Closing the valve
The closing process happens in the opposite sequence, therefore the upper
valve seals are first seated before the lower valve seals leave the middle seal
and the lower disc closes. With the downward motion of the valve rod, the
additional disc is opened again.
3.2.2
Actuator Function
The actuator is of the spring-closing type (Z). The valve is closed in the non-
actuated position.
Identification on the T.VIS control top once the installation (SET-UP) has been
completed:
•
Green steady light (1): valve in non-actuated position
•
Yellow steady light (1): valve in end position (actuated position)
Fig.7
3.2.3
Leakage-Proof Shut-Off
Fig.8
Description
Functional description
430BAL008451EN_2
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24.10.2017
