Calibrate The Stroke Control Drive (Optional) - ProMinent Makro TZ Operating Instructions Manual

Start up and operation
Fig. 15: Tapping the valve set disc

8.2 Calibrate the stroke control drive (optional)

50
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.
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.