ARI Armaturen STEVI H 488 EN - Manual (Page 8)

Page 2-8 Rev. 0040308000 0410
Operating and installation instructions
3-way/str.thr. control valves - STEVI
®
H 485-488
7.2 Replacement of plug, stem and seat
- Remove actuator. (Refer to operating instructions for actuator!)
Note:
If inlet B is fitted with a dummy flange (Series 486 and Series 488), refer to item 7.3.
- First remove the connection parts of the pipe (Pos. 13, 14, 15)
- Remove retaining ring (pos. 4).
- By pressing down the stem (pos. 7) remove seat ring (pos. 2) with O-ring (pos. 3).
- Plug (pos. 5) and stem (pos. 7) can now be removed.
- Reassemble in the reverse order.
- To facilitate fitting the O-ring (pos. 3), lubricate lightly with grease (commercial EPDM-
compatible grease).
Note:
The plug (pos. 5) can only be replaced complete with stem (pos. 7). Only the seat (pos. 2)
for path B can be dilsmantled.
ATTENION !
Refer to item 10.0 and 11.0 before dismantling the valve.
ATTENION !
the O-ring (pos. 3) must be renewed during reassembly.
Fig. 8: Series 485 Fig. 9: Series 487
Fig. 10: Plug
with soft seal