Azbil ACN Series, Руководство пользователя

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12-7
(3/3)
Step Procedure
7
Stack the Belleville spring washers as shown in Fig. 12-5, and insert them into the
packing follower.
2 same-direction washers × 3 3 same-direction washers × 2
[For PTFE yarn] [For expanded graphite]
Fig. 12-5.
8 Place the packing flange onto the packing follower.
9
Apply anti-seizing agent Never-Seez made by Bostik Inc. (Table 12-3) to the threads
on the gland nut end of the gland studs, and screw the nuts on by hand.
(3) Tightening
(1/2)
Step Procedure
1
Tighten the left and right gland nuts alternately, making approximately a half turn
each, until the torque indicated in Table 12-4 or Table 12-5 is reached. Note that if
the tightening torque is insufficient, the amount of leakage may exceed the specified
value. On the other hand, tightening the gland nuts with excessive torque increases
the friction on the stem and causes the gland packing to wear out faster, which may
lead to an amount of leakage exceeding the specified value in a short period of time.
Table 12-4. Gland nut tightening torque (for PTFE yarn)
Model Actuator model Stem size Tightening torque
ACP, ACN
HA2 φ 10 mm 12 N·m
HA3
φ
13 mm 20 N·m
HA3 φ 16 mm 33 N·m
HA4
φ
20 mm 44 N·m
PSA6 φ 30 mm 54 N·m
Table 12-5. Gland nut tightening torque (for expanded graphite)
Model Actuator model Stem size Tightening torque
ACP, ACN
HA2
φ
10 mm 12 → 0 (loosening) → 8 N·m
HA3 φ 13 mm 20 → 0 (loosening) → 13N·m
HA3
φ
16 mm 33 → 0 (loosening) → 22N·m
HA4 φ 20 mm 44 → 0 (loosening) → 30N·m
PSA6
φ
30 mm 54 → 0 (loosening) → 36N·m