Flowserve Valtek Valdisk User Instructions page 16

5. Position the disk in the body, making sure it will rotate in
the proper direction with respect to the body's internal disk
stop. Position the thrust bearings on either side of the disk
and slide the shaft through the body, shaft bearings and
disk. The shaft will be in the correct axial position when the
shaft end is 0.03 inch (0.8 mm) short of being flush with the
end of the post side shaft bearing. Ensure that the post
shaft bearing is flush with the thrust bearing.
For two shaft designs slide the actuator shaft and the post shaft
through the bearings and into the disk until it stops.
Exercise care while sliding the shaft
into the sliding stem shaft bearings to
avoid damage to both the shaft and shaft bearings.
6. Turn the shaft flats to allow the taper pins to slide through
the disk pin holes and engage the shaft as shown in the
Figure 9. Insert new taper pins in the direction that is
towards the limit stop in the body. Drive them firmly into
place with a hammer. Peen the disk surface a minimum of
5 locations within 0.06 inch of the taper pin outer diameter.
If welding, tack weld between the taper pin and the disk in
two opposite locations.
Figure 9: Disk and Pin Engagement
7. Slide the packing spacer, lower packing (if applicable),
packing spacer, upper packing, and the follower spacer
over actuator end of the shaft and into the body.
Be careful not to damage the packing on the
anti-blowout groove.
VAIOM000286-02 (EN/AQ) May 2023
Valtek Valdisk High-Performance Butterfly Control Valves
Typical packing configurations are shown in Figure 3. In the
uncompressed state, the packing spacer above the packing
should be within 0.12 inch of the opening of the packing bore.
This will allow sufficient packing compression without the
packing follower interfering with the anti-blowout ring(s).
Since the sealing on V-ring packing
takes place at the feather edge as
shown in Figure 10. It is important to avoid damage to that
edge.
Figure 10: Packing V-ring Configuration
8. Install the snap ring or the half rings into the anti-blowout
groove in the shaft and install the packing follower over the
top.
9. Reinstall the gland flange and packing nuts. Tighten
packing firmly and evenly. Ensure that the stroke
indicator symbols on the surface of the gland flange align
properly with the mark in the shaft.
Do not overtighten packing. This can
cause excessive packing wear and high
shaft friction, which may impede shaft rotation.
10. Reinstall the end flange gasket and the end flange and
evenly tighten the nuts in an alternating pattern. See Table
4 for recommended torque values.
11. All metal seat configurations with screw/clip retainers
require a gasket (item #55) installed in the appropriate
groove. This is accomplished by inserting the gasket into
the appropriate body groove.
12. If the seat retainer is the screw/clip type and has a soft or
dual seat, press the soft seat into the soft seat retainer or
metal seat. There should be an interference between the
soft seat and the retainer. With the disk in the closed
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