Samson 3251-E - Page 70

9-12 EB 8052-E EN
Servicing and conversion
Valve versions with anti-rotation xture:
ensure that the clamps (301) are still fas-
tened tight to the plug stem (5.1).
4. Lift the valve bonnet (2) including yoke
(60), plug (5) and plug stem (5.1) up-
wards off the body (1).
5. Remove spiral gaskets (17) from the
body (1) and valve bonnet (2).
6. Valve versions without ow divider:
continue as described in step7.
Valve versions with ow divider:
remove the spiral gasket (126), clamping
element (63) and ow divider (62) from
the body (1).
7. NPS3 and 4 only: undo the seat ring
(221) using a special tool (uAB0100)
and remove it from the body (1).
It may be necessary to rst unscrew a
few studs (13) from the body (1) before
the tool can be positioned properly.
8. NPS3 and 4 only: remove seat (4) and
spiral gasket (127) from the body (1).
9. Clean all parts that have been removed
and the inside of the valve body (seating
surfaces of the gaskets) and check them
to ensure that they are free from dam-
age.
10. NPS3 and 4 only: insert a new spiral
gasket (127) into the body (1) in the seat
bridge area.
11. NPS3 and 4 only: place seat (4) onto
the spiral gasket (127) in the body (1).
12. NPS3 and 4 only: apply a suitable lu-
bricant (114) to the thread and seating
surface of the seat ring (221). Screw the
seat ring (221) by hand a few turns into
the body (1).
13. NPS3 and 4 only: tighten the seat ring
(221) using a special tool (uAB0100).
Observe tightening torques.
14. Valve versions without ow divider:
continue as described in step15.
Valve version with ow divider:
− Place ow divider (62) and clamping
element (63) into the body (1). Make
sure the parts are properly aligned.
− Insert a new spiral gasket (126) on
top on the clamping element (63).
15. Insert a new spiral gasket (17) into the
body (1).
16. Place valve bonnet (2) including yoke
(60), plug (5) and plug stem (5.1) verti-
cally onto the body (1).
Version with V-port plug: place the valve
bonnet (2) onto the body, making sure
that the largest V-shaped port of the
V-port plug faces toward the valve outlet.
See information under 'Mounting the ac-
tuator onto the valve' in the 'Installation'
section.
17. Press plug (5) rmly into the seat (4),
while fastening down the valve bonnet
(2) with the body nuts (14). Tighten the
body nuts (14) gradually in a crisscross
pattern. Observe tightening torques.