ARI Armaturen STEVI 446 EN - Manual (Page 13)

Rev. 0040301000 0410 Page 13
Operating and installation instructions
Str. thr. control valves - STEVI
®
440 / 441, 445 / 446
7.1.2 Stuffing box packing design
- The stuffing box packing (pos. 23) requires maintenance.
- If leaks develop, immediately tighten the screw joint (pos. 25) gradually until the packing
(pos. 23) stops leaking.
- The service life of stuffing box packings (pos. 23) can be increased by checking regularly
leakage.
- If leaks can no longer be stopped by tightening the screw joint (pos. 25), a new packing
ring (pos. 23) must be inserted into the gland.
Replacement of stuffing box packings:
- Remove actuator. (Refer to operating instructions for actuator!)
- Insert new packing ring as shown in Fig. 19 - Fig. 21.
Damaged stems must also be replaced (refer to item 7.2 for instructions) since a new ring
pack will soon start leaking again if the stem is damaged.
ATTENTION !
Refer to item 10.0 and 11.0 before dismantling the valve.
Fig. 19: Stuffing box packing
DN15-150
Fig. 20: Stuffing box packing
DN125v-150v / DN200-250
Fig. 21: Split packing ring
If a split packing ring is used, cut with a chamfer
as shown in Fig. 21.