Flowserve Valtek MaxFlo 3 User Manual

Page 6

User Instructions - MaxFlo 3 - VLEEIM7001-03 07.07

BODY REASSEMBLY

NOTE: Lubricate all threads, bearings and the shaft

shoulder with a boron nitride paste (e.g. Molydal

NB1200) . Place the valve body in a vice and clamp

securely in a vertical position.

Always use new packing and gaskets when reassem-

bling a valve.

Make sure that the shaft, bonnet bore and gasket sur-

faces in the body have been thoroughly cleaned (these

are sealing surfaces and it is important to remove any

contamination before reassembly).

6.3

Make sure that all bearing surfaces have been

cleaned.

6.4

Install all end post (item 5) and bonnet (item 08)

studs.

6.5

Insert the plug in the body as shown in figure b.

NOTE: The end post bearing (item 84) is pressed into

the plug.

6.6

Place the end post gasket (item 6) on the end post

(item ). Insert the end post into the small flanged

port in the end of the body. As the end post is inserted,

locate the plug (item 50) so the end post will insert

into the end post bearing located in the plug.

NOTE: For valves 3’’ and larger, insert the end post

with the milled faces parallel to the flanges of the valve

body.

6.7

Tighten the end post nuts to finger tight.

6.8

Insert the shaft bearing (item 83) into the body until the

shoulder on the bearing contacts the step in the valve

body. The bearing will protrude slightly into the body gal-

lery area.

6.9

Place the thrust bearing onto the shaft. Slide it up

to the thrust runner. The shaft thrust bearing will

surround the thrust runner.

NOTE: for sizes 10” and 12”, an end spacer (item 47)

is placed above the thrust bearing.

6.0 Place the bonnet gasket (item 58) on the gasket step

inside the body. Gently push the bonnet into the bon-

net bore.

NOTE: When installing the bonnet, orient the milled

faces on the bonnet perpendicular to the flanges of the

valve body.

Figure 2a: Plug Removal

Figure 2b: Plug Installation

Table II: Nut tightening torques for bonnet and pivot post

Size

A193-B8 cl2

A453-Gr660

(Nace)

0 Nm

4 Nm

37 Nm

4 Nm

53 Nm

59 Nm

STOP!

VALVE DISASSEMBLY

WARNING: To carry out this operation, it is essential to

disconnect the valve from the pipework. Depressurize

line to atmospheric pressure and drain all fluids before

working on the valve. Failure to do so can cause seri-

ous injury. Remove the valve from the pipeline.

Refer to figure to find parts according to the item

numbers.

Remove the actuator from the body by separating the ac-

tuator at the yoke. Refer to the installation, operation and

maintenance manual for the corresponding actuator.

Remove the four bonnet nuts (item 4).

5.3

Remove the packing nuts and gland flange (item 80)

5.4

Carefully pull the shaft (item 5) out of the body. The

bonnet, thrust bearing, packing stop and packing will

all slide out of the body bore as an assembly.

5.5

Remove the end post nuts (item 9) and carefully re-

move the end post (item ) from the body.

NOTE: At this point in the disassembly operation, the

plug is inside the valve body and is only supported by the

end post. When removing the end post, support the plug

so it does not drop into the bottom of the valve body.

5.6

Remove the plug from the body. See figure a.

5.7

Loosen the packing-box nuts (item 7) and remove the

shaft from the bonnet by sliding it out slowly. The thrust

bearing (item 46) and the shaft stop spacer (item 47, only

for sizes 0 to ”) can now be removed from the shaft.

5.8

Remove the packing follower (item 87) as well as the

packing (item 88), spacers (item 93) and the packing

stop (item 99).

5.9

Remove the bonnet gasket (item 58) and end post

gasket (item 6). Clean all bearing and seal surfaces.

5.0 Remove the shaft bearing (item 83) from the valve

body. Use a suitable dowel to push the bearing out if

necessary. Be careful not to damage the bearing.

5. Unscrew the seat (item 30) using the appropriate tool

(see Table IV) and remove the seat (item 0) as well as

the adjustment shims (item 3).