Burkert Type 2731 - Manual (Page 21)

7.3 installation
Warning!
risk of injury from improper installation!
Non-observance of the tightening torque is dangerous as the
device may be damaged.
▶ Observe the tightening torque (see “Tab. 11: Tightening torques
for diaphragms”).
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. 11: Tightening torques
for diaphragms”).
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. 11: Tightening torques for diaphragms”).
Lower pilot air port
Upper pilot air port
Fig. 18: Pilot air port
21
Installation
english
Type 2730 / 2731 / 2731K