Samson 3248-1, Mounting And Operating Instructions

Plug:
Caution!

Do not twist the bellows!

1. Use SAMSON socket wrench to unscrew

the bellows nut (6.4). Pull plug stem ex-
tension together with the bellows seal,
guide bushing (6.6), and the plug stem
and plug out of the cryogenic extension
bonnet.

2. Used a suitable tool to clamp the cryo-

genic extension bonnet tightly.

3. Unthread the plug out of the extension.
4. Loosen nut (6.7). Unscrew guide bushing

(6.6). In the case of large nominal sizes,
unscrew second nut and remove guide
bushing.

Note!

There is no guide bushing (6.6) in

valve sizes NPS 4 and 6/Class 150 - 300,
version with split plug stem extension.

5. Apply lubricant (order no. 8150-0116)

to the plug stem thread of the new or
original plug that has been machined.

6. Screw guide bushing (6.6) onto the plug

stem extension as far as it will go. Lock
into position with the nut (6.7) or slide

on the guide bush and fasten with two
nuts.

7. Check that both washers (6.8) are still in

the plug stem extension. Screw the plug
stem tightly into the plug stem extension.
Tightening torque: 50 Nm with DN 25
to 80 and 80 Nm with DN 100 to 150.

Seat:

If the seat must also be replaced, proceed as
follows:

8. Use a SAMSON seat wrench to unscrew

the seat (2) out of the valve body.

9. Apply lubricant (order no. 8150-0116)

to the seat thread of the new seat and
screw in tightly observing the tightening
torques in Table 1.

Assembly:

1. Slide plug stem extension together with

guide bushing and plug into the body.

2. Insert bellows nut (6.4) and screw tight

(observing tightening torques in the table
below). Make sure that no torque is
transmitted to the bellows.

10

EB 8093 EN

Maintenance

Table 1

Tightening torque Nm

or steel and aluminum version

Nominal size

Seat (2)

Bellows nut

(6.4)

Body nut

(5.3)

Body nut (1.3)

only with aluminum

angle valves

DN

NPS

Red. seat bore Max. seat bore

15 to 25

½ to 1

150

150

200

30

20

32 to 50

1½ to 2

450

400

1000

60

30

65 to 80

2½ to 3

900

850

2000

100

60

100

4

1400

1050

3000

100

100

150

6

2300

2100

3000

100

100