When the multistage pump draws water from the pool, if it adopts the self irrigating water absorption way, it can make the suction pipe filled with water all the time. When the pump starts, it saves time of irrigation and exhaust, and it can be quickly put into operation, which improves the automation and reliability of the pump start-up.

The pool is usually set outside the building and buried under the ground. As a result, the working level of the pool is lower than the axis of the pump, and the water pump can not achieve self irrigated water absorption. At this time, the following ways can be used to solve this problem.

The first way is installed at the end of the tube suction end of the valve in the pump suction. Suction end of the valve is actually a check valve, it can only guarantee the flow by the pool into the suction tube can not turn the clock back, so if the suction pipe full of water, despite the elevation axis pump the water level above the pool, but because the end suction the role of valve, suction tube into the pool water will not enable the suction tube has been filled with water to ensure the pump can automatically and quickly start. The reliability of this method by absorbing effect, the quality of the suction end of the valve is not tightly closed, for example, Water Leakage, suction tube will gradually shed the water pool, a long time, no water suction pipe, leading to still need artificial irrigation pump start. The following water absorption can be used to make up for this deficiency.

The second way is to use other water sources to replenishing water. It is the way in the first absorbent based on the front check valve in the pump outlet pipe to install a pipe and the pipe connected to the outside of the municipal water supply or other external sources, to pump water pipe water supplement valve left out of the water, the water pipe filled with water. The reliability of this way of water absorption is affected by outdoor water sources. When the outdoor water sources are left for a long time, the water in the suction pipe may leak, so it is necessary to irrigate water when the pump starts.

The third way is to improve the second types of water absorption, using the roof water tank to the water pump water intake pipe. This way is not affected by the outdoor water supply. It has high reliability and is suitable for buildings with roof tanks. For buildings without roof tanks, a small water tank can be set up in the pump room to replenishment water into the pump suction pipe.

The fourth way is to set up the water suction tank before the pump. This way is needed in a suction tank set the pump suction pipe, water pump in the first operation, artificial internal tank filled with water, the first time after stopping operation, because the water suction tank pipe tube is higher than the height of the water height, although the pool water level is lower than the tank water level, water tank can't go back, into the pool, so the water absorption can be stored, and because the water tank outlet pipe (i.e. pump suction pipe) tube height is lower than the height of the water, so it can ensure the pump suction tube filled with water, and then after the pump is running, the water tank is pumped away, there is negative pressure the tank, the water in the pool under the action of atmospheric pressure added to the water tank through the suction tank inside the pool have continued into the water pump, the output stream is. The water absorption mode is safe and reliable, but it needs to set up the suction tank. The larger the volume of the suction pipe is, the larger the volume of the suction tank will not only increase the cost, but also occupy a certain space in the pump house.

The fifth way is to set up the vacuum pump on the suction line of the pump. Before the pump starts, the vacuum pump starts first, so that the pump suction pipe is filled with water first, so as to ensure the pump to start automatically and quickly. This water absorption mode needs a complete automatic control system to ensure that the vacuum pump starts before the pump, and the cost is high. The reliability is affected by the automatic control system.

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