The first method is to install a suction bottom valve at the end of the suction pipe of the self-priming sewage pump. The suction bottom valve is actually a check valve that ensures that water can only enter the suction pipe from the pool and cannot flow back. Therefore, if the suction pipe is filled with water, although the pump axis elevation is higher than the working water level of the pool, due to the action of the suction bottom valve, the water in the suction pipe will not flow into the pool, which can keep the suction pipe full of water and ensure that the pump can start automatically and quickly. The reliability of this water suction method is affected by the quality of the water suction bottom valve. For example, if it is not tightly closed or leaks, the water in the suction pipe will slowly flow into the pool. Over time, there will be no water in the suction pipe, resulting in the need for manual water filling when the water pump is started.
Secondly, the self-priming sewage pump reduces the bends, drop height, and horizontal distance of the inlet pipeline.
Thirdly, the self-priming sewage pump is equipped with a pre pump suction tank. This method requires setting up a suction tank on the suction pipe of the water pump. Before the first operation of the water pump, the tank should be manually filled with water. After the first operation stops, because the height of the inlet pipe of the suction tank is higher than the height of the water surface in the pipe, although the height of the water surface in the pool is lower than that in the tank, the water in the tank will not flow back and enter the pool. Therefore, the suction tank can store a certain amount of water. Also, because the height of the outlet pipe of the suction tank (i.e. the suction pipe of the water pump) is lower than the height of the water surface in the pipe, it can ensure that the suction pipe of the water pump is filled with water. In the future, when the water pump runs again, the water in the tank is pumped away by the water pump, and negative pressure appears in the tank. The water in the pool is Inside the water tank of the suction tank.
Fourthly, a vacuum pump is installed on the suction pipe of the self-priming sewage pump. Before starting the water pump, the vacuum pump is first started to fill the suction pipe with water, ensuring that the water pump starts automatically and quickly. This water absorption method requires a complete automatic control system to ensure normal operation.
