ARI Armaturen STEVI 451 EN - Manual (Page 18)

Page 18 Rev. 0040306000 0410
Operating and installation instructions
3-way control valves - STEVI
®
450 / 451
DN125v-150v
- Loose nuts (pos. 24).
- Loose nuts (pos. 11).
- Detach stuffing box housing (pos. 39).
- Loose nut (pos. 4).
- Pull plug (pos. 31) down.
- Pull plug (pos. 40) with stem (pos. 41) up and
replace.
- Bolt new parts together, drill and pin them.
- Unscrew seat rings (pos. 2 bottom and top) and
renew or recondition
(For tightening torques refer to item 7.3.)
- Replace gasket (pos. 9).
- Assemble in reverse order.
(For tightening torques refer to item 7.3.)
- Secure with nuts (pos. 11) and tighten them
crosswise.
(For tightening torques refer to item 7.3.)
(top)
(bot.)
Fig. 23:
Series 450 DN125v-150v with div. plug