Burkert 8798 Manuel D'utilisation page 31

Fluidinstallation
9.4.2 Pneumatic connection for process
valves belonging to series 26xx and
27xx
DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
Working connection 2
(connection: A2)
Working connection 1
(connection: A1)
upper chamber
lower chamber
Fig. 33: Pneumatic connection series 26xx and 27xx
Type 8798
The length of this control line should be adapted to the actuator
size because the clearance volumes caused by the control
line can have a negative influence on the control properties.
The following is the case: the smaller the actuator, the more
sensitively the control system reacts to the length of the
pneumatic control line.
Procedure:
Control function A (single-acting actuator):
→
Connect the working connection A1 or A2
8791 or Type 8792/8793 to the lower chamber of the actuator
using a hose.
→
Attach the exhaust airline or a silencer to the upper chamber.
Control function B (single-acting actuator):
→
Connect the working connection A1 or A2
8791 or Type 8792/8793 to the upper chamber of the actuator
using a hose.
→
Attach the exhaust airline or a silencer to the lower chamber.
Control function I (double-acting actuators):
→
Connect working connections A1 and A2 to the respective
chambers of the actuator.
in line with desired safety position (see operating instructions Type 8791
5)
or Type 8792/8793)
english
5) of the positioner Type
5)
of the positioner Type
31