As a user, due to the limited professional knowledge of the pump, it is difficult to decide, the best way is to consult the pump experts. If you really no one advice, may wish to consult some of the older pump users, especially those who are close to their own conditions, to buy these users trustworthy, reliable and more mature pump, after all, a wise choice. At the same time, should be based on local power supply situation to decide with single-phase pump or three-phase pump. First, the choice of standardized pump (A) What is the standard pump Standard pump is the country according to the requirements of ISO, developed and implemented the latest models of pumps. Its main features are small size, light weight, excellent performance, easy operation, long life, low energy consumption. It represents the latest trend of the current pump industry. (B) How to choose the pump When the user selects the pump, it is best to the agricultural machinery department approved point of sale, we must recognize the manufacturer. It is recommended to give priority to the purchase of water-filled submersible pumps, and to see the brand and pump quality certificate. Do not buy "three no" (that is, no manufacturer, no production date, no production license) pump, otherwise there is a problem, the user will do nothing. Non-use period, the pump should be promptly removed from the water, and empty the pump water, especially in the cold winter. Then place it in a dry place, conditional users can also apply butter in the key parts of the pump, add lubricant to the bearings to prevent corrosion of parts. In addition, the non-use of the pump, not the longer the better. If you do not use for a long time, not only easy to rust parts, but also reduce the pump life pump. Second, choose to meet the lift requirements of the pump (A) the pump lift choice The so-called head lift is the required lift, rather than lifting the water level, it is clear that the selection of pumps is particularly important. Pump lift about 1.15 to 1.20 times the height of the lift. If a water source to the water vertical height of 20 meters, its required lift is about 23 to 24 meters. Select the pump should make the best lift on the pump nameplate and the required head close, in this case, the highest efficiency of the pump, the use of more economical. However, it is not absolutely necessary that the pump should be absolutely energy-efficient. As long as the average deviation does not exceed 20%, the pump can work under more energy-efficient conditions. (B) how much the nameplate lift as good Select the nameplate lift is far less than the required head of a pump, often can not meet the user's wishes, even if it can pumping water, the water will be pitifully small, or even become a Useless "free pump." Whether to buy the pump lift the higher the better? actually not. High-lift pump for low lift, there will be excessive flow, resulting in motor overload, if the long run, the motor temperature, the winding insulation will gradually aging, or even burn the motor. Third, select the appropriate flow pump pump flow, that is, the amount of water generally not too large election, otherwise, will increase the cost of purchasing a pump. Specific issues should be specific analysis, such as users own draft self-priming pump, the flow should be selected smaller; such as user irrigation submersible pump, you can choose the appropriate flow larger. Fourth, the use of several issues should pay attention to correctly grasp the use of the pump is to extend the life and reduce economic losses an important factor. (A) for the submersible pump should be done before starting to make some necessary checks: the rotation of the pump shaft is normal, with or without stuck phenomenon; impeller position is normal; cable and cable plug without rupture, abrasions and broken phenomenon . Operation should pay attention to observe the voltage changes, the general control of the rated voltage within Â± 5%. In addition, the location of the pump in the water is very important, should be selected as much as possible in the water, silt-free, good water quality, vertical suspension in the water, not allowed to cross, so as not to fall into the mud or suspended matter blocked by the pump inlet, and Lead to sharp drop in water or even pumping to the water. (B) For the self-priming pump should be placed in a well-ventilated place to run, in order to facilitate rapid cooling, reduce the motor temperature. Otherwise, prolonged operation, easy to burn the motor. If a farmer is using a self-priming pump, the motor is overheated and the coil burned out because the plastic film covering the motor is not removed. In addition, before starting, be sure to check the pump body of water, otherwise, not only affect the self-priming performance, but also easy to burn shaft seal components. Under normal circumstances, the pump should start 3 to 5 minutes after the water, or should immediately stop checking. (C) pump maintenance When the pump fails, should not disassemble yourself. Because of their demolition, I do not know where the fault is caused by blindly dismantling a pass; Second, there is no special tools and often damage the original parts intact. The best way is to have the experience, the maintenance of scale maintenance, and timely replacement of "over age" parts and some wearing parts. Under normal circumstances, the pump should be repaired once every six months, to eliminate "sick" work. (D) of the non-use of small pumps stored in the selection and use and attention issues In recent years, China's social security of agricultural pumps have increased substantially, especially submersible pumps, self-priming pumps, represented by small agricultural pumps, due to low prices , Easy to operate and other advantages favored by the majority of users. However, due to the large number of manufacturers of small pumps, pump technology strengths and weaknesses, resulting in poor quality of the pump. Coupled with the operation, improper use and other factors, so many users have a new set of troubles, or even a lot of economic losses. According to statistics, at present, half of the annual production of agricultural pumps in China is used to replace waste pumps. Therefore, how to choose a long-lasting, pleasing pump and how to extend the life of the pump has become a great concern to the majority of users.