A self priming pump relies on the high-speed rotation of the impeller to create a low-pressure area inside the pump for pumping water. Therefore, the self priming pump must ensure that its inlet pipe does not leak, that is, that external air cannot enter the inlet pipe. Otherwise, it will not only affect the pumping efficiency, but also cause serious vibration and noise during the operation of the water pump.
In work, if the water pump has insufficient or no water output, the first thing to consider is whether there is air entering the inlet pipe due to sand holes, cracks, or loose joints, and observe it to find the inlet. Some defects are very subtle and difficult to detect with the naked eye, often laborious and time-consuming without any results. Here are several simple and practical methods for checking for air leakage in the pump inlet pipeline.
(1) Oil method: For difficult to identify intake points, a small amount of oil can be applied to the approximate intake area, where the oil is quickly sucked away, which is the intake point.
(2) Duck feather method: Use a piece of duck feather to approach the suspected intake while the water pump is running, and observe the movement of the duck feather. Similarly, lit cigarettes can be operated in this way. Use the direction of movement of duck fluff and smoke to assist in searching.