Burkert 2730 Instructions De Service page 44

TTightening torques for VA formed tube housings (VA)
NOTE
We recommend checking the diaphragm regularly for wear and replacing it in good time, in order to
avoid rupture and consequent leakage of medium.
ATTENTION!
It is not possible for the customer to install an elastomer diaphragm in a drive unit with a PTFE diaphragm and
vice versa. This must be performed in the works.
Replacement diaphragms
DN
15
20
25
32
40
50
Typ 2730/2731/2731K
M
AINTENANCE AND
Tightening torque
(standard values)
DN
Elastomer
diaphragm
[Nm]
8 2,5
15 3,5
20 4
25 5
32 8
40 11
50 18
Id. No.
EPDM
642 140 M
642 141 A
642 142 B
643 644 K
643 645 L
643 646 M
S
ERVICING OF THE
PTFE diaphragm
[Nm]
3,5
4
6
8
10
15
23
Id. No.
FPM
640 598 P 636 336 X
640 599 Q 643 234 G
640 600 D 643 235 H
643 650 V 643 658 Z
643 653 L 643 659 S
643 656 P 643 660 X
V
ALVE
Id. No.
PTFE
WV 3