ARI Armaturen STEVI 463 EN - Manual (Page 11)

Rev. 0040318000 0410 Page 11
Operating and installation instructions
3-way control valves - STEVI
®
423 / 463
7.2 Replacement of internal parts
7.2.1 Replacement of plug and stem
- Remove the actuator. (Refer to operating instructions for actuator!)
- Slacken nuts (pos. 22) by about 2-3 turns.
7.2.1.1 Mixing plug design
Series 423
- Loose nuts (pos. 7).
- Detach bottom flange (pos. 3).
- Remove plug (pos. 8) with stem (pos. 10).
- Drive pin (pos. 9) out with a drift.
- Unscrew plug (pos. 8).
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 5).
- Assemble in reverse order.
- Secure with nuts (pos. 11) and tighten them
crosswise.
(For tightening torques refer to point 7.3.1)
Series 463
Item 7.1.2 describes how to change mixing plug
and stem in valves with a bellows seal
(series 463).
ATTENION !
Refer to item 10.0 and 11.0 before dismantling the valve.
Fig. 12: Series 423 with mixing plug