Azbil HLS Series User Manual

10-5
Step 7:
Being careful not to damage the surface of the stem, install the packing flange.
Step 8:
After applying the anti-seize compound indicated in Table 10-3 [Never-Seez made by Bostik,
Inc., in the U.S.] to the surface of the threads of the stud bolts and the bearing surface of the
nuts, tighten them by hand.
3. Tightening
Step 1:
With reference to Fig. 10-5, check the position of the Belleville springs through the front
window of the spring case. When the Belleville springs are set properly, the lower edge of the
outer diameter of the lowest Belleville spring almost coincides with the lower scale mark of the
spring case. (In some cases, it does not exactly coincide because of the dimensional tolerance
of the Belleville springs.)
Front appearance
of the spring case
Scale marks
Lower edge of the
outer diameter
of the lowest piece
Before tightening
After tightening with
the specied torque
Fig. 10-5. Loading conditions of the Belleville springs
Step 2:
Tighten each of the right and left gland nuts by half a turn alternately to the specified torque.
Table 10-4 shows the tightening torque.
If the tightening torque is less than the specified value, be aware that the amount of leakage
may exceed the specified value because of insufficient tightening.
If the tightening torque is more than the specified value, be aware that the amount of leakage
may exceed the specified value in a short period of time because of the accelerated wear of the
gland packing, in addition to the increased sliding friction of the stem.
Table 10-4. Tightening torque of the gland nuts
Actuator model Stem size Tightening torque
PSA1, HA2
φ
10 mm 8 to 10 N·m
HA2, HA3
φ
13 mm 13 to 16 N·m
HA3
φ
16 mm 22 to 26 N·m
HA4
φ
20 mm 29 to 35 N·m

Azbil HLS Series Specifications

General

Brand	Azbil
Model	HLS Series
Category	Control Unit
Language	English