bürkert 2730 Bedienungsanleitung Seite 16

7.3.1 installation of the valve body
Welded bodies
→
Weld valve body in pipeline system.
Other body versions
→
Connect body to pipeline.
7.3.2 installation of the actuator (welded
body)
installation for actuator with control function a:
notiCe!
damage to the diaphragm or the seat contour!
▶ When installing the actuator, ensure that the valve is in open
position.
→
Control function A pressurize the lower pilot air port with com-
pressed air (5 bar): valve opens.
→
Lightly cross-tighten the body screws until the diaphragm is
between the body and actuator.
do not tighten the screws yet.
→
Actuate the diaphragm control valve twice.
→
Without pressurization tighten the body screws to the permitted
tightening torque (see following table "Tab. 7: Tightening torques
for diaphragms").
16
english
Type 2730 / 2731 DN 65-100
Installation
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. 7: Tightening torques for diaphragms").
Fig. 11: Pilot air port
tightening torques
Orifice dn tightening torques for diaphragms [nm]
(diaphragm size)
epdm
65 20
80 30
100
40
Tab. 7: Tightening torques for diaphragms
Upper pilot air port
Lower pilot air port
ptfe
30
40
50