18 I DELLMECO I AODD DIAPHRAGM PUMPS
9. Operation
9.1. Method of operation
1) Start the air compressor.
2) Open the air valve. Using a regulator adjust the supply air pressure to within the permissible range.
3) Open the flow valve on the discharge side.
4) First, check that fluid is flowing inside the piping and is being pumped to the discharge side, and then fully open
the air valve.
9.2. Flow adjustment
Adjust the flow valve on the discharge side, or adjust the supply air pressure.
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CAUTION
!
CAUTION
!
CAUTION
Before starting the pump, check that all piping is properly connected.
Before starting the pump, check that
all the bolts are securely tightened.
Check that the regulator and the drain valve on the discharge side are closed and that the valve on
the suction side is opened.
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Do NOT open the air valve suddenly.
The supply air pressure may initially rise during closing the flow valve. Make sure that the pressure is kept
within the normal operating range.
The permissible suction flow speed can vary depending upon the viscosity and specific gravity of the fluid,
the suction stroke and other factors. However in case of a rapid growth of the pump speed (flow speed of
fluid), cavitation will occur. This will reduce pump performance and may cause a malfunction. In order to
prevent cavitations, adjust the supply air pressure and the flow.
If fluid is not discharged after you start the pump, or if you hear an abnormal noise or notice any
irregularity, shut down the pump immediately.
