Samson 3251 - Page 75

EB 8052 EN 9-13
Servicing
b) Version with insulating sec-
tion
Standard packing (PTFE)
1. Unscrew the castellated nut (92) and lift
the yoke (3) off the insulating section
(21).
2. Undo the body nuts (14) gradually in a
crisscross pattern.
3. Lift the insulating section (21) and plug
with plug stem (5) off the body (1).
4. Unscrew the stem connector nut (9) and
lock nut (10) from the plug stem.
5. Unscrew the threaded bushing (8).
6. Pull the plug with plug stem (5) out of the
insulating section (21).
7. Pull the entire packing out of the packing
chamber using a suitable tool.
8. Renew the damaged parts and carefully
clean the packing chamber.
9. Apply a suitable lubricant to all the pack-
ing parts and to the plug stem (5).
10. Slide the plug with plug stem (5) into the
insulating section (21).
11. Place the insulating section (21) together
with the plug stem and plug (5) onto the
body.
Version with V-port plug: place the insu-
lating section (21) onto the valve body,
making sure that the largest V-shaped
port of the V-port plug faces towards the
valve outlet.
Version with perforated plug: place the
insulating section (21) onto the valve
body, making sure that the hole of the
plug that releases the ow rst faces to-
ward the valve outlet.
See relevant section 'Mounting the actua-
tor onto the valve' in the 'Installation'
chapter.
12. Carefully slide the packing parts over the
plug stem into the packing chamber us-
ing a suitable tool. Observe the proper
sequence (see Fig.9-3).
13. Firmly press the plug (5) into the seat (4).
Fasten down the insulating section (21)
with the body nuts (14). Tighten the nuts
gradually in a crisscross pattern. Ob-
serve tightening torques.
14. Screw in the threaded bushing (8) and
tighten it. Observe tightening torques.
15. Place yoke (3) onto the insulating section
(21) and fasten using the castellated nut
(92).
16. Loosely screw the lock nut (10) and stem
connector nut (9) onto the plug stem.
ADSEAL packing
1. Proceed as described in “Standard pack-
ing (PTFE)”, steps1 to 11.
2. Carefully slide the packing parts over the
plug stem into the packing chamber us-
ing a suitable tool. Observe the proper
sequence (see Fig.9-4).
3. Slide the seals (15.2) over the plug stem.
Insert the wire of the red spacer ring
(15.1) into the groove of the retaining
ring.
Slide the retaining ring over the plug
stem.