21
Pump head repair
Torques
Exchanging the ball valves
Note:
The ball and position of the valves have been harmo-
nized to each other. Insert the valves in the direction of
flow!
Fig. 21
Functional principle of the ball valve
Dirty ball valves do not open and close properly. They cause pres-
sure fluctuations and irregular flow.
Purge the pump head before changing the ball valve.
Removing the ball valves
Note:
Loosen the screw fittings of the capillary connections
alternately, to prevent the capillaries from bending.
1. Unscrew the inlet fitting 2 (A) and capillary fitting (B).
2. Unscrew outlet fitting 1 (C).
3. Remove the ball valve.
4. Unscrew inlet fitting 1 (E).
5. Remove the ball valve.
No.
Torque
Wrench
C, K
7.5 Nm
Size 10
D
5 Nm
1/4"
E, J
15 Nm
Size 13
Legend
A
Ball valve
B
Ball (dotted line)
C
Flow direction
(arrow)
B
A
C