GEM 673 Installation, Operating And Maintenance Instruction page 24

Temperatures
Media temperature
FKM (Code 4/4A)
EPDM (Code 13/3A)
EPDM (Code 17)
EPDM (Code 19)
EPDM (Code 36)
PTFE/EPDM (Code 54)
PTFE/EPDM (Code 5M)
PTFE/PVDF/EPDM (Code 71)
Sterilisation temperature
FKM (Code 4/4A)
EPDM (Code 13/3A)
EPDM (Code 17)
EPDM (Code 19)
EPDM (Code 36)
PTFE/EPDM (Code 54)
PTFE/EPDM (Code 5M)
PTFE/PVDF/EPDM (Code 71)
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
Pipe
standard
Connection
code
Type MG DN
15
25 20
25 13.9
GEMÜ
32 25.3
673
40
40 29.3
50 46.5
50
65
MG = diaphragm size
Kv values determined acc. to DIN EN 60534, inlet pressure 5 bar, ∆p 1 bar, stainless steel valve body (forged body) and soft elastomer diaphragm.
The Kv values for other product configurations (e.g. other diaphragm or body materials) may differ. In general, all diaphragms are subject to
the influences of pressure, temperature, the process and their tightening torques. Therefore the Kv values may exceed the tolerance limits of
the standard.
The Kv value curve (Kv value dependent on valve stroke) can vary depending on the diaphragm material and duration of use.
673
(1)
Kv values [m³/h]
DIN EN 10357 EN 10357
series B series A
(formerly (formerly
DIN 11850 DIN 11850
series 1) series 2) /
DIN 11866
series A
0 16
4.1 4.7
6.3 7.0
15.0 15.0
27.0 27.0
30.9 30.9
48.4 48.4
- -
DIN 11850 SMS
Series 3 3008
17 18 37
4,7 4.7
7.0 7.0
15.0 12.6
27.0 26.2
30.9 30.2
48.4 51.7
- - 62.2
24 / 40
max. 150 °C , max. 60 min per cycle
(2)
max. 150 °C , max. 180 min per cycle
(2)
max. 150 °C , max. 180 min per cycle
(2)
max. 150 °C , max. 60 min per cycle
(2)
max. 150 °C , no time limit per cycle
(2)
max. 150 °C , no time limit per cycle
(2)
Steam input
Steam distribution
ASME BPE / ISO 1127 /
DIN 11866 EN 10357
series C series C /
DIN 11866
series B
59 60
- - 7.4
- 4.4 13.2
12.2 16.2
- 30.0
29.5 32.8
50.6 55.2
61.8 -
-10 ... 90 °C
-10 ... 100 °C
-10 ... 100 °C
-10 ... 100 °C
-10 ... 100 °C
-10 ... 100 °C
-10 ... 100 °C
-10 ... 100 °C
not applicable
not applicable
Process pipe
Sterile process
0 ... 60 °C
DIN ISO
228
1
6.5
10.0
14.0
26.0
33.0
60.0
-