Operating instructions

When operating the integral relief valve close to the opening

pressure, a minimal overflow into the overflow line can occur.

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.

Only adjust the stroke length when the pump is running. This

is easier and also better for the pump.

20 0

75%

30%

P_SI_0095_SW

Fig. 23: Adjusting the stroke length

n 100 % = 4 rotations

n 25 % = 1 rotation

n 0.5 % = 1 scale mark on stroke adjustment dial

Correctly adjusting the pump:

n Select as large a stroke length as possible for viscous feed chemicals.

n Select as large a stroke length as possible for outgassing feed chemi‐

cals.

n Select as high a stroke rate as possible for good mixing.

n Do not set the stroke length at less than 30 % for precise dosing.

Fig. 22: Tapping the valve set disc

Adjusting the stroke length

Start up