Raimondi Ball Valves - type HPA - 150# to 1500#
Installation & Maintenance Instructions
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page 4
5.3.3.2. Check carefully:
• The sealing contact area of the seats (11A) (scores, creepling, sinking). The sealing
contacts may not be scored or damaged and must be recessed with respect to the
metallic support (see drawing Appendix B).
• The surface of the ball. The part in contact with the seat may not be damaged and may
not show any scores or impact marks.
• O-ring at back section of seat (109).
It must not be porous or broken and the contact surface must not show any scores of
corrosion marks.
After these check, three cases may occur:
Case Nr. 1
The ball and the seats are not damaged, the O-ring item 109 is defective.
Case Nr. 2
The ball is not damaged, the seats are defective.
Note: the O-ring must be systematically replaced with the seats, we recommend also to
change the seats spring washers (10).
Case Nr. 3
The ball is damaged and the seats are consequently also damaged.
5.3.3.3. Repairing
Case Nr. 1
• Replace the seal (109 and/or 53) of the seat (11) and lubricate it slightly with “Elf
Proteran DN35X” lubricant or equivalent.
• If necessary, sandpaper the surface of the flange in contact with the seal (109) and
clear it carefully.
• Install the seat in the flange after having installed the spring washer (10). This operation
must be performed very carefully in order not to damage the O-rings (109).
• Body/flanges seal (see paragraph 5.3.1)
• Reinstall the flanges (2) after having cleaned the seals in the body. Before reinstalling,
slightly lubricate the O-ring (106).
• Reinstall and tighten the nuts (113) according to the torque load mentioned in Appendix
A tables (see also paragraph 6).
Case Nr. 2
• Apply the same procedure but with a new seat (11) and new spring washer (10).
Case Nr. 3
• Carry out procedure described in Cases Nr. 1 and Nr. 2 for the removal of flanges and
the replacement of seats.
• Remove the adaptor flanges (9) according to procedure paragraph 5.1.2.3.2.
• Remove the lower stem according to paragraph 5.1.2.3.2.
• Put the ball in open position.
• Attach the upper stem with a flexible sling through the passage or put stem axis in
horizontal position to avoid it to fall down into body access.
• Remove the ball from the body.
• Install a new ball.
• Put the ball in open position.
• Reinstall the flanges (2), the bolts (112) and nuts (113).
• Reinstall the lower stem.
All bolts must be tightened following diametrically opposite positions, as usual with all
bolted devices fitted with seals
Tightening torque values: see tables of Appendix A.
