Burkert Type 2731 User Manual
Page 13
pilot pressure for control function a
3)
a
ctuator
size
[mm]
Orifice
dn
(d
iaphragm
size)
[mm]
max. sealed medium pressure [bar]
pressure on one
side
pressure on both
sides
epdm/fkm
ptfe
epdm/fkm ptfe
ш 125
65
7.0
4.0
4.5
2.0
ш 175
65
8.0
5.0
5.0
4.5
80
5.0
4.5
2.5
2.0
ш 225
80
10.0
10.0
6.0
4.5
100
8.0
4.0
3.5
1.5
Tab. 7: Pilot pressure for control function A
3)
required minimum pilot pressure depending on medium pressure
for control function B.
The following graphs indicate the minimum pilot pressure required for
control functions B depending on the medium pressure. The values
are valid for medium pressure on both sides.
To protect the diaphragm during control function B, preferably
do not select the pilot pressure higher than is required to
switch the medium pressure.
control function B / elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
pilot pressure [bar]
m
edium
pressure
[bar]
ø 125 epdm
DN65
Fig. 7: Pressure graph, actuator ø 125 mm, control function B,
elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
pilot pressure [bar]
m
edium
pressure
[bar]
ø 175 epdm
DN80
DN65
DN100
Fig. 8: Pressure graph, actuator ø 155 mm, control function B,
elastomer diaphragm
13
Technicaldata
english
Type 2730 / 2731 DN 65-100