ARI Armaturen STEVI 460 DN 300-500 EN - Manual (Page 10)

Page 10 Rev. 0040304002 0410
Operating and installation instructions
Str. thr. stop valves - STEVI
®
405 / 460 (DN300-500)
7.1.2 Stuffing box packings design
Stuffing box packings (pos. 12) require maintenance.
If leaks develop, immediately tighten the hexagon nuts (pos. 18) gradually until the packing
(pos. 12) stops leaking.
The service life of stuffing box packings (pos. 12) can be increased by checking regularly
leakage.
If leaks can no longer be stopped by tightening the nuts (pos. 18), a new packing ring
(pos. 12) must be inserted into the gland.
Replacement of stuffing box packings:
- Remove actuator. (Refer to operating instructions for actuator!)
- Insert the new packing ring as shown in Fig. 7 - Fig. 8
Damaged stems must also be replaced (refer to item 7.2 for instructions) since a new
sealing ring will soon start leaking again if the stem is damaged.
ATTENTION !
Refer to item 10.0 and 11.0 before dismantling the valve.
Fig. 7
Fig. 8: split packing ring
If a split packing ring is used, cut with a
chamfer as shown in Fig. 8.