Precautions and purchase process of pressurized circulation pump

To measure the performance of the pump, the power is not the main, but the power of the unit. In the case of an equal lift and equal flow centrifugal pump, the power is small and the power is high, that is to say, the performance is good. The pump has the highest level of centrifugal pump and high head flow and rated head flow. Most pumps on the market are marked with the highest head flow. Some manufacturers' pumps are marked as outrageous, such as the general 90w and 120w copper pump head booster pumps. The standard power is 80w (maximum head 10m) and 120w (maximum head 13m).

In order to obtain good sales, some merchants changed to 100w (the highest lift 12-15 meters) and 150w (the highest lift 15-20 meters), and the traffic is also high. There is also a self-priming pump. The theoretical booster pump suction stroke is 10 meters. Because of the existence of pump NPSH (water vaporization caused by roughness in pump head production), the effective suction stroke of the self-priming pump is 8-8.5 meters. . But in order to attract customers' eyes, these parameters are marked beyond fantasy. Therefore, before purchasing the pump, you should know more about the pump's practical parameters, such as the practice of the lift and the practice flow, to avoid the trouble. When the booster pump is in operation, the flow rate is maximum when the head is zero, and the flow rate is zero when the head is at the highest head. According to the flow and head change of each working point, the working curve of the pump can be drawn, which is the performance characteristic curve of the pump. The selection of the pump should be determined according to the site, such as the length of the pipeline, the size of the pipe, the number of elbows, the capacity of the water heater, the type of water heater, the amount of water discharged from the nozzle, and so on. In particular, the pressure-type electric water heater, because of its special device, must use a pump with a slightly larger amount of water, and a small-flow pump is difficult to function.

Pipe pressurization is not a matter of installing a water pump. There are many factors that cause low water pressure. Typical such as pipe aging, especially galvanized pipe, will gradually rust after many years of use, resulting in water flow reduction caused by pipe blockage; If the degree of elbow is too much, the amount of water will be reduced. The water pressure formed by these factors is low, and the effect is not significant after the pump is installed.

The booster pump has a characteristic that the boosting effect is not significant when the pipe flow cannot keep up with the flow rate of the pump or exceeds the flow rate of the pump. Therefore, before purchasing the water pump, it is necessary to check the low water pressure factor, and the water pump cannot be blindly purchased. To purchase, consult a plumber or find an experienced business consultant. The advantage of a merchant consultant is that if the pump boost is not ambivalent, it can plausibly ask the merchant to exchange or return.