Gemü 8258 Original Einbau- Und Montageanleitung Seite 23

7 Transport and storage
7.1 Transport
Transport the solenoid valve carefully.
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Avoid knocks and vibration.
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7.2 Storage
Store the solenoid valve free from dust
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and moisture in its original packaging.
Store the solenoid valve only with the
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connections blocked off .
Avoid UV rays and direct sunlight.
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When storing over a longer period of
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time do not exceed storage temperatures
from -10 °C to +20 °C. Raised storage
temperatures may lead to a reduced life
of sealing materials.
Solvents, chemicals, acids, fuels or
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similar fl uids must not be stored in the
same room as valves and their spare
parts.
8 Functional description
The GEMÜ 8258 indirectly controlled
2/2-way solenoid valve has a brass valve
body and a detachable electrical coil
encapsulated in glass fibre reinforced epoxy
resin. All medium wetted parts are made of
stainless steel, NBR, PVDF or brass.
8.1 Normally closed (NC)
Functional description (NC)
Switch position closed
The compression spring 5 in the armature 6
closes the pilot seat 7. The diaphragm 2
is pushed down onto the main valve
seat 1 by a closing spring 3. The medium
fl ows through the control aperture 4 in the
diaphragm into the control chamber above
the diaphragm and thus increases the
closing force.
Switch position open
When voltage is applied, the armature 6 is
attracted to the pole surface of the bush.
The pressure of the medium from the control
chamber reduces towards the valve outlet
through the open pilot seat 7. More medium
fl ows away through the pilot seat 7 than
can fl ow in through the control aperture 4
in the diaphragm. The diff erential pressure
produced lifts the diaphragm 2 thus opening
the main valve seat 1.
The solenoid valve has a manual override 8
as an option.
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