GF Type PA 30 FC/FO/DA, Instruction Manual

Page: 10 / 40

10
Pneumatic Actuator PA30-90 with Metal Butterfly Valve Type 038 and 039 Instruction Manual
4.3 Functional prinziple DA/FC/FO
FC/FO
Single-acting
DA
Double-acting
Product
Function
2 4
2 4
FC: The compressed air supply causes the cylinders to
move outwards against the spring tension, until they
reach their end position. Without compressed air, the
drive is automatically closed by the spring force.
FO: The compressed air supply causes the cylinders to
move inwards against the spring tension, until they
reach the end position. Without compressed air, the
actuator is automatically opened by the spring force. The port 2 is in connection with the cylinder side
chambers. Supplying pressurised air in port 2, the
actuator drive shaft rotates counter clockwise to open.
While the port 4 is in connection with the pressurised
intermediate chamber, the drive shaft rotates clockwise
to close.
Operating
diagram
2
4
1 3
2
2
4
1 5
2 4
3
Torque characte-
ristics
To
rque
0° 90° 0°
VALVE VALVE
AIR ACTION SPRING ACTION
VALVE
CLOSED OPEN CLOSED
2
3
To
rque
0° 90° 0°
VALVE VALVE
AIR ACTION AIR ACTION
VALVE
CLOSED OPEN CLOSED
2
3