172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
17
Additional Tightening of the Valve Unit Gland Section
It is possible to further tighten the gland section in the valve unit. When there is
leakage from the gasket or seal, tighten the gland section further using the following
instructions:
1. Detach the actuator unit.
2. Follow the steps given below to apply additional tightening:
1) Loosen the holder screw.
2) Screw the holder further in with a socket wrench.
3) Retighten the holder screw.
Cautions to observe when applying additional tightening:
•
Do not tighten the holder completely the first time. Tighten the holder only as
much as necessary to stop leakage.
•
If leakage continues even after the holder has been tightened, replace worn parts
(gland section or valve unit).
Valve
Connection Size
(mm)
Socket Distance
Across Flats
(mm)
15 to 25
17
32 to 50
27
Holder Screw
Holde
Allen Wrench
2 mm across flat
Socket
