DL vertical multi-stage pump fault solution:
Fault phenomenon
Possible causes
Method of exclusion
1, the pump does not water
The inlet valve is not open, the inlet and outlet pipes are blocked, and the impeller is blocked
The motor runs in the wrong direction and the motor lacks a slow phase
Suction pipe leak
The pump is not filled with liquid and there is air in the pump chamber
Insufficient water supply for import, high suction range, leak at bottom valve
Pipeline resistance is too large, improper pump selection
Check to remove obstructions
Adjust motor steering, tighten motor wiring
Tighten the sealing surfaces and eliminate air
Open the pump cover or open the exhaust valve, exhaust air
Shutdown check, adjustment
Reduce pipeline bends and reselect pumps
2, insufficient water pump flow
First press 1 reason check
Pipes, pump runners or impellers partially blocked, scale deposits...
Low voltage
Impeller wear
Press 1 to exclude
Remove obstructions and readjust valve opening
Regulator
Replace the impeller
3, the power is too large
Use more than rated flow
Suction lift is too high
Pump bearing wear
Adjust the flow, close the small outlet valve
reduce
Replace bearing
4, noise vibration
Unstable pipeline support
Liquid mixed with gas
Cavitation
Bearing damage
Motor overload operation
Steady pipeline
Increase suction pressure, exhaust
Reduce vacuum
Replace bearing
Adjust by 5
5, motor heating
Excessive traffic, overload operation
Local friction
Damaged motor bearings
Insufficient voltage
Small outlet valve
Exclusion
Replace bearing
Regulator
6, leaking water pump
Mechanical seal wear
The pump body has sand holes or cracks
The sealing surface is uneven
Loose mounting bolts
replace
Welding or replacement
Dressing
Fastening
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