16
APV_DE3_UK-7_082017.indd
UK
Double Seat Valve
DELTA DE3
Instruction manual: UK - rev. 7
APV
12. Service Instructions
12.2. Dismantling of product-wetted parts (service)
- CU design:
Release the 4 inner hex. screws and take
off the CU adapter.
1. Screw off the stop screw (11).
2. Release the lower safety nut (31). Hold up the lower shaft (3) with a
spanner SW17 to prevent it from turning.
3. Having removed the nut (31), pull the lower shaft (3) off the guide
rod (4).
4. Dismantling of seals from the lower shaft (3)
Stick a peaked object into the lower seat seal (28) and pull the seal
out of the groove. Pull the o-ring (29) out of the groove.
5. Pull off the guide rod to the top.
6. Remove the safety nut (12). Holding up the safety disc (13) with a
spanner SW24 prevents the upper shaft (5) from turning.
7. Lift off the main cylinder (10) with spring cylinder (8) and shaft
bearing (23) (maintenance of spring cylinder, see 12.3).
8. Dismantling of seals from the upper shaft (5)
Stick a peaked object into the upper and middle seat seal and pull
them out of the groove. Afterwards, lift the two supporting rings (26)
and the quadring (27) off the groove.
9. Dismantling of seals from the shaft bearing (23)
Remove the upper shaft seal (24, 25) from the groove. Take the
quadring (22) and o-ring (37) out of the groove.
10. Dismantling of lower shaft seal (24, 25) from the housing
Take the metallic tip of the dismantling tool to stick into the
elastomer seal (25) from the top and pull the seal off to the top.
Then, take the tip of the assembly tool to pull the PTFE seal (24) off
to the top through the housing.
10
11
12
13
14
8
22
23
37
5
28
4
29
28
3
31
24, 25
26, 27
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