Metso M07 Installation Maintenance And Operating Instructions Download Page 10

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4.9

Assembly

4.9.1 Sizes DN 25-40, 65

Place the valve in a standing position on the pipe flange
end so that the insert thread points upwards. Use a level
surface that will not scratch the flanges.
Screw the insert (2) into the body by itself. Tighten the
insert slightly to ensure that it has gone all the way in. Mark
the position, for example by tapping a screwdriver lightly
against the body at the point of the mark in the insert.
Unscrew the insert and remove it from the body.

H seat:

Place the back seal (63) into the seat (7), see Fig. 20,

and then both parts all the way into the body counterbore.

H seat:

Lock the seat into the body using a special tool

that can be ordered from the manufacturer. The tool is
accompanied by operating instructions.

T / M seat:

Place the seat (7) into the body counterbore.

Place the ball on the locked seat so that the groove faces
the stem entrance opening. Push the stem into the valve
from the outside. Make sure that the end of the stem (5)
fits into the ball groove.

H seat:

Assemble the seat (25), spring (62), back seals (75)

and back-up ring (76), Fig. 20, and place the assembly on
the insert (2).

T / M seat:

Place the seat (7) on the ball (3), see Fig. 21.

Slip the thrust bearings (70, 71), part (70) first, onto the
stem and push them against the stem shoulder.
Put the stem retainer seal (66) in its groove, replace the
stem retainer (8) and tighten the studs (13).
Tighten the nuts (17) of the studs (13) evenly to achieve
uniform compression of the seal (66). The torque is 25
Nm when the threads have been lubricated.
Place the body gasket (65) into the body, on the shoulder
at the foot of the threads.
Screw the insert and seat assembly into the body. This is
easier to do if the valve is horizontal. Tighten the insert
using a spanner wrench until the cap reaches 5-10 mm
past the mark made earlier. The torque is 160 Nm for
DN 25 and 200 Nm for DN 40.

Push the packing rings (69) into their place in the stem
retainer (8).
Tighten the studs (14). Place the gland follower (9) on the
packing rings (69). Lightly screw the nuts (18) onto the
studs (14).
Cycle the valve slowly a couple of times to ensure that
the ball’s position between the seats is correct.
Tighten the gland follower nuts (10 Nm), see also section 4.2.
Check the gland packing for leakage when the valve is
pressurized and re-tighten the nuts carefully if necessary.
Install the valve in the pipeline as carefully and accurately as
when you removed it. Note the instructions given in section 3.

4.9.2 Sizes DN 50-400

Place the valve body on the pipe flange end. Use a level
surface that will not scratch the flanges.

S / K seat:

Place the back seals (63) into the seats (7) as

shown in Fig. 22. Place one of the seats into the body
counterbore.

H seat:

Place the back seal (63), Fig. 22, and the seat (7)

into body counterbore.

K / H seat:

Lock the seat (7) using a special locking tool.

The tool is accompanied by operating instructions.

T / M seat:

Place the seat (7) into body counterbore.

Slip the thrust bearing(s) (70) and secondary stem seal (71)
onto the stem (5). See exploded view for proper orientation.
Push the stem into body (1) from the inside and assemble the
gland packing (69) from the outside. Place the gland follower (9)
over the stem (5). Tighten the gland nuts (18) with fingers.

Slip the spline driver (4) onto the stem. Note the correct
orientation. Place the ball into the body (1) carefully.

K seat:

Place another seat (with the back seal) into the

body cap (2) as described above. Lock the seat

S seat:

Place the seat on the top of the ball.

H seat:

Place the back seal (75), back-up ring (76), spring (62),

Fig. 21, and the seat (7) into body cap.

T / M seat:

Place the seat (7) onthe ball.

Install the body gasket (65) in the body groove.
Place the body cap (2) carefully over body studs (12) and
body (1). See that flange holes are aligned acc. to the mark
made during the dismantling.
Fasten the body nuts (16). Tighten the nuts gradually,
always switching to other side of the valve after every nut.
The recommended torques are given in Table 2.

Fig. 20.

Mounting the back seal, H seat

grooves towards
the ball

1, 2

Fig. 21.

Mounting the T / M seat

H seat

S / K seat

Fig. 22.

Mounting the back seal, S / K and H seats