GEA Bock FK40 - Manual (Page 14)

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4| Compressor assembly
4.9 Operating mode of the lockable service connections
1
1
3
3
Pipe connection
Pipe connection
2
2
Fig. 17
Opening the shut-off valve:
a) Spindle 1: turn to the left (counter-clockwise) as far as it will go.
—> Shut-off valve fully opened / service connection 2 closed.
Fig. 18
Opening the service connection (2):
b) Spindle 1: Turn ½ - 1 rotation to the right.
—> Service connection 2 opened / shut-off valve opened.
Connection 3 is provided for safety devices and is not lockable.