Operating instructions
GEFA / DOMINO valve AT 200F (ATEX II 1D/2DG c)
AT200F-ATEX-Betriebsanleitung (GB).doc (ZA) 21.09.2007
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Putting into operation
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Flush the pipe and valve and clean them of any impurities (e.g. welding residue).
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Before finally putting the valves into service, all the important elements (plate, spindle, piston rod, etc.) must be
cleaned thoroughly. Any damage to the plate, especially to the seal as a result of sand-blasting debris or
welding beads, external rust, etc., is not covered by the warranty.
Cleaning agents that include solvents especially those based on aromatic hydrocarbons (thinners, petroleum
spirit and the like) must not be allowed to get into contact with the seal.
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Actuators must be mounted in alignment to the valve stem. Wrong mounting will lead to a higher wear of the
stem packing or cause leakage.
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The mounted actuator must not cause a thrust load on the valve shaft. If necessary the actuator must be
fastened / supported. NOTE: In case of moving pipelines the fastening of the actuator must not be rigid.
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Pneumatic or hydraulic actuators must be operated with the agreed design pressure. The actuator’s maximum
permissible operating pressure must be observed.
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Check that all the required connections (e.g. electrical connections, compressed air hose connections) have
been plugged in and the connectors are secure.
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When shutting off powdery or granular media, ensure that any wetness or humidity caused by the installation
work and which might cause a subsequent caking of the medium must be thoroughly removed before the
installation is started up when using the medium. Malfunctions of the valve caused by agglutination or caking of
powdery media are not covered by the warranty.
•
Danger
by static charging:
To protect against static charging the valve has to be grounded.
The gate is connected conductively with the body by an antistatic device.
Since the housings are plastic coated, a conductive connection of the pipe flange via a respective seal is
not
guaranteed.
For a conductive connection between valve and pipe the thread blind holes in the upper area of the body can be
used. Those thread blind holes are not coated.
To ensure a durable conductive connection toothed lock washers have to be placed under at least two screw
heads of the screws for the thread blind holes.
It has to be taken into account that the pipe flange is free of isolating coatings in the area of these tooth lock
washers.
If the valve shall be grounded directly, then the grounding latches can be connected to the gate on the antistatic
device.
•
Check the function of the valve. If the function valve might not work properly, the valve must be replaced.
Pneumatically-operated valves
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Before initial operation, all the air lines provided by the customer as well as the pneumatic control valves must
be thoroughly blown and also cleaned if necessary.
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We recommend the use of lightly oiled compressed air to actuate the cylinder. In operation, 1-2 drops per 1000
litres of air will be sufficient.
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Unless explicitly stated otherwise when ordering, pneumatic control valves installed by us are supplied without
accessories such as chokes or silencers. The stipulations at the customer’s site must be followed.
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Pneumatically-operated valves should not be closed suddenly, as otherwise there is a risk of pressure shock.
Hydraulically-operated valves
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Before initial operation, all the control lines provided by the customer must be thoroughly cleaned.
•
Hydraulically-operated valves should not be closed suddenly, as otherwise there is a risk of pressure shocks.
Choker valves set at the factory must not be altered.