172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
16
Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
When using this product, be sure NEVER to stand close to, or leave tools
anywhere near, moving parts such as a shaft. Contact with moving parts
or objects becoming caught in moving parts could lead to injury,
damage or other accidents.
CAUTION
Operational Check of the Actuator Unit and Valve Unit
1. An operational check shall be performed at least once every 3 months.
2. Begin the supply of electricity to the actuator unit, and check the operation (angle
of rotation, time elapse for open/close, sound).
3. After shutting off the supply of electricity to the actuator unit, manually operate the
valve and check for foreign matter in the valve and check that the torque for
opening and closing force (rotational torque) is as it should be.
To do this, refer to the table of rotational torques found below. If a torque exceeds
twice the value of that found in the table, it is an abnormal torque and an
inspection should be performed.
Size
(mm)
Rotational Torque (N∙m)
No Load
1.0 MPaG Load
15
0.8
1.1
20
1.1
2.0
25
2.9
4.9
32
3.6
6.6
40
10.0
15.1
50
12.0
19.0
(1 N∙m
≈
10 kg∙cm)