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 650 diaphragm valve is
designed for installation in piping
systems. It controls a flowing medium
by being closed or opened by a control
medium.
The valve may only be used providing
the product technical criteria are
complied with (see chapter 5
"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 specified in the contract
documentation and in the installation,
operating and maintenance
instructions.
G
The diaphragm valve may only be used
in potentially explosive zones confirmed
in the declaration of conformity (ATEX).
5 Technical
data
Temperatures
Medium temperature
-10 to 100 °C
Sterilisation temperature
(1)
EPDM (code 13/3A)
max. 150 °C
(2)
, max. 60 min per cycle
EPDM (code 17)
max. 150 °C
(2)
, max. 180 min per cycle
EPDM (code 19)
max. 150 °C
(2)
, max. 180 min per cycle
EPDM (code 36)
max. 150 °C
(2)
, max. 60 min per cycle
PTFE/EPDM (code 54)
max. 150 °C
(2)
, no time limit per cycle
PTFE/EPDM (code 5M, 5Q)
max. 150 °C
(2)
, no time limit per cycle
PTFE/PVDF/EPDM (code 71)
not applicable
¹ The sterilisation temperature is valid for steam (saturated steam) or superheated water.
² If the sterilisation temperatures listed above are applied to the EPDM diaphragms for longer periods of time,
the service life of the diaphragms will be reduced. In these cases, maintenance cycles must be adapted accordingly.
This also applies to PTFE diaphragms exposed to high temperature fluctuations.
PTFE diaphragms can also be used as moisture barriers; however, this will reduce their service life.
The maintenance cycles must be adapted accordingly.
GEMÜ 555 and 505 globe valves are particularly suitable for use in the area of steam generation and distribution.
The following valve arrangement for interfaces between steam pipes and process pipes has proven itself over time:
A globe valve for shutting off steam pipes and a diaphragm valve as an interface to the process pipes.
Ambient temperature
0 ... 60 °C
Steam input
Process pipe
Steam
distribution Sterile
process
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).
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