This problem encountered several times, written today, hoping to buy water pumps and pumps have inspiration. General customers need the pump will be directly from the pump manufacturers to buy or through the dealer to buy water pumps. But often in the first pass there is a problem, customers in the selection, not according to the actual situation to choose. For example, the actual required lift less than 20 meters, but he will choose the type of pump head more than 50 meters. Because in his opinion, I choose to lift the big point of insurance ah, if the election is small, the water can not fight, that is his problem. And the actual situation? Pump working range is a curve, but also has a normal working range, if it is beyond this range, then the pump is prone to problems during use, and reduce the pump life. Therefore, the general pump manufacturers will print and selection manual printed "please customers before buying, providing the use of environmental conditions and the actual flow required, head and other parameters." In particular, the head of the problem, if the actual use of the pump head than the nominal lift is too low, there will be an increase in the pump current, speed and pump load drop too heavy; if the actual use of the pump head than the rated height much higher, Then water can not hit. So when the selection, if you do not understand, it is best to communicate with the sales staff to ensure that the selected model can meet the actual needs. Last month, an old customer set several deep-well pumps and called me this month saying that the pump had stopped working for less than 30 minutes (the pump and control cabinet were connected). Later, after communicating with the client, he found that he actually needed a lift of about 60 meters, but at that time he chose a 100-meter pump. OMG ~~ again this problem! Customers do not understand, think I am joking, shirk its responsibility. The actual situation I have already said above is very clear. Things are very negative, the pump is, the right is the best. Through these lessons, we will communicate with our customers in the future so that these troubles will not arise.