Samson 3248-1, Mounting And Operating Instructions

Disassembly:

Important!

For actuators with fail-safe action "Actuator
stem extends" and especially actuators with
pretensioned springs, apply a pressure be-
forehand to retract the actuator stem slightly.

1. Remove clamps of the stem connector (7)

between actuator stem and plug stem
and unscrew annular nut (8.2).

2. Lift the actuator off the valve.
3. Place a wrench at the stem connector nut

(6.1) to hold it stationary and loosen the
lock nut (6.2). Unscrew stem connector
nut and lock nut from the plug stem ex-
tension (6.3a).

Caution!

The plug stem extension may not

be twisted at all, otherwise the metal bellows
could be damaged.

4. Unthread guide bushing (5.2) to relieve

the tension from the packing (4.2).

5. Unthread nuts (5.3) at the valve bonnet.

Lift valve bonnet (5) carefully upwards
off the flange of the cryogenic extension
bonnet (1.1).

6. Place the special tool with 24 mm socket

wrench over the plug stem extension
(6.3b) onto the nut (20) in such a way
that the labeling "disassem-

ble/demontieren" faces upwards. (As
the needle bearing of the tool can only
be turned in one direction, it must be
placed turned by 180° as required for
assembly or disassembly.)
Insert 17 mm socket wrench and un-
screw the top section of the plug stem
extension (6.3a) with socket wrench.

7. In case of DN 100 and 150 (NPS 4 and

6), unscrew nut (20). In case of DN 25
to 80 (NPS 1 to 3) the nut remains on
the plug stem extension.

8. Insert seal (24) and fit on protective cap

(23).

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

to the protruding thread of the plug stem
extension to prevent dirt and moisture
from entering the plug stem extension.

10. Screw on nut (22) and hand tighten to

extract the plug stem extension to the di-
mension

h (Table 2). Do not tighten

more than 10 Nm, otherwise the metal
bellows will be damaged.

11. Tighten nut (5.3) (tightening torque in

Table 2).

12. Insert stopper (25).

12

EB 8093 EN

Version with split plug stem extension

Table 2

Version with split plug stem extension

Nominal size

Tightening torque Nm

Dimension h

Nut (22)

Nut (5.3)

Plug stem extension (6a)

mm/inch

DN

NPS

Class 150/300/600

15 to 80

1 to 3

Max. 10

(hand tight)

30

50

15/ 0.6

100/150

4 to 6

50

80

26/1.0