ARI Armaturen STEVI 460 DN 15-250 EN - Manual (Page 14)

Page 14 Rev. 0040304000 0410
Operating and installation instructions
Straight thr. stop valves - STEVI
®
405 / 460 (DN15-250)
7.2 Replacement of internal parts
7.2.1 Replacment of plug and stem
- Remove actuator. (Refer to operating instructions for actuator!)
Series 405:
- Loose nuts (pos. 11).
- Detach mounting bonnet (pos. 7) respectively stuffing box housing (pos. 38).
- DN15-100: Slacken screw joint (pos. 19 or 29) by about 1 turn.
- DN125-250: Slacken hexagon nuts (pos. 35) by about 2-3 turns.
- Extract plug (pos. 3) and stem (pos. 5).
- Drive pin (pos. 4) out with a drift.
- Pin new parts.
- Replace gasket (pos. 9).
- Assemble in reverse order.
- Secure with nuts (pos. 10) and tighten them crosswise.
(For tightening torques refer to item 7.3)
Series 460:
For replacement of plug and stem with bellows sealing (Series 460) refer to item 7.1.3.
ATTENTION !
Refer to item 10.0 and 11.0 before dismantling the valve.
Fig. 16: Series 405 DN15-100 Fig. 17: Series 405 DN125-150