Burkert Type 2051 Manuel D'utilisation page 10

Schematic representation of control function A (B)
Connection 2
Fig. 2: Counterclockwise rotation
(Control function B: Clockwise rotation)
Control air on connection 2 moves the pistons in the direction of the
actuator covers, the springs are tensioned. Rotation is anti-clockwise.
Exhaust air via connection 4.
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Connection 4
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Type 2051
SystemDescription
Connection 2
Fig. 3: Clockwise rotation
(Control function B: Counterclockwise rotation)
Pressure loss or compressed-air failure on connection 2 allows the
springs to move the pistons inwards. Rotation is clockwise. Exhaust
air via connection 2.
Control function I
Double-acting actuator; activation e.g. with pilot valve.
A
P
Connection 4