ARI Armaturen STEVI 451 EN - Manual (Page 17)

Rev. 0040306000 0410 Page 17
Operating and installation instructions
3-way control valves - STEVI
®
450 / 451
7.2.2 Diverting plug design
DN40-150
- Slacken screw joint (pos. 19 and 24) by about 1
turn.
- Loose nuts (pos. 11).
- Detach mounting bonnet (pos. 7).
- Loose nut (pos. 4 or pos. 60).
- Pull plug (pos. 31) with distance bush (pos. 32)
down.
Note:
There is no distance bush (pos. 32) in DN125-150.
- Pull plug (pos. 40) with stem (pos. 41) up and
replace.
Note:
DN125-150: 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)
(bottom)
Fig. 22:
Series 450 DN40-150 with diverting
plug Verteilkegel