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172-65162M-03 (BT3N/MBT3N/PBT3N) 5 Jul 2013
MBT3N: Operational Check of the Motor Unit and Bypass Valve Section
1. An operational check shall be performed at least once every 6 months.
2. Turn the motor unit power ON and check the operation of the motor unit (angle of
rotation, time required to open/close the valve, sound).
3. After turning the motor unit power OFF, manually operate the valve, check for
foreign matter in the valve and confirm torques.
Refer to the following table for tightening torques. A torque of more than 2 times
the shown torque is considered abnormal, and an inspection should be performed.
Tightening Torque N·m
No load
0.5 MPaG load
1.0 MPaG load
0.4 0.5 0.6
(
1 N·m
≈
10 kg·cm) (1 MPa = 10.197 kg/cm
2
)
PBT3N: Operational Check of the Actuator Unit and Bypass Valve Section
1. An operational check shall be performed at least once every 6 months.
2. Making sure there is air supplied to the actuator, check the operation (angle of
rotation, time required to open/close the valve, sound).
3. After shutting off the air supply, manually operate the valve, check for foreign
matter in the valve and confirm torques.
Refer to the following table for tightening torques. A torque of more than 2 times
the shown torque is considered abnormal, and an inspection should be performed.
Tightening Torque N·m
No load
0.5 MPaG load
1.0 MPaG load
0.4 0.5 0.6
(
1 N·m
≈
10 kg·cm) (1 MPa = 10.197 kg/cm
2
)
BT3N: Additional Tightening of the Valve Unit Gland Section
It is possible to further tighten the gland section in the BT3N valve unit.
Holding the handle tightly, by hand, so that it cannot rotate, use a wrench to tighten
the locknut at the top of the handle (distance across flats: 10 mm).
Cautions when applying additional tightening:
•
Do not tighten the locknut completely the first time. Do not tighten it any more than
is necessary to stop leakage.
•
If leakage continues even after applying additional tightening to the locknut, replace
parts (part No. 16, spindle; part No. 18, gland gasket; part No. 22, gland packing;
part No. 28, locknut).
