What are the troubleshooting methods for fountain pumps?

- 2021-09-22-

1. The fountain pump does not rotate when starting. Reasons: The packing is too tight or the impeller and the pump body are jammed and blocked by debris; the pump shaft, bearing, and leakage ring are rusted; the pump shaft is severely bent. Remedy: loosen the packing, dredge the water channel: disassemble the pump body to remove debris or rust; correct the bent shaft or replace the pump shaft with a new one.

2. The fountain pump does not output water after starting. Reasons: There is air in the pump or gas in the inlet pipe; the bottom valve is not closed tightly and the filling is not full, the vacuum pump packing is seriously leaking; the gate valve or the flapping door is not tightly closed. Remedy: remove debris, replace damaged rubber pads, change the direction of the valve; press tightly or replace with new packing, close the gate valve or tap the door; increase the amount of water filling, until there is no air bubble at the bleed screw plug; replace it with Cracked pipe water; reduce the head and press the nozzle of the pump into the water 0.5 meters.

3. Reasons for insufficient flow: the actual head of the water pump exceeds the allowable head; the speed is not matched or the belt is slipping, or the speed is low; the blade installation angle of the axial flow pump is too small; the suction lift is too high; the bottom valve, pipeline and impeller are partially blocked or the impeller is defective ; The outlet pipe is leaking seriously. Elimination method: reduce the head, restore the rated speed, remove the belt dirt and adjust the belt tightness; adjust the blade angle, reduce the installation position of the water pump; tighten the gland, seal the leaking part of the water pump, press the packing or replace the packing; remove the blockage, Replace the impeller; replace the leak ring to block the leak.

4. The flow rate changes from large to small. Reasons: The filter screen or the bell mouth is gradually blocked by debris; the dynamic water level is reduced, and the water inlet pipe is not submerged in depth enough. Elimination method: remove debris and increase the depth of water in the bottom valve.

5. The water flow is interrupted during operation. Reasons: there is debris in the pipeline or water inlet; the packing is worn, loose, and the water seal pipe is blocked; the impeller is broken or loose; the moving water level drops sharply. Remedy: clear the blockage, replace the packing, dredge the water pipe groove, install the water seal ring correctly; tighten or replace the impeller; lower the installation position of the water pump, or restart the machine after the water level rises.

6. The power consumption is too large. Reasons: the speed is too high; the pump shaft is bent; the blades are surrounded by debris; the head is too high. Remedy: adjust the appropriate speed; correct the pump shaft; remove debris; try to reduce the head.