GEA VARIVENT DN 25, Инструкция по эксплуатации

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3.2 Functional description
3.2.1 Leakage-Proof Shut-Off
The upper and the lower valve housing are each equipped with a sealing surface
to the valve disks. The chamber between the two valve disks is connected to the
open environment by an isolation outlet integrated into the lower valve stem. In
the event of seal damage, the leaking fluid can safely flow into the open.
Defective seals can thus easily be detected. Under normal operating conditions,
liquid from one pipe is prevented from entering the other pipe.
3.2.2 Cleaning function
A cleaning liquid is supplied to the leakage drain system via a separate
connection (1) arranged in the lantern. The cleaning fluid is sprayed into a cavity
between both of the valve discs over a ring nozzle (2) and flows out through a
drain free of pressure.
Fig.6
The cleaning of the leakage drain system occurs independently from the opening
and closing of the valve.
The cleaning fluid flows out of a CIP-cleaning unit.
Cleaning fluid data:
• Service pressure: min. 2 bar (29 psi), max. 5 bar (72.5 psi)
•
Service temperature: max. 135 °C (275 °F)
3.2.3 Actuator Function
The actuator is of the spring-closing type (Z). The valve is closed in the non-
actuated position.
Description
Functional description
430BAL008386EN_3
20 07.02.2022