Burkert Type 2731 - Manual (Page 15)

required minimum pilot pressure depending on medium pressure
for control function B.
The values in the following graphs apply to:
• Plastic body PVDF (PD), PP (PP), PVC (PV)
• Forged steel body (VS)
• Precision casting body (VG)
• Stainless steel body (VA) with
ISO- weld end connection
ISO clamp connection
Threaded connection
Welded neck flange
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 80 epdm
DN15 DN20 DN25
Fig. 7: Pressure graph, actuator ø 80 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]
ш 100, ш 125 epdm
DN32 DN40 DN50
Fig. 8: Pressure graph, actuator ø 100 mm and ø 125 mm,
control function B, elastomer diaphragm
control function B / ptfe 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]
ш 80, ш 100, ш 125 ptfe
DN32 DN40 DN15 DN20 DN25
DN50
Fig. 9: Pressure graph, actuator ø 80 mm, ø 100 mm and
ø 125 mm, control function B, PTFE diaphragm
15
Technicaldata
english
Type 2730 / 2731 / 2731K