Kv values [m³/h]
Diaphragm
size
DN
DIN
Code 0
DIN 11850
Series 1
Code 16
DIN 11850
Series 2
Code 17
DIN 11850
Series 3
Code 18
SMS 3008
Code 37
ASME BPE
Code 59
EN ISO
1127
Code 60
10
10
-
2.4
2.4
2.4
-
2.2
3.3
15
3.3
3.8
3.8
3.8
-
2.2
4.0
20
-
-
-
-
-
3.8
-
25
15
4.1
4.7
4.7
4.7
-
-
7.4
20
6.3
7.0
7.0
7.0
-
4.4
13.2
25
13.9
15.0
15.0
15.0
12.6
12.2
16.2
40
32
25.3
27.0
27.0
27.0
26.2
-
30.0
40
29.3
30.9
30.9
30.9
30.2
29.5
32.8
50
50
46.5
48.4
48.4
48.4
51.7
50.6
55.2
Kv values determined acc. to IEC 534 standard, inlet pressure 6 bar,
∆
p 1 bar, stainless steel valve body and soft elastomer diaphragm.
Operating pressure [bar]
Control pressure
Diaphragm size
GEMÜ
EPDM/FPM
PTFE
[bar]
10
658
0 -10
0 - 6
4.5 - 6.0
25
688
0 - 10
0 - 6
5.5 - 7.0
40
688
0 - 10
0 - 6
3.5 - 7.0
50
688
0 - 10
0 - 6
5.5 - 7.0
All pressures are gauge pressures. Operating pressure values were determined with static operating pressure applied on one side of a closed
valve. Sealing at the valve seat and atmospheric sealing is ensured for the given values.
Information on operating pressures applied on both sides and for high purity media on request.
Application example
Welds
Functional description
When control pressure is applied, the lower actuator piston
strokes 100 %. The stroke of the upper part of the actuator,
however, can be steplessly limited from 0 % to 100 % by
means of the stroke limiter (item 17) and secured by the lock
nut (item 16).
When a stroke limiter is used, the piston (item 13) moves
against the stroke limiter (item 17) and flow restriction is
possible.
If the lower part of the actuator is under control pressure,
the valve fully opens, pushing the spindle (item 27) upwards
through the upper piston.
Diaphragm temperature range [°C]
Diaphragm
Liquid Media
Steam
(
Sterilisation
)
Code
Min.
Max.
EPDM
-10
90
150 °C, max. 60 min
13
EPDM
-10
90
150 °C, max. 60 min
16
EPDM
-10
90
150 °C, max. 180 min
17
PTFE
-10
90
Constant temperature* 150 °C
52
PTFE
-10
90
Constant temperature* 150 °C
5E
FPM
-10
90
not applicable
4
PTFE
-10
90
150 °C, max. 40 min
5F
* The valves concerned must be serviced regulary if steam is applied continuously.
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