ARI Armaturen STEVI 463 EN - Manual (Page 12)

Page 12 Rev. 0040318000 0410
Operating and installation instructions
3-way control valves - STEVI
®
423 / 463
7.2.1.2 Diverting plug design
Series 423
- Remove the cotter pin (pos. 33).
- Unscrew castle nuts (pos. 32).
- Unscrew V-port plug (pos. 31).
- Loose nuts (pos. 7).
- Detach stuffing box housing (pos. 12).
- Extract plug (pos. 30) and stem (pos. 10).
- Drive pin (pos. 9) out with a drift.
- Unscrew plug (pos. 30).
- Bolt new parts together, drill and pin them.
- Replace 2 gaskets (pos. 5).
- Assemble in the reverse order.
- Secure with nuts (pos. 7) and tighten them
crosswise.
(For tightening torques refer to point 7.3.1)
Series 463
Item 7.1.2 describes how to change diverting
plug and stem in valves with a bellows seal
(series 463).
7.2.2 Replacement of the seat ring
- Remove actuator. (Refer to operating instructions for actuator!)
- Remove plug as described in item 7.2.1.
- Unscrew seat rings (pos. 2 top and bottom) with a special wrench (can be obtained from
the manufacturer).
- Clean thread and sealing taper in body (pos. 1) respectively bottom flange (pos. 3) and
apply with suitable lubricant.
- Replace respectively recondition seat rings (pos. 2 top and bottom).
- Install seat rings (pos. 2 top and bottom). (For tightening torques refer to item 7.3.2.)
- Replace 2 gaskets (pos. 5).
- Assemble in reverse order.
- Secure with nuts (pos. 7) 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. 13: Series 423 with diverting plug