EB 8052-E EN 9-13
Servicing and conversion
c) Version with cage and piston
1. Proceed as described under c) ‘Removing
the cage and piston’ in section9.4.3.
2. Proceed as described under f) ‘Installing
the cage and piston’ in section9.4.3.
9.4.2 Replacing the packing
a) Standard and HT packing
Valve versions without anti-rotation xture
1. Loosen threaded bushing (8).
2. Undo the body nuts (14) gradually in a
crisscross pattern.
3. Ensure that the stem connector nut (9) is
still fastened tight to the plug or piston
stem (5.1).
4. Lift the valve bonnet (2) including yoke
(60), plug/piston (5) and plug/piston
stem (5.1) upwards off the body (1) and
set it aside.
5. Unthread the stem connector nut (9) and
lock nut (10) from the plug or piston stem
(5.1).
6. Unscrew castellated nut (92) and lift the
yoke (60) off the valve bonnet (2).
7. Unscrew threaded bushing (8).
8. Pull plug or piston stem (5.1) out of the
valve bonnet (2).
9. Pull the entire packing out of the packing
chamber using a suitable tool.
10. Renew damaged parts. Clean the pack-
ing chamber thoroughly.
11. Standard packing: apply a suitable lu-
bricant (113) to all the packing parts
and to the plug or piston stem (5.1).
HT packing: do not use any lubricant.
12. Insert the plug/piston (5) together with
the plug/piston stem (5.1) vertically into
the valve body (1) and position it in the
seat (4) in the closed position.
Version with V-port plug: align the plug
(5), making sure that the largest
V-shaped port of the V-port plug faces
toward the valve outlet. See information
under 'Mounting the actuator onto the
valve' in the 'Installation' section.
13. Insert a new spiral gasket (17) onto the
valve body (1).
14. Place the valve bonnet (2) over the plug
or piston stem (5.1) onto the body (1).
15. Firmly press the plug or piston (5) 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.
16. Carefully slide the packing parts over the
plug or piston stem (5.1) into the packing
chamber using a suitable tool. Make sure
to observe the proper order (see Fig.9-4
or Fig.9-5).
17. Screw in threaded bushing (8).
18. Place yoke (60) on the valve bonnet (2)
and fasten using the castellated nut (92).
19. Loosely thread lock nut (10) and stem
connector nut (9) onto the plug or piston
stem (5.1).
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