GEA VARIVENT, Operating Instruction

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2 Safety
2.1 Intended use
Double-seat valve B is used for the mix-proof separation of incompatible media at
flow path intersections in pipe systems.
The medium should preferably flow in the opening direction of the valve disk to
avoid pipe hammers when the valve is opened or closed.
If the valve is used in the opposite direction (valve closing), a damping cylinder
can be used to avoid pressure drops.
Do not install the valve in spring-opening, as this will open when there is a current
or air failure and leads to product mixing.
In a closed pipe system, hydraulic pressure build-up may occur when the valve
switches and result in seal damage.
The valve is resistant to pressure surges in its closed state.
Hint!
The manufacturer will not accept any liability for damage resulting
from any use of the valve which is not in accordance with the
designated use of the valve. The risk of such misuse lies entirely with
the operator of the facility.
2.1.1 Requirements for operation
The prerequisite for reliable and safe operation of the component is proper
transportation and storage as well as professional installation and assembly.
Operating the unit within the limits of its designated use also involves adhering to
the operating, inspection and maintenance instructions.
2.1.2 Pressure equipment directive
The component is a piece of pressure equipment (without safety function) in the
sense of the pressure equipment directive 2014/68/EU. Classified according to
Annex II in category 1.
According to the scope of directive 2014/34/EC, article 1, paragraph 2, f, the
exception of the directive applies, due to conformity with the machine directive
2006/42/EU.
The nominal diameters smaller than DN 25 are subject to article 4, paragraph 3
of the Pressure Equipment Directive which specifies sound engineering practice.
Nominal diameters ≥ IPS 4“; DN 125 valid for the fluid group II.
In the event of any deviations, GEA Tuchenhagen GmbH will supply a specific
Declaration of Conformity.
2.1.3 ATEX directive
In areas with an explosive atmosphere, only valves suitable for use in such areas
may be used.
Safety
Intended use
430BAL008326EN_3
07.02.2022 9