The common failure and treatment method of metering pump
1. The motor cannot be started
Cause of failure:
1. No power supply.
2. One or two phase power failure.
Treatment method:
1. Check the power supply.
2, check the fuse and contactor contact is good.
2. No drainage or insufficient drainage
Cause of failure:
1. The suction pipe is blocked or the suction pipe valve is not opened.
2. Air leakage in the suction pipeline.
3. The suction pipe is too long and there are many sharp turns.
4, suction valve or discharge valve valve surface damage or fall into foreign debris, so that the valve surface sealed
lax
5. Residual air in the diaphragm cavity.
6. Air leakage and oil leakage in the oil filling valve group or diaphragm cavity
7, safety valve, compensation valve
The action is not normal.
8, the oil of the oil filling system has impurities, the valve is padded, and the seal is not strict
9. Serious leakage at the plunger packing.
10. Motor speed is insufficient or unstable.
11. The suction liquid level is too low.
Treatment method:
1, check the suction pipe, filter, open the valve.
2. Seal the air leakage part tightly.
3, thick suction pipe, reduce sharp turns.
4. Check the tightness of the valve, and replace the valve and seat if necessary.
5. Re-fill the oil and discharge the gas.
6. Find out the leakage site and seal it tightly.
7. Readjust.
8. Change the oil to clean
9, adjust the packing gland or replace the new packing.
10. Stabilize the motor speed.
11, adjust the suction liquid level height.
Three, the pump pressure can not reach the performance parameters
Cause of failure:
1. Suction and discharge valves are damaged.
2. Serious leakage at the plunger packing.
3, the diaphragm or discharge pipe joint seal is not strict.
Treatment method:
1. Replace the new valve
2, adjust the packing gland or replace the new packing.
3. Find out the air leakage part and seal it tightly.
Four, the measurement accuracy is reduced
Cause of failure:
1. Same as 4 to 11 in serial number 2.
2, plunger zero deviation.
Treatment method:
1. Same as 4 to 11 in serial number 2.
2. Adjust the zero point of the plunger.
Five, parts overheating
Cause of failure:
1. The oil quantity of the fuel tank of the transmission mechanism is too much or insufficient, and the oil has impurities
2. The lubrication of each motion pair is not good.
3, the packing pressure is too tight.
Treatment method:
1, replace the new oil, so that the oil amount is appropriate.
2. Check and clean the oil holes.
3. Adjust the packing gland.
Six, the pump has impact sound
Cause of failure:
1. Serious wear and tear of each sports pair.
2. The valve lift is too high.
Treatment method:
1. Adjust or replace parts.
2. Adjust the lift height to avoid the lag of the pump
