ARI Armaturen STEVI H 488 EN - Manual (Page 11)

Rev. 0040308000 0410 Page 2-11
Operating and installation instructions
3-way/str.thr. control valves - STEVI
®
H 485-488
7.3.3 Conversion of design with plug with soft sealings
The O-ring (pos. 3) must be removed from the seat ring (pos. 2) to avoid vacuum caused by
changing temperatures.
Note:
With series 487 the pipe connection parts (pos. 15, 14, 13) must be removed at first.
- Remove retaining ring (pos. 4).
- Remove seat ring (pos. 2) with O-ring (pos. 3).
(The seat ring can be removed with the O-ring by pressing down the stem.)
- Remove O-ring (pos. 3) from the seat ring (pos. 2).
- Insert seat ring (pos. 2) without O-ring (pos. 3) in the body (pos. 1).
- Secure it with the retaining ring (pos. 4).
Note:
Fit path B with a blank flange, refer to item 7.3.1 respectively 7.3.2.
7.4 Conversion of straight through- in 3-way-control valve
Refer to item 7.3, but in reverse order.
Note:
With plugs with soft sealing (refer to Fig. 10), the O-ring (pos. 3) has to be inserted in the
seat ring (pos. 2).
ATTENTION !
Refer to item 10.0 and 11.0 before dismantling the valve.