Eliminating suction problems (only for single ball
valves with PTFE ball seat)
For suction problems occurring during start up:
–
Exclude the possibility that there are foreign
bodies in the valve.
–
Place the valve on a stable surface.
–
Using a hammer (1) and a brass bar (2), gently
tap the PTFE ball seat above the valve ball -
see figure below.
–
Then with the valve in a damp condition allow it
to prime.
8.2 Calibrate the stroke control drive (optional)
The stroke control drive is calibrated to the capacity ordered ex-
factory. Please contact ProMinent in the event that you want the
stroke control drive to be calibrated to another capacity.
Fig. 15: Tapping the valve set disc
Start up and operation
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