ARI Armaturen STEVI 423 DN300 EN - Manual (Page 8)

Page 8 Rev. 0040318001 0410
Operating and installation instructions
3-way control valves - STEVI
®
423 (DN300)
7.1.2 Stuffing box packing design
Stuffing box packings (pos. 17) require maintenance.
If leaks develop, Immediately tighten hexagon nuts (pos. 22) gradually until the packing
(pos. 17) stops leaking.
The service life of stuffing box packings (pos. 17) can be increased by checking regularly
leakage.
If leaks can no longer be stopped by tightening the nuts, a new packing ring (pos. 17) must
be inserted into the gland.
Replacement of stuffing box packings:
- Remove the actuator. (Refer to operating instructions for actuator!)
- Insert the new packing ring as shown in the Fig. 6.
Damaged stems must also be replaced (refer to item 7.2 for instructions), since a new
sealing will soon start leaking again if the stem is damaged.
ATTENION !
Refer to item 10.0 and 11.0 before dismantling the valve.
Fig. 6: Stuffing box packing
Fig. 7: Split packing ring
If a split packing ring is used,
cut with a chamfer as shown
in Fig. 7.