Burkert 8798, Руководство по эксплуатации

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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
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 5) of the positioner Type
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
5)
of the positioner Type
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.
5)
in line with desired safety position (see operating instructions Type 8791
or Type 8792/8793)
english
Type 8798