve was

originally supplied with a metal seal, please proceed to

step C.

CAUTION

WARNING

DANGER

CAUTION

WARNING

DANGER

CAUTION

WARNING

DANGER

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

Comments to this Manuals

No comments

GE mn-36005_series Service Manual Page 14

Comments to this Manuals

Related products and manuals for Motor vehicle accessories & components GE mn-36005_series