Doseuro D Series - Page 67

XMPE0PCG125NST020 1st edition - 2020
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TROUBLESHOOTING
Problems
Causes
Solutions
replace the components if
required.
6 - Oil leaks through the filler
cap and drain plug
Loose plugs or damaged
gaskets, to be replaced.
7 - Damaged piston seal
gasket.
Air intake in the oil reservoir
through piston seals.
Scratched piston
Replace the seal gaskets or the
piston
8 - air entering the pump head
Check the presence of inlet air in
the suction pipe. Check junctions
between pipes, seals around the
valve rods, and the connections
of the instruments. Check the
diameter and piping route.
Low discharge pressure
Low flow rate
9 - insufficient suction
pressure
Increase suction pressure.
Reduce the suction height or
increase the liquid level in the
feed tank.
10 - Winding pipe route with
the presence of chokes; pipe
inside diameter smaller than
the valve passage area;
Check diameter and piping route
Excessive noise
1 - air entering the pump head
Check the presence of inlet air in
the suction pipe. Check junctions
between pipes, seals around the
valve rods, and the connections
of the instruments.
If the air is entering through the
stuffing box, adjust or replace it.
2 - foreign material inside the
valve
Inspect valve units. Clean or
replace the components if
required.
3 - excessive lifting of valves
Replace worn parts
4 - pressure relief valve or
other accessories in the
discharge pipe causing noise
A quick closing of the valve,
solenoid valve, or cock will
produce a water hammer. This
pressure wave is transmitted to
the pump resulting in noise.
A pulsation dampener before the
back pressure valve may be
required. A different type of valve
may be required.
The pumped liquid is mixed
with hydraulic chamber oil
The diaphragm is broken
Evaluate the condition of the
components, if damaged.
Replace:
the diaphragm and any "OR"
the oil reservoir, the piston, the
seal gaskets.
Run the filling procedure.
The pressure gauge shows the
pressure
The pressure switch shows the
presence of pressure
The recirculation valve oil
visibly oscillates downwards
The diaphragm is positioned
towards the pump head.
Obstruction on suction path,
excessive pressure drops from
hydraulic circuit.
Calibrate the RESET valve.
Check:
the filter, the shut-off valves
installed along the path.
The recirculation valve oil
The diaphragm is positioned
Calibrate the RECIRCULATION