Fault phenomenon
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Possible causes
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Exclusion method
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a. Suction height exceeds rated value
b. Air leakage in suction pipe
c. Wrong direction of rotation
d. Suction pipe blocked or valve closed
e. The safety valve is stuck or damaged
f. Liquid temperature is low and viscosity is increased
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a. Increase suction level
b. Check the joints and seal them with sealing materials
c. Correct the direction indicated by the pump
d. Check whether the pipe is blocked and the valve is open
e. Remove the safety valve, clean and grind the valve hole with fine
sand, and use it to match
f. Preheat liquid or reduce discharge pressure
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a. Wear of sealing ring
b. Packing wear
c. Mechanical seal wear or scratch and other defects
d. Mechanical seal spring failure
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a. Replace the sealing ring
b. Adjust the tightness of packing gland and replace or supplement packing
c. Replace or regrind
d.Replacement
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b. The liquid level of suction pipe is shallow
c. Air entering the pipe
d. The discharge pipe resistance is too high
e. Serious wear of gear bearing or side plate
f. The viscosity of the inhaled liquid is too high
g.Suction height exceeds rated value
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a. Eliminating dirt on the filter screen of gear oil pump
b. The suction pipe extends below the liquid level
c. Check the connections and make them sealed
d. Check whether the discharge pipe and valve are blocked
e. Remove, clean and repair defects or
replace
f. Heating, viscosity reduction or treatment
g. Reduce the height of oil absorption and shorten the length of oil suction
pipe |