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8. Taking the product out of operation
The following shutdown procedures will apply for the CVM pumps
in most normal shutdown situations. If the pump will be out of
operation for a long time, follow the storage procedures in section
8.3 Long-term shutdown.
8.1 General procedure
• Always close the outlet gate valve before stopping the pump.
Close the valve slowly to prevent hydraulic shock.
• Switch off and lock off the power supply to the motor.
8.2 Short-time shutdown
• For overnight or temporary shutdown periods under
non-freezing conditions, the pump may remain filled with
liquid. Make sure the pump is fully primed before restarting.
• For short or frequent shutdown periods under freezing
conditions, keep the liquid moving within the pump housing
and insulate or heat the pump exterior to prevent freezing.
8.3 Long-term shutdown
• For long shutdown periods, or to isolate the pump for
maintenance, close the inlet gate valve. If no inlet valve is
used and the pump has positive inlet pressure, drain all liquid
from the inlet line to stop the liquid flow into the pump inlet.
Remove the plugs in the pump drain and vent holes, as
required, and drain all liquid from the pump housing.
• If there will be freezing conditions during long shutdown
periods, completely drain the pump and blow out all liquid
passages and pockets with compressed air. Freezing of the
pumped liquid can also be prevented by filling the pump with
antifreeze solution.
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