2.3 Symbols
used
Danger - hot surfaces!
Danger - corrosive materials!
Hand: indicates general information
and recommendations.
G
Bullet point: indicates the tasks to
be performed.
®
Arrow: indicates the response(s) to
tasks.
Enumeration
sign
3 Definition of terms
Working medium
The medium that flows through the
diaphragm valve.
Control medium
The medium whose increasing or
decreasing pressure causes the diaphragm
valve to be actuated and operated.
Control function
The possible actuation functions of the
diaphragm valve.
4 Intended area of use
The GEMÜ 658 / 688 diaphragm valve
is designed for installation in piping
systems. It controls a
fl
owing medium
by being opened or closed by a control
medium.
The valve may only be used providing
the product technical criteria are
complied with
(
see chapter 6
"Technical data"
)
.
Do not paint the bolts and plastic parts of
the diaphragm valve!
WARNING
Use the diaphragm valve only for the
intended purpose!
®
Otherwise the manufacturer liability and
guarantee will be void.
G
Use the diaphragm valve only in
accordance with the operating
conditions speci
fi
ed in the
contract documentation and in the
installation,operating and maintenance
instructions.
G
The diaphragm valve may only be used
in potentially explosive zones con
fi
rmed
in the declaration of conformity (ATEX).
5 Condition as supplied
to customer
The GEMÜ diaphragm valve is supplied as a
separately packed component.
6 Technical
data
Control medium
Inert gases
Max. permissible temperature of control medium
60 °C
Filling volume:
Diaphragm size
10
25
40
50
lower piston
0.04 dm³
0.08 dm³
0.44 dm³
0.44 dm³
upper piston
0.03 dm³
0.09 dm³
0.47 dm³
0.47 dm³
Working medium
Corrosive, inert, gaseous and liquid media which have no
negative impact on the physical and chemical properties of
the body and diaphragm material.
The valve will seal in both flow directions up to full operating
pressure (gauge pressure).
Operating temperature
max. 150 °C
(dependent on medium wetted materials)
Ambient conditions
Max. ambient temperature
60 °C
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658, 688
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