Possible problems
It takes too much time before the vent valve closes (the vent valve closes after a few minutes or in extreme
conditions the vent valve does not close at all). This can occur when the unit is connected to an empty vessel
or whenever there is no backpressure.
Solution
Adjust the vent valve by using a precision shim of 0.5 mm (0.02 in) thickness. The stroke of the vent valve
piston may not be larger than 0.5 mm. Check the stroke of the vent valve piston by pulling the shaft with the
two nuts away from the vent valve housing and use the precision shim to measure the distance between the
nuts and the vent valve housing.
If this distance is larger than 0.5 mm, tighten the nuts until the distance becomes 0.5 mm. This will result in
a venting time of 5 to 25 seconds in case of a unit connected to an empty vessel. The smaller the piston stroke,
the smaller the venting flow and venting time.
If the stroke of 0.5 mm is too much for the application, the stroke can be decreased further by tightening the
nuts more until a satisfied venting time is reached. When the stroke is set to less than 0.5 mm, check that the
vent valve still vents enough for the motor to start in under minimal voltage conditions on a pressurized vessel.
Instruction book
2920 7002 03 37
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