21 I DELLMECO I AODD DIAPHRAGM PUMPS
12.2. Pump runs, but fluid does not come out
Cause
Action to take
The suction lift or discharge head is long.
Confirm the piping configuration and shorten
the length.
The discharge-side fluid piping (including the strainer) is
clogged with sludge.
Check and clean the fluid piping.
The valve on the suction side is not open.
Open the valve on the suction side.
The pump is clogged with sludge.
Disassemble the casing, check and clean.
The balls and valve seats are worn out or damaged.
Disassemble the pump, check and replace parts.
12.4. Liquid leakage from exhaust port (silencer)
Cause
Action to take
Damaged diaphragms.
Replace the diaphragms.
12.3. Flow (discharge volume) decreased
Cause
Action to take
The supply air pressure is low.
Check the compressor and configuration of air piping.
Air piping or peripheral equipment is clogged with sludge.
Check and clean the air piping.
The discharge-side flow valve opens differently.
Adjust the discharge-side flow valve.
Air is taken in together with fluid.
Replenish fluid and check the configuration of the
suction-side piping.
Cavitations occur.
Adjust the supply air pressure and discharge pressure,
and shorten the suction lift.
Chattering occurs.
Adjust the supply air pressure and discharge pressure.
Reduce inlet flow valve to adjusting liquid pressure and
volume.
The fluid piping (including the strainer) is clogged with
sludge.
Check and clean the fluid piping and strainer.
The exhaust port (muffler) of the pump is clogged with
sludge.
Check and clean the exhaust port and muffler.
The pump is clogged with sludge.
Disassemble the casing, check and clean.
