Metso XB/XC Series, Installation Maintenance And Operating Instructions

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the packing (69). Remove the pin (50). Remove the
spline driver (2"-8") or thrust ring (1"-1 1/2") inside
the body. For detailed figures to remove the thrust
ring see Fig. 22. Remove the shaft (5) by pulling it
outwards. Please note that this will detach the thrust
bearings (70) from around the shaft.

Remove the ball seat (7) from the body (1), if neces-
sary with a special tool. Also remove the back seals
(63) from the ball seats and the body gasket (65).
4.6.2 Sizes 3"- 6" (XB/XC)

Place the valve in a standing position on the pipe
flange end so that the insert points upwards. Use a
level surface that does not scratch the flange sur-
faces.

Unscrew the insert (2) using a special tool. See Sec-
tion 8 ’Tools’.

Remove the gaskets (65, 135), seat (7) and ball (3). The
ball should be in the closed position for removal.

Remove the key (10).

Unfasten the the gland nuts (18). Remove the disc
spring sets (150), one stud (14), retainer plates (42),
the gland (9) and the packing rings (69).

Remove the pin (50) and then the spline driver.

Remove the stem (5) by pulling it outwards. The
thrust bearings (70) will be detached around the
stem.

Remove the locked seat (7) using an outpulling tool,
see Fig. 23. See also Section 8 ’Tools’.
4.7 Checking the parts of a dismantled
valve

Clean the removed parts.

Check the shaft (5) and the thrust bearings (70).

Check the ball (3) and the ball seats (7, 25).

Check the body gasket surfaces.

Replace any damaged parts.
4.8 Replacing parts
Replace soft parts whenever you dismantle the valve for
maintenance. Replace other parts when necessary. By using
original spare parts, you can ensure proper functioning of
the valve. For ordering the spare parts, see Section 9
(’Ordering spare parts’).
4.9 Reassembling the valve
4.9.1 Sizes 1" - 8" (XT/XA), 8" (XB/XC)

Place the valve body on its pipe flange. Use a surface
that does not damage the pipe flanges.
S seats:

Place the back seal (63) in the ball seat (7); see Fig. 24.
Place the seat in the body (1).
Soft seats (X, T):

Place the seat in the body (1).
Fig. 22 Detaching the thrust ring in sizes 1" and 1 1/2"
Fig. 23 Removing a locked seat
CAUTION:
For safety reasons the retaining plates (42) MUST
always be installed as shown in Section 4.2.
Fig. 24 S seats
Fig. 25 X and T seats
63 63
7
7
63 63
TA
GA
Insert / body cap Body
Body Insert / Body cap
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