24
unstable;
10. The suction level is too low.
The pump
pressure does not
meet the
performance
parameters
1. The suction valve and discharge
valve are damaged;
2. The piston ring is not tightly
sealed, and severely leaks;
3. Diaphragm is not tightly sealed
or ruptures or the discharge pipe
leaks;
4. The built-in hydraulic safety
valve of the pump or pipeline
safety valve is opened.
1. Replace the valve;
2. Check or replace the piston ring and piston cylinder;
3. Find out and seal the leak point, and replace the
diaphragm;
4. Check and adjust the opening pressure of the safety valve.
The measurement
accuracy of pump
is lower
1. The same as items 4-10 for fault
2
2. Plunger zero point is shifted;
3. The liquid temperature is too
close to its boiling point.
1. Refer to corresponding treatment method;
2. Readjust the zero point of plunger;
3. Reduce the temperature or increase the suction pressure.
The parts are hot
and oil
temperature is too
high
1. There is too much or
insufficient oil in the transmission
box;
2.
2. The moving pairs are poorly
lubricated;
3. The clearance between moving
parts is too narrow due to
excessive compression;
4. The bearing is overheated.
5. The parts are under excessive
pressure.
1. Replace oil and fill oil to a level indicated by the oil level
sight glass;
2. Check the supply of lubricating oil;
3. Appropriately adjust the sliding clearance;
4. Check the lubrication and adjust the clearance.
5. Decrease pressure.
Impact sound is
heard during
operation
1. The moving pairs are severely
worn out;
2. The valve ball is lifted too high;
3. There is air in the medium or
cavitation occurs in the pump
1. Adjust or replace the parts;
2. Adjust and reduce the lift height of valve ball;
3. Empty the air in the medium or increase the diameter of
suction pipe;
