16
VM 623.0004 GB/07.00 – Ident–Nr. 550 298
12 Flow rate in suction and pressure pipelines too
high.
Flow rate in suction pipeline must not exceed max. 1 m/s, and
in pressure pipeline max. 3 m/s.
13 Motor speed too high. Check speed and current consumption. Check voltage and
frequency against motor rating plate.
14 Delivery pressure too high. Set specified delivery pressure via pressure–relief valve. Pump
outlet pressure must not be exceeded.
15 Foreign bodies in pump. Dismantle pump, remove foreign bodies and smooth damaged
points with oilstone.
Check suction filter and strainer.
16 Damaged ball bearing. Replace ball bearing.
17 Pressure spring fatigued.
Valve seat leaking.
Install new pressure spring.
Install new valve cone.
18 Pressure spring heavily pre–tensioned.
Valve cone stuck in valve housing.
a) Due to foreign body or
b) Operating temperature of plant substantially
higher than quoted on order.
Release pressure spring using adjusting screw, and reset to
required pressure.
Dismantle pressure–relief valve. Clean internal parts.
Consult factory.
19 Pressure spring not pre–tensioned, or
insufficiently pre–tensioned.
Valve seat leaking.
Turn adjusting screw to right until required operating pressure
is reached.
Rework or replace valve cone and valve housing.
20 Pressure–relief valve knocking. Check overpressure with pressure valve closed. Reset valve.
Opening pressure 10 % above operating pressure.
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