ARI Armaturen STEVI 446 EN - Manual (Page 16)

Page 16 Rev. 0040301000 0410
Operating and installation instructions
Str. thr. control valves - STEVI
®
440 / 441, 445 / 446
7.2 Replacement of internal parts
7.2.1 Replacement of plug and stem
- Remove actuator.
(Refer to operating instructions for actuator!)
Series 440/445:
- Loose nuts (pos. 11).
- Detach mounting bonnet (pos. 7).
- Slacken screw joint (pos. 19 or 25) by about 1 turn.
- DN200-250: Slacken nuts (Pos. 38) by about 2-3 turns.
- DN15-100: Extract plug/stem assembly (pos. 3).
- DN125-250: Extract plug (pos. 3) and stem (pos. 5).
- DN125-250: Drive pin (pos. 4) out with a drift.
- DN125-250: Unscrew plug (pos. 3).
- DN125-250: Bolt new parts together, drill and pin them.
- Replace gasket (pos. 9).
- Assemble in reverse order.
- Secure with nuts (pos. 11) and tighten them crosswise.
(For tightening torques refer to item 7.3.1.)
ATTENTION !
Refer to item 10.0 and 11.0 before
dismantling the valve.
Fig. 25: Series 440 / 445 DN125-150 Fig. 26: Series 440 / 445 DN200-250
Fig. 24: Series 440 / 445
DN15-100