Burkert Type 2731 - Manual (Page 18)

installation for actuator with control functions B:
→
Lightly cross-tighten the body screws without pressurization until
the diaphragm is between the body and actuator.
do not tighten the screws yet.
→
Pressurize upper pilot air port of the actuator with compressed
air (5 bar).
→
Actuate the diaphragm control valve twice.
→
With pressurization tighten the body screws to the permitted tight-
ening torque (see “Tab. 8: Tightening torques for diaphragms”).
Lower pilot air port
Upper pilot air port
Fig. 13: Pilot air port
tightening torques
Orifice dn
(diaphragm size) tightening torques for diaphragms [nm]
epdm
ptfe
65 20 30
80 30 40
100 40 50
Tab. 8: Tightening torques for diaphragms
7.4 insert
An insert is enclosed for devices which are supplied without a dia-
phragm and valve body. This insert is required only when an elastomer
diaphragm (EPDM / FKM) is used.
For installation of a device with elastomer diaphragm:
→
Place the insert in the groove of the thrust piece.
Insert
Thrust piece
Fig. 14: Installation of the insert
18
Installation
english
Type 2730 / 2731 DN 65-100