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Operating Instructions
CAUTION!
Preloaded spring assemblies!
Valves with the fail safe closing (FC) function are equipped with preloaded spring assemblies. By loosening the fastening screws on
the flow body, the spring assemblies are relieved to such an extent that the actuator can be opened without additional equipment.
Valves of the „spring force opening" (FO) function do not have preloaded spring assemblies and the actuators may only be opened at
the factory. For detailed mounting instructions, please refer to the mounting instructions supplied with the compliant spare parts kit.
► Do not open valves with function FO yourself.
7.3.2
Installation of the sealing diaphragm
Proceed in reverse order.
► Serrez les boulons ou les écrous en croix.
Type
DN65
DN80-150
Tightening torques
d
mm
75
90
110
160
Note: For valves with built-in stroke limitation, it is recommended to readjust the valve after reassembly.
DN
mm
65
80
100
150
Pneumatic diaphragm valve DIASTAR 025
Tighten crosswise
3.
2.
4.
8.
2.
6.
Inch
2 1/2
3
4
6
1.
3.
5.
1.
7.
4.
Tightening torque
25
30
30
40
27
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